parse_url

[If you haven't yet] been able to find a simple conversion back to string from a parsed url, here's an example:

<?php

$url = 'http://usr:pss@example.com:81/mypath/myfile.html?a=b&b[]=2&b[]=3#myfragment';
if ($url === unparse_url(parse_url($url))) {
  print "YES, they match!\n";
}

function unparse_url($parsed_url) {
  $scheme   = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
  $host     = isset($parsed_url['host']) ? $parsed_url['host'] : '';
  $port     = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
  $user     = isset($parsed_url['user']) ? $parsed_url['user'] : '';
  $pass     = isset($parsed_url['pass']) ? ':' . $parsed_url['pass']  : '';
  $pass     = ($user || $pass) ? "$pass@" : '';
  $path     = isset($parsed_url['path']) ? $parsed_url['path'] : '';
  $query    = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
  $fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
  return "$scheme$user$pass$host$port$path$query$fragment";
}

?>

Here is utf-8 compatible parse_url() replacement function based on "laszlo dot janszky at gmail dot com" work. Original incorrectly handled URLs with user:pass. Also made PHP 5.5 compatible (got rid of now deprecated regex /e modifier).<?php    /**     * UTF-8 aware parse_url() replacement.     *      * @return array     */    function mb_parse_url($url)    {        $enc_url = preg_replace_callback(            '%[^:/@?&=#]+%usD',            function ($matches)            {                return urlencode($matches[0]);            },            $url        );                $parts = parse_url($enc_url);                if($parts === false)        {            throw new \InvalidArgumentException('Malformed URL: ' . $url);        }                foreach($parts as $name => $value)        {            $parts[$name] = urldecode($value);        }                return $parts;    }?>

It may be worth reminding that the value of the #fragment never gets sent to the server.  Anchors processing is exclusively client-side.

URL's in the query string of a relative URL will cause a problemfails:/page.php?foo=bar&url=http://www.example.comparses:http://www.foo.com/page.php?foo=bar&url=http://www.example.com

Here's a function which implements resolving a relative URL according to RFC 2396 section 5.2. No doubt there are more efficient implementations, but this one tries to remain close to the standard for clarity. It relies on a function called "unparse_url" to implement section 7, left as an exercise for the reader (or you can substitute the "glue_url" function posted earlier).<?php/** * Resolve a URL relative to a base path. This happens to work with POSIX * filenames as well. This is based on RFC 2396 section 5.2. */function resolve_url($base, $url) {        if (!strlen($base)) return $url;        // Step 2        if (!strlen($url)) return $base;        // Step 3        if (preg_match('!^[a-z]+:!i', $url)) return $url;        $base = parse_url($base);        if ($url{0} == "#") {                // Step 2 (fragment)                $base['fragment'] = substr($url, 1);                return unparse_url($base);        }        unset($base['fragment']);        unset($base['query']);        if (substr($url, 0, 2) == "//") {                // Step 4                return unparse_url(array(                        'scheme'=>$base['scheme'],                        'path'=>$url,                ));        } else if ($url{0} == "/") {                // Step 5                $base['path'] = $url;        } else {                // Step 6                $path = explode('/', $base['path']);                $url_path = explode('/', $url);                // Step 6a: drop file from base                array_pop($path);                // Step 6b, 6c, 6e: append url while removing "." and ".." from                // the directory portion                $end = array_pop($url_path);                foreach ($url_path as $segment) {                        if ($segment == '.') {                                // skip                        } else if ($segment == '..' && $path && $path[sizeof($path)-1] != '..') {                                array_pop($path);                        } else {                                $path[] = $segment;                        }                }                // Step 6d, 6f: remove "." and ".." from file portion                if ($end == '.') {                        $path[] = '';                } else if ($end == '..' && $path && $path[sizeof($path)-1] != '..') {                        $path[sizeof($path)-1] = '';                } else {                        $path[] = $end;                }                // Step 6h                $base['path'] = join('/', $path);        }        // Step 7        return unparse_url($base);}?>

I was writing unit tests and needed to cause this function to kick out an error and return FALSE in order to test a specific execution path. If anyone else needs to force a failure, the following inputs will work:

<?php
parse_url("http:///example.com");
parse_url("http://:80");
parse_url("http://user@:80");
?>

Based on the idea of "jbr at ya-right dot com" have I been working on a new function to parse the url:<?phpfunction parseUrl($url) {    $r  = "^(?:(?P<scheme>\w+)://)?";    $r .= "(?:(?P<login>\w+):(?P<pass>\w+)@)?";    $r .= "(?P<host>(?:(?P<subdomain>[\w\.]+)\.)?" . "(?P<domain>\w+\.(?P<extension>\w+)))";    $r .= "(?::(?P<port>\d+))?";    $r .= "(?P<path>[\w/]*/(?P<file>\w+(?:\.\w+)?)?)?";    $r .= "(?:\?(?P<arg>[\w=&]+))?";    $r .= "(?:#(?P<anchor>\w+))?";    $r = "!$r!";                                                // Delimiters        preg_match ( $r, $url, $out );        return $out;}print_r ( parseUrl ( 'me:you@sub.site.org:29000/pear/validate.html?happy=me&sad=you#url' ) );?>This returns:Array(    [0] => me:you@sub.site.org:29000/pear/validate.html?happy=me&sad=you#url    [scheme] =>     [1] =>     [login] => me    [2] => me    [pass] => you    [3] => you    [host] => sub.site.org    [4] => sub.site.org    [subdomain] => sub    [5] => sub    [domain] => site.org    [6] => site.org    [extension] => org    [7] => org    [port] => 29000    [8] => 29000    [path] => /pear/validate.html    [9] => /pear/validate.html    [file] => validate.html    [10] => validate.html    [arg] => happy=me&sad=you    [11] => happy=me&sad=you    [anchor] => url    [12] => url)So both named and numbered array keys are possible.It's quite advanced, but I think it works in any case... Let me know if it doesn't...

Unfortunately parse_url() DO NOT parse correctly urls without scheme or '//'. For example 'www.xyz.com' is consider as path not host:Code:<?phpvar_dump(parse_url('www.xyz.com'));?>Output:array(1) {["path"]=>string(10) "www.xyz.com"}To get better output change url to:'//www.xyz.com' or 'http://www.xyz.com'

UTF-8 aware parse_url() replacement.

I've realized that even though UTF-8 characters are not allowed in URL's, I have to work with a lot of them and parse_url() will break.

Based largely on the work of "mallluhuct at gmail dot com", I added parse_url() compatible "named values" which makes the array values a lot easier to work with (instead of just numbers). I also implemented detection of port, username/password and a back-reference to better detect URL's like this: //en.wikipedia.com
... which, although is technically an invalid URL, it's used extensively on sites like wikipedia in the href of anchor tags where it's valid in browsers (one of the types of URL's you have to support when crawling pages). This will be accurately detected as the host name instead of "path" as in all other examples.

I will submit my complete function (instead of just the RegExp) which is an almost "drop-in" replacement for parse_url(). It returns a cleaned up array (or false) with values compatible with parse_url(). I could have told the preg_match() not to store the unused extra values, but it would complicate the RegExp and make it more difficult to read, understand and extend. The key to detecting UTF-8 characters is the use of the "u" parameter in preg_match().

<?php
function parse_utf8_url($url)
{
    static $keys = array('scheme'=>0,'user'=>0,'pass'=>0,'host'=>0,'port'=>0,'path'=>0,'query'=>0,'fragment'=>0);
    if (is_string($url) && preg_match(
            '~^((?P<scheme>[^:/?#]+):(//))?((\\3|//)?(?:(?P<user>[^:]+):(?P<pass>[^@]+)@)?(?P<host>[^/?:#]*))(:(?P<port>\\d+))?' .
            '(?P<path>[^?#]*)(\\?(?P<query>[^#]*))?(#(?P<fragment>.*))?~u', $url, $matches))
    {
        foreach ($matches as $key => $value)
            if (!isset($keys[$key]) || empty($value))
                unset($matches[$key]);
        return $matches;
    }
    return false;
}
?>

UTF-8 URL's can/should be "normalized" after extraction with this function.

Using a double slash ('//') in a url will be regarded as unparseble string and will return NULL<?php$result = parse_url('http://api.example.com//resource');// $result = null?>Tested with PHP 8.1.27

I have coded a function which converts relative URL to absolute URL for a project of mine. Considering I could not find it elsewhere, I figured I would post it here.The following function takes in 2 parameters, the first parameter is the URL you want to convert from relative to absolute, and the second parameter is a sample of the absolute URL.Currently it does not resolve '../' in the URL, only because I do not need it. Most webservers will resolve this for you. If you want it to resolve the '../' in the path, it just takes minor modifications.<?phpfunction relativeToAbsolute($inurl, $absolute) {    // Get all parts so not getting them multiple times :)    $absolute_parts = parse_url($absolute);        // Test if URL is already absolute (contains host, or begins with '/')    if ( (strpos($inurl, $absolute_parts['host']) == false) ) {        // Define $tmpurlprefix to prevent errors below        $tmpurlprefix = "";        // Formulate URL prefix    (SCHEME)                            if (!(empty($absolute_parts['scheme']))) {             // Add scheme to tmpurlprefix            $tmpurlprefix .= $absolute_parts['scheme'] . "://";         }        // Formulate URL prefix (USER, PASS)            if ((!(empty($absolute_parts['user']))) and (!(empty($absolute_parts['pass'])))) {             // Add user:port to tmpurlprefix            $tmpurlprefix .= $absolute_parts['user'] . ":" . $absolute_parts['pass'] . "@";            }        // Formulate URL prefix    (HOST, PORT)            if (!(empty($absolute_parts['host']))) {             // Add host to tmpurlprefix            $tmpurlprefix .= $absolute_parts['host'];            // Check for a port, add if exists            if (!(empty($absolute_parts['port']))) {                // Add port to tmpurlprefix                $tmpurlprefix .= ":" . $absolute_parts['port'];            }         }        // Formulate URL prefix    (PATH) and only add it if the path to image does not include ./            if ( (!(empty($absolute_parts['path']))) and (substr($inurl, 0, 1) != '/') ) {             // Get path parts            $path_parts = pathinfo($absolute_parts['path']);            // Add path to tmpurlprefix            $tmpurlprefix .= $path_parts['dirname'];            $tmpurlprefix .= "/";         }        else {                $tmpurlprefix .= "/";            }            // Lets remove the '/'        if (substr($inurl, 0, 1) == '/') { $inurl = substr($inurl, 1); }            // Lets remove the './'        if (substr($inurl, 0, 2) == './') { $inurl = substr($inurl, 2); }            return $tmpurlprefix . $inurl;    }        else {        // Path is already absolute. Return it :)        return $inurl;    }}// Define a sample absolute  URL$absolute = "http://" . "user:pass@example.com:8080/path/to/index.html"; // Just evading php.net spam filter, not sure how example.com is spam.../* EXAMPLE 1 */echo relativeToAbsolute($absolute, $absolute) . "\n";/* EXAMPLE 2 */echo relativeToAbsolute("img.gif", $absolute) . "\n";/* EXAMPLE 3 */echo relativeToAbsolute("/img.gif", $absolute) . "\n"; /* EXAMPLE 4 */echo relativeToAbsolute("./img.gif", $absolute) . "\n";/* EXAMPLE 5 */echo relativeToAbsolute("../img.gif", $absolute) . "\n";/* EXAMPLE 6 */echo relativeToAbsolute("images/img.gif", $absolute) . "\n";/* EXAMPLE 7 */echo relativeToAbsolute("/images/img.gif", $absolute) . "\n";/* EXAMPLE 8 */echo relativeToAbsolute("./images/img.gif", $absolute) . "\n";/* EXAMPLE 9 */echo relativeToAbsolute("../images/img.gif", $absolute) . "\n";?>OUTPUTS:http :// user:pass@example.com:8080/path/to/index.htmlhttp :// user:pass@example.com:8080/path/to/img.gifhttp :// user:pass@example.com:8080/img.gifhttp :// user:pass@example.com:8080/path/to/img.gifhttp :// user:pass@example.com:8080/path/to/../img.gifhttp :// user:pass@example.com:8080/path/to/images/img.gifhttp :// user:pass@example.com:8080/images/img.gifhttp :// user:pass@example.com:8080/path/to/images/img.gifhttp :// user:pass@example.com:8080/path/to/../images/img.gifSorry if the above code is not your style, or if you see it as "messy" or you think there is a better way to do it. I removed as much of the white space as possible.Improvements are welcome :)

There's a quirk where this function will return the host as the "path" if there is a leading space.<?php$url = ' https://foobar.com:80/mypath/myfile.php';print_r(parse_url($url));/*Array(    [path] =>  https://foobar.com:80/mypath/myfile.php)*/print_r(trim(parse_url($url)));/*Array(    [scheme] => https    [host] => foobar.com    [port] => 80    [path] => /mypath/myfile.php)*/?>

parse_url doesn't works if the protocol doesn't specified. This seems like sandard, even the youtube doesn't gives the protocol name when generates code for embedding which have a look like "//youtube.com/etc".So, to avoid bug, you must always check, whether the provided url has the protocol, and if not (starts with 2 slashes) -- add the "http:" prefix.

There is a change in PHP 7 (I noticed it in 7.1 upgrading from 5.3) where if the password portion has an octothorpe (#) in it, parsing fails in 7.1, whereas it succeeds in 5.3.

parse_url() does not parse some obvious errors so I made a complementary functionfunction url_check(string $url){        $sym = null;            $len = strlen($url);        for ($i=0; $i<$len; $i++){            if ($url[$i] == '?'){                if ($sym == '?' || $sym == '&')                    return false;                    $sym = '?';            }elseif ($url[$i] == '&'){                if ($sym === null)                    return false;                    $sym = '&';            }         }        return true;    }}

Here's a good way to using parse_url () gets the youtube link.This function I used in many works:<?phpfunction youtube($url, $width=560, $height=315, $fullscreen=true){    parse_str( parse_url( $url, PHP_URL_QUERY ), $my_array_of_vars );    $youtube= '<iframe allowtransparency="true" scrolling="no" width="'.$width.'" height="'.$height.'" src="//www.youtube.com/embed/'.$my_array_of_vars['v'].'" frameborder="0"'.($fullscreen?' allowfullscreen':NULL).'></iframe>';    return $youtube;}// show youtube on my page$url='http://www.youtube.com/watch?v=yvTd6XxgCBE'; youtube($url, 560, 315, true);?>parse_url () allocates a unique youtube code and  put into iframe link and displayed on your page. The size of the videos choose yourself.Enjoy.

Simple static library that allows easy manipulation of url parameters:<?php    /**     * File provides easy way to manipulate url parameters     * @author Alexander Podgorny     */    class Url {        /**         * Splits url into array of it's pieces as follows:         * [scheme]://[user]:[pass]@[host]/[path]?[query]#[fragment]         * In addition it adds 'query_params' key which contains array of          * url-decoded key-value pairs         *         * @param String $sUrl Url         * @return Array Parsed url pieces         */        public static function explode($sUrl) {            $aUrl = parse_url($sUrl);            $aUrl['query_params'] = array();            $aPairs = explode('&', $aUrl['query']);            DU::show($aPairs);            foreach($aPairs as $sPair) {                if (trim($sPair) == '') { continue; }                list($sKey, $sValue) = explode('=', $sPair);                $aUrl['query_params'][$sKey] = urldecode($sValue);            }            return $aUrl;        }        /**         * Compiles url out of array of it's pieces (returned by explodeUrl)         * 'query' is ignored if 'query_params' is present         *          * @param Array $aUrl Array of url pieces         */        public static function implode($aUrl) {            //[scheme]://[user]:[pass]@[host]/[path]?[query]#[fragment]                        $sQuery = '';                        // Compile query            if (isset($aUrl['query_params']) && is_array($aUrl['query_params'])) {                $aPairs = array();                foreach ($aUrl['query_params'] as $sKey=>$sValue) {                    $aPairs[] = $sKey.'='.urlencode($sValue);                               }                $sQuery = implode('&', $aPairs);                } else {                $sQuery = $aUrl['query'];            }                        // Compile url            $sUrl =                 $aUrl['scheme'] . '://' . (                    isset($aUrl['user']) && $aUrl['user'] != '' && isset($aUrl['pass'])                        ? $aUrl['user'] . ':' . $aUrl['pass'] . '@'                        : ''                ) .                $aUrl['host'] . (                    isset($aUrl['path']) && $aUrl['path'] != ''                       ? $aUrl['path']                       : ''                ) . (                   $sQuery != ''                       ? '?' . $sQuery                       : ''                ) . (                   isset($aUrl['fragment']) && $aUrl['fragment'] != ''                       ? '#' . $aUrl['fragment']                       : ''                );            return $sUrl;        }        /**         * Parses url and returns array of key-value pairs of url params         *         * @param String $sUrl         * @return Array         */        public static function getParams($sUrl) {            $aUrl = self::explode($sUrl);            return $aUrl['query_params'];        }        /**         * Removes existing url params and sets them to those specified in $aParams         *         * @param String $sUrl Url         * @param Array $aParams Array of Key-Value pairs to set url params to         * @return  String Newly compiled url          */        public static function setParams($sUrl, $aParams) {            $aUrl = self::explode($sUrl);            $aUrl['query'] = '';            $aUrl['query_params'] = $aParams;            return self::implode($aUrl);        }        /**         * Updates values of existing url params and/or adds (if not set) those specified in $aParams         *         * @param String $sUrl Url         * @param Array $aParams Array of Key-Value pairs to set url params to         * @return  String Newly compiled url          */        public static function updateParams($sUrl, $aParams) {            $aUrl = self::explode($sUrl);            $aUrl['query'] = '';            $aUrl['query_params'] = array_merge($aUrl['query_params'], $aParams);            return self::implode($aUrl);        }    }?>

Created another parse_url utf-8 compatible function.<?phpfunction mb_parse_url($url) {    $encodedUrl = preg_replace('%[^:/?#&=\.]+%usDe', 'urlencode(\'$0\')', $url);    $components = parse_url($encodedUrl);    foreach ($components as &$component)        $component = urldecode($component);    return $components;}?>

Hello, for some odd reason, parse_url returns the host (ex. example.com) as the path when no scheme is provided in the input url. So I've written a quick function to get the real host:

<?php
function getHost($Address) {
   $parseUrl = parse_url(trim($Address));
   return trim($parseUrl[host] ? $parseUrl[host] : array_shift(explode('/', $parseUrl[path], 2)));
}

getHost("example.com"); // Gives example.com
getHost("http://example.com"); // Gives example.com
getHost("www.example.com"); // Gives www.example.com
getHost("http://example.com/xyz"); // Gives example.com
?>

You could try anything! It gives the host (including the subdomain if exists).

Hope it helped you.

In reply to adrian,Thank you very much for your function. There is a small issue with your relative protocol function. You need to remove the // when making the url the path. Here is the new function.function resolve_url($base, $url) {        if (!strlen($base)) return $url;        // Step 2        if (!strlen($url)) return $base;        // Step 3        if (preg_match('!^[a-z]+:!i', $url)) return $url;        $base = parse_url($base);        if ($url{0} == "#") {                // Step 2 (fragment)                $base['fragment'] = substr($url, 1);                return unparse_url($base);        }        unset($base['fragment']);        unset($base['query']);        if (substr($url, 0, 2) == "//") {                // Step 4                return unparse_url(array(                        'scheme'=>$base['scheme'],                        'path'=>substr($url,2),                ));        } else if ($url{0} == "/") {                // Step 5                $base['path'] = $url;        } else {                // Step 6                $path = explode('/', $base['path']);                $url_path = explode('/', $url);                // Step 6a: drop file from base                array_pop($path);                // Step 6b, 6c, 6e: append url while removing "." and ".." from                // the directory portion                $end = array_pop($url_path);                foreach ($url_path as $segment) {                        if ($segment == '.') {                                // skip                        } else if ($segment == '..' && $path && $path[sizeof($path)-1] != '..') {                                array_pop($path);                        } else {                                $path[] = $segment;                        }                }                // Step 6d, 6f: remove "." and ".." from file portion                if ($end == '.') {                        $path[] = '';                } else if ($end == '..' && $path && $path[sizeof($path)-1] != '..') {                        $path[sizeof($path)-1] = '';                } else {                        $path[] = $end;                }                // Step 6h                $base['path'] = join('/', $path);        }        // Step 7        return unparse_url($base);}

My hamble improvements to the famouse `unparse_url` function by "thomas at gielfeldt dot com":```php    /**     * @param array $parsedUrl -- result of the library `parse_url()` function     *     * @return string     */    function unparseUrl(array $parsedUrl): string    {        // PHP_URL_SCHEME        $scheme = empty($parsedUrl[PHP_URL_SCHEME]) ? '' : (rtrim($parsedUrl['scheme'], ':/') . '://');        $user = empty($parsedUrl[PHP_URL_USER]) ? '' : rtrim($parsedUrl['user'], '@:');        $pass = empty($parsedUrl[PHP_URL_PASS]) ? '' : (':' . trim($parsedUrl['pass'], '@:'));        $pass = !$user ? '' : ($pass . '@');        $host = empty($parsedUrl[PHP_URL_HOST]) ? '' : rtrim($parsedUrl['host'], '/');        $port = empty($parsedUrl[PHP_URL_PORT]) ? '' : (':' . (int)ltrim($parsedUrl['port'], ':'));        $path = empty($parsedUrl[PHP_URL_PATH]) ? '' : ('/' . ltrim($parsedUrl['path'], '/'));        $host = ($host && !$port && !$path) ? $parsedUrl['host'] : $host;        $path = ($path && !$host && !$port) ? $parsedUrl['path'] : $path;        $query = empty($parsedUrl[PHP_URL_QUERY]) ? '' : ('?' . ltrim($parsedUrl['query'], '?'));        $fragment = empty($parsedUrl[PHP_URL_FRAGMENT]) ? '' : ('#' . ltrim($parsedUrl['fragment'], '#'));        return "$scheme$user$pass$host$port$path$query$fragment";    }```

This function will attempt to parse relative URLs but relaying on it can produce unexpected behavior that can cause some hard to track bugs. (The following results are obtained from PHP 5.5.19)Attempting to parse a url like thishttp://example.com/entities/GOA:98/?search=8989157d1f22Correctly produces<?phparray (  'scheme' => 'http',  'host' => 'example.com',  'path' => '/entities/GOA:98/',  'query' => 'search=8989157d1f22',);?>However, Attempting to parse the relative URLentities/GOA:98/?search=8989157d1f22<?phparray (  'host' => 'entities',  'port' => 98,  'path' => '/GOA:98/',  'query' => 'search=8989157d1f22',)?>If I change :98 to :A98 parse_url parses the URL correctly as<?phparray (  'path' => 'entities/GOA:A98/',  'query' => 'search=8989157d1f22',)?>Bottom line, Avoid using parse_url for relative urls unless you have tested the expected input and you know parse_url will handle them well.https://forums.hawacastle.com/

I've been working on a generic class that would make URI parsing / building a little easier.The composer package is here: https://packagist.org/packages/enrise/urihelperAnd the repository is here: https://github.com/Enrise/UriHelperAn example of the usage:<?php$uri = new \Enrise\Uri('http://usr:pss@example.com:81/mypath/myfile.html?a=b&b[]=2&b[]=3#myfragment');echo $uri->getScheme(); // httpecho $uri->getUser(); // usrecho $uri->getPass(); // pssecho $uri->getHost(); // example.comecho $uri->getPort(); // 81echo $uri->getPath(); // /mypath/myfile.htmlecho $uri->getQuery(); // a=b&b[]=2&b[]=3echo $uri->getFragment(); // myfragmentecho $uri->isSchemeless(); // falseecho $uri->isRelative(); // false$uri->setScheme('scheme:child:scheme.VALIDscheme123:');$uri->setPort(null);echo $uri->getUri(); //scheme:child:scheme.VALIDscheme123:usr:pss@example.com/mypath/myfile.html?a=b&b[]=2&b[]=3#myfragment?>

Here's a simple class I made that makes use of this parse_url.I needed a way for a page to retain get parameters but also edit or add onto them. I also had some pages that needed the same GET paramaters so I also added a way to change the path.<?phpclass Paths{    private $url;    public function __construct($url){        $this->url = parse_url($url);    }        public function returnUrl(){        $return = $this->url['path'].'?'.$this->url['query'];        $return = (substr($return,-1) == "&")? substr($return,0,-1) : $return;        $this->resetQuery();        return $return;    }        public function changePath($path){        $this->url['path'] = $path;    }        public function editQuery($get,$value){        $parts = explode("&",$this->url['query']);        $return = "";        foreach($parts as $p){            $paramData = explode("=",$p);            if($paramData[0] == $get){                $paramData[1] = $value;            }            $return .= implode("=",$paramData).'&';                    }                $this->url['query'] = $return;    }        public function addQuery($get,$value){        $part = $get."=".$value;        $and = ($this->url['query'] == "?") ? "" : "&";        $this->url['query'] .= $and.$part;    }        public function checkQuery($get){        $parts = explode("&",$this->url['query']);                    foreach($parts as $p){                $paramData = explode("=",$p);                if($paramData[0] == $get)                    return true;            }            return false;            }        public function buildQuery($get,$value){        if($this->checkQuery($get))            $this->editQuery($get,$value);        else            $this->addQuery($get,$value);            }        public function resetQuery(){        $this->url = parse_url($_SERVER['REQUEST_URI']);    }            }?>Useage:Test.php?foo=1:<?php$path = new Paths($_SERVER['REQUEST_URI']);$path->changePath("/baz.php");$path->buildQuery("foo",2);$path->buildQuery("bar",3);echo $path->returnUrl();?>returns: /baz.php?foo=2&bar=3    Hope this is of some use to someone!

Thanks to xellisx for his parse_query function. I used it in one of my projects and it works well. But it has an error. I fixed the error and improved it a little bit. Here is my version of it:<?php// Originally written by xellisxfunction parse_query($var) {  /**   *  Use this function to parse out the query array element from   *  the output of parse_url().   */  $var  = parse_url($var, PHP_URL_QUERY);  $var  = html_entity_decode($var);  $var  = explode('&', $var);  $arr  = array();  foreach($var as $val)   {    $x          = explode('=', $val);    $arr[$x[0]] = $x[1];   }  unset($val, $x, $var);  return $arr; }?>At the first line there was parse_query($val), I made it $var. It used to return a null array before this fix.I have added the parse_url line. So now the function will only focus in the query part, not the whole URL. This is useful if something like below is done:<?php$my_GET = parse_query($_SERVER['REQUEST_URI']);?>

Some example that determines the URL port. 
When port not specified, it derives it from the scheme.

<?php
function getUrlPort( $urlInfo )
{
    if( isset($urlInfo['port']) ) {
        $port = $urlInfo['port'];
    } else { // no port specified; get default port
        if (isset($urlInfo['scheme']) ) {
            switch( $urlInfo['scheme'] ) {
                case 'http':
                    $port = 80; // default for http
                    break;
                case 'https':
                    $port = 443; // default for https
                    break;
                case 'ftp':
                    $port = 21; // default for ftp
                    break;
                case 'ftps':
                    $port = 990; // default for ftps
                    break;
                default:
                    $port = 0; // error; unsupported scheme
                    break;
            }
        } else {
            $port = 0; // error; unknown scheme
        }
    }
    return $port;
}

$url = "http://nl3.php.net/manual/en/function.parse-url.php";
$urlInfo = parse_url( $url );
$urlPort = getUrlPort( $urlInfo );
if( $urlPort !== 0 ) {
    print 'Found URL port: '.$urlPort;
} else {
    print 'ERROR: Could not find port at URL: '.$url;
}
?>

unset a query var from passed in or current URL:function unsetqueryvar($var, $url=null) {    if (null == $url) $url = $_SERVER['REQUEST_URI'];    //mogrify to list    $url = parse_url($url);    $rq = [];    parse_str($url['query'], $rq);    unset($rq[$var]);    return $url['scheme'].$url['host'].$url['path'].'?'.http_build_query($rq).$url['fragment'];}

@ solenoid: Your code was very helpful, but it fails when the current URL has no query string (it appends '&' instead of '?' before the query).  Below is a fixed version that catches this edge case and corrects it.<?phpfunction modify_url($mod) {     $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];     $query = explode("&", $_SERVER['QUERY_STRING']);    if (!$_SERVER['QUERY_STRING']) {$queryStart = "?";} else {$queryStart = "&";}    // modify/delete data     foreach($query as $q)     {         list($key, $value) = explode("=", $q);         if(array_key_exists($key, $mod))         {             if($mod[$key])             {                 $url = preg_replace('/'.$key.'='.$value.'/', $key.'='.$mod[$key], $url);             }             else             {                 $url = preg_replace('/&?'.$key.'='.$value.'/', '', $url);             }         }     }     // add new data     foreach($mod as $key => $value)     {         if($value && !preg_match('/'.$key.'=/', $url))         {             $url .= $queryStart.$key.'='.$value;         }     }     return $url; } ?>

Here's a piece of code that modifies, replaces or removes the url query. This can typically used in paging situations where there are more parameters than the page.

<?php
function modify_url($mod)
{
    $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    $query = explode("&", $_SERVER['QUERY_STRING']);
    // modify/delete data
    foreach($query as $q)
    {
        list($key, $value) = explode("=", $q);
        if(array_key_exists($key, $mod))
        {
            if($mod[$key])
            {
                $url = preg_replace('/'.$key.'='.$value.'/', $key.'='.$mod[$key], $url);
            }
            else
            {
                $url = preg_replace('/&?'.$key.'='.$value.'/', '', $url);
            }
        }
    }
    // add new data
    foreach($mod as $key => $value)
    {
        if($value && !preg_match('/'.$key.'=/', $url))
        {
            $url .= '&'.$key.'='.$value;
        }
    }
    return $url;
}

// page url: "http://www.example.com/page.php?p=5&show=list&style=23"

$url = modify_url(array('p' => 4, 'show' => 'column'));

// $url = "http://www.example.com/page.php?p=4&show=column&style=23"
?>

<?phpfunction url_parse($url){$sflfdfldf=$url;if(strpos($url,"?")>-1){$a=explode("?",$url,2);$url=$a[0];$query=$a[1];}if(strpos($url,"://")>-1){$scheme=substr($url,0,strpos($url,"//")-1);$url=substr($url,strpos($url,"//")+2,strlen($url));}if(strpos($url,"/")>-1){$a=explode("/",$url,2);$url=$a[0];$path="/".$a[1];}if(strpos($url,":")>-1){$a=explode(":",$url,2);$url=$a[0];$port=$a[1];}$host=$url;$url=null;foreach(array("url","scheme","host","port","path","query") as $var){if(!empty($$var)){$return[$var]=$$var;}}//return array("url"=>$sflfdfldf,"scheme"=>$scheme,"host"=>$host,"port"=>$port,"path"=>$path,"query"=>$query,"a"=>$url);return $return;}?><?php/* Compare two outputs *///mineprint_r(url_parse("http://login.yahoo.com?.src=ym&.intl=gb&.lang=zh-Hans-HK&.done=https://mail.yahoo.com"));//internalprint_r(parse_url("http://login.yahoo.com?.src=ym&.intl=gb&.lang=zh-Hans-HK&.done=https://mail.yahoo.com"));?>

Please consider these tips and cases:1. Handling Fragment Identifiers:parse_url() handles fragment identifiers (#section), but the fragment is not sent to the server and is used client-side only. Be cautious when relying on fragment data, as it might not be available in server-side processing.2. URL Encoding and Decoding Issues:parse_url() does not decode URL-encoded characters in the path. Ensure that encoding and decoding are handled correctly if special characters are involved.For example:$url = 'https://www.primeogroup.com/es/servicios-de-configuraci%C3%B3n-instalaci%C3%B3n-y-an%C3%A1lisis-de-google-analytics/';// /es/servicios-de-configuraci%C3%B3n-instalaci%C3%B3n-y-an%C3%A1lisis-de-google-analytics/$path = parse_url($url, PHP_URL_PATH);// /es/servicios-de-configuración-instalación-y-análisis-de-google-analytics/$decoded_path = urldecode($path);3. Unusual Port Numbers:parse_url() does not handle ports outside the valid range (1-65535) correctly.parse_url will return: bool(false)

While not directly related to the above, I found this page seeking how to access REST style domain.com?key1=value1&key2=value2 type parameters.  After reading the page and comments, want to add this to help others who might find themselves here seeking the same solution.Given:  domain.com?key1=value1&key2=value2 echo $_GET['key2']; // output: 'value2'PHP makes this easier than just about any other language IMO.

I need to parse out the query string from the referrer, so I created this function.

<?php
function parse_query($val)
 {
  /** 
   *  Use this function to parse out the query array element from
   *  the output of parse_url().
   */
  $var  = html_entity_decode($var);
  $var  = explode('&', $var);
  $arr  = array();

  foreach($var as $val)
   {
    $x          = explode('=', $val);
    $arr[$x[0]] = $x[1];
   }
  unset($val, $x, $var);
  return $arr;
 }
?>

This function 'parse_rebuild_url' will parse and reassemble your URL with new values provided by the 'overwrite_parsed_url_array' back together.It is also possible to overwrite the URL components by key name and to merge or overwrite query parameters.<?php    $test_url = 'http://usr:pss@example.com:81/mypath/myfile.html?a=b&b[]=2&b[]=3&z=9#myfragment';    $new_url_01_overwrite_query_params = parse_rebuild_url( $test_url, array(        'host' => 'new-hostname.tld',        'query' => array(            'test' => 'Hello World',            'a'    => array( 'c', 'd' ),            'z'    => 8        ),        'fragment' => 'new-fragment-value'    ), false );    $new_url_02_mergewith_query_params = parse_rebuild_url( $test_url, array(        'query' => array(            'test' => 'Hello World',            'a'    => array( 'c', 'd' ),            'z'     => 8        ),        'fragment' => 'new-fragment-value'    ), true );    function parse_rebuild_url( $url, $overwrite_parsed_url_array, $merge_query_parameters = true ) {        $parsed_url_array = parse_url( $url );        $parsed_url_keys_array = array(            'scheme'        => null,            'abempty'       => isset( $parsed_url_array['scheme'] ) ? '://' : null,            'user'          => null,            'authcolon'     => isset( $parsed_url_array['pass'] ) ? ':' : null,            'pass'          => null,            'authat'        => isset( $parsed_url_array['user'] ) ? '@' : null,            'host'          => null,            'portcolon'     => isset( $parsed_url_array['port'] ) ? ':' : null,            'port'          => null,            'path'          => null,            'param'         => isset( $parsed_url_array['query'] ) ? '?' : null,            'query'         => null,            'hash'          => isset( $parsed_url_array['fragment'] ) ? '#' : null,            'fragment'      => null        );        if ( isset( $parsed_url_array['query'] ) && $merge_query_parameters === true ) {            parse_str( $parsed_url_array['query'], $query_array );            $overwrite_parsed_url_array['query'] = array_merge_recursive( $query_array, $overwrite_parsed_url_array['query'] );        }        $query_parameters = http_build_query( $overwrite_parsed_url_array['query'], null, '&', PHP_QUERY_RFC1738 );        $overwrite_parsed_url_array['query'] = urldecode( preg_replace( '/%5B[0-9]+%5D/simU', '%5B%5D', $query_parameters ) );        $fully_parsed_url_array = array_filter( array_merge( $parsed_url_keys_array, $parsed_url_array, $overwrite_parsed_url_array ) );        return implode( null, $fully_parsed_url_array );    }

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this is my 404 error page is this ok  or it need improvements <?php/** * 404.php * * The template for displaying 404 pages (not found) * * @author    BetterStudio * @package   Publisher * @version   2.0.2 */get_header();// Shows breadcrumbif ( publisher_show_breadcrumb() ) {    Better_Framework()->breadcrumb()->generate( array(        'before'       => '<div class="container bf-breadcrumb-container">',        'after'        => '</div>',        'custom_class' => 'bc-top-style'    ) );}?>    <div class="content-wrap">        <main <?php publisher_attr( 'content', '' ); ?>>            <div class="container layout-1-col layout-no-sidebar">                <div class="row main-section">                    <div class="content-column content-404">                        <div class="row first-row">                            <div class="col-lg-12 text-404-section">                                <p class="text-404 heading-typo">404</p>                            </div>                            <div class="col-lg-12 desc-section">                                <h1 class="title-404"><?php publisher_translation_echo( '404_not_found' ); ?></h1>                                <p><?php publisher_translation_echo( '404_not_found_message' ); ?></p>                                <div class="action-links clearfix">                                    <script type="text/javascript">                                        if (document.referrer) {                                            document.write('<div class="search-action-container"><a href="' + document.referrer + '"><i class="fa fa-angle-double-right"></i> <?php publisher_translation_echo( '404_go_previous_page' ); ?></a></div>');                                        }                                    </script>                                    <div class="search-action-container">                                        <a href="<?php echo esc_url( home_url( '/' ) ); ?>"><i                                                    class="fa fa-angle-double-right"></i> <?php publisher_translation_echo( '404_go_homepage' ); ?>                                        </a>                                    </div>                                </div>                            </div>                        </div><!-- .first-row -->                        <div class="row second-row">                            <div class="col-lg-12">                                <div class="top-line">                                    <?php get_search_form(); ?>                                </div>                            </div>                        </div><!-- .second-row -->                    </div><!-- .content-column -->                </div><!-- .main-section -->            </div> <!-- .layout-1-col -->        </main><!-- main -->    </div><!-- .content-wrap --><?php get_footer(); ?> https://bramg.net

Hello, for some odd reason, parse_url returns the host (ex. example.com) as the path when no scheme is provided in the input url. So I've written a quick function to get the real host:<?phpfunction getHost($Address) {   $parseUrl = parse_url(trim($Address));   return trim($parseUrl[host] ? $parseUrl[host] : array_shift(explode('/', $parseUrl[path], 2)));}getHost("example.com"); // Gives example.comgetHost("http://example.com"); // Gives example.comgetHost("www.example.com"); // Gives www.example.comgetHost("http://example.com/xyz"); // Gives example.com?>You could try anything! It gives the host (including the subdomain if exists).Hope it helped you.https://vb.3dlat.com/

To get the params (url query) as Associative array, use this function: <?php /** * Returns the url query as associative array * * @param    string    query * @return    array    params */ function convertUrlQuery($query) {     $queryParts = explode('&', $query);         $params = array();     foreach ($queryParts as $param) {         $item = explode('=', $param);         $params[$item[0]] = $item[1];     }         return $params; } ?>