get_meta_tags

(PHP 4, PHP 5, PHP 7, PHP 8)

get_meta_tags — ファイル上のすべてのメタタグ情報を配列に展開する

説明

get_meta_tags(string $filename, bool $use_include_path = false): array|false

filename 内の各行をパースし <meta> タグ内の情報を配列として返します。 </head> でパースを終了します。

パラメータ

filename

HTML ファイルへのパスを表す文字列。ローカルファイルのほか URL も指定できます。

例1 get_meta_tags() が何をパースするのか

<meta name="author" content="name">
<meta name="keywords" content="php documentation">
<meta name="DESCRIPTION" content="a php manual">
<meta name="geo.position" content="49.33;-86.59">
</head> <!-- ここでパースを終了します -->

use_include_path

use_include_path を true に指定すると、 include_path ディレクティブの内容にしたがってファイルを探します。これはローカルファイルにのみ有効で、URL の場合は使用できません。

戻り値

パースされたメタタグを含む配列を返します。

name 属性の値が配列のキーとなります。content 属性の値が配列の要素となります。標準の配列関数を利用することでこれらの値に簡単にアクセスすることができます。 name 属性で特別な文字が使われている場合は '_' で代用されます。それ以外は小文字に変換されます。もしも同じ名前のメタタグがある場合には最後のもののみが返されます。

失敗時に false を返します。

例

例2 get_meta_tags() が何を返すのか

<?php
// 上のタグは www.example.com 上のものだと仮定します
$tags = get_meta_tags('http://www.example.com/');

// すべてのキーが小文字であり、. (ピリオド) が _ に
// 置換されていることに注目してください。
echo $tags['author'];       // name
echo $tags['keywords'];     // php documentation
echo $tags['description'];  // a php manual
echo $tags['geo_position']; // 49.33;-86.59
?>

注意

注意:
name 属性がついているメタタグのみがパースの対象となります。クォートは不要です。

参考

htmlentities() - 適用可能な文字を全て HTML エンティティに変換する
urlencode() - 文字列を URL エンコードする

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User Contributed Notes 19 notes

down

bobble bubble ¶

9 years ago

This regex gets meta tags independent of sequence by capturing inside a lookahead.
Further uses the branch reset feature for different quote styles of values.
The pattern can be tested here: https://regex101.com/r/oE4oU9/1

<?PHP

function getMetaTags($str)
{
  $pattern = '
  ~<\s*meta\s

  # using lookahead to capture type to $1
    (?=[^>]*?
    \b(?:name|property|http-equiv)\s*=\s*
    (?|"\s*([^"]*?)\s*"|\'\s*([^\']*?)\s*\'|
    ([^"\'>]*?)(?=\s*/?\s*>|\s\w+\s*=))
  )

  # capture content to $2
  [^>]*?\bcontent\s*=\s*
    (?|"\s*([^"]*?)\s*"|\'\s*([^\']*?)\s*\'|
    ([^"\'>]*?)(?=\s*/?\s*>|\s\w+\s*=))
  [^>]*>

  ~ix';
  
  if(preg_match_all($pattern, $str, $out))
    return array_combine($out[1], $out[2]);
  return array();
}

// usage
$meta_tags = getMetaTags($str);

?>

down

richard dot dern at athaliasoft dot fr ¶

11 years ago

I personally experienced less issues using the DOM functions than regular expressions while trying to fetch meta tags and not using get_meta_tags function (in order to get http-equiv meta tags too).

<?php

$doc = new DOMDocument();
$doc->loadHTML($html);

$xpath = new DOMXPath($doc);

$nodes = $xpath->query('//head/meta');

foreach($nodes as $node) {
    [...]
}

?>

down

jp at webgraphe dot com ¶

21 years ago

If the URL is doing a redirection using the headers (like you would do with PHP function header("Location: URL");), the page has no content (in general). It appears get_meta_tags() doesn't catch that kind of redirection (like cURL would do) and it lead me to a timeout of my script.

I experienced this in a spider I wrote in order to feed my database of all available pages on my site and one link was linking to a page that simply has the following code:

<?php
  header("Location: sections.php?section=home");
  exit();
?>

That made my script hang for a moment and apparently, get_meta_tags() wasn't even able to return me an error.

JP.

down

Ebpo ¶

11 years ago

Be aware that the function looks for the metatags in the whole page. If one of the meta is commented in your code for some reason, it will still be grabed.

down

Anonymous ¶

23 years ago

Tested PHP 4.0.6



get_meta_tags() seems to look only in the beginning of a file, meaning that e.g. if there is a lot of PHP code before the HTML header it will return nothing ...

Tested using get_meta_tags() on local files with about 9000 characters of PHP code before HTML HEADER.



Workaround: if possible move code after header or if not: include a file.

down

richard at pifmagazine dot com ¶

24 years ago

An Important Note about META tags and this function :  if your META tag contains newline "\n"  characters, get_meta_tags() will return a NULL value for that name property.  Removing the newlines from the source META tag corrects the problem.

down

LWC ¶

9 years ago

New version based on mariano at cricava dot com's work with:
1) Support for Meta properties (like Facebook's og tags).
2) Support for Unicode (UTF-8) encoded Meta lines.
3) An option not to convert htmlentities - if you plan to actually use the results and not just display them.

function getUrlData($url, $raw=false) // $raw - enable for raw display
{
    $result = false;
   
    $contents = getUrlContents($url);

    if (isset($contents) && is_string($contents))
    {
        $title = null;
        $metaTags = null;
        $metaProperties = null;
       
        preg_match('/<title>([^>]*)<\/title>/si', $contents, $match );

        if (isset($match) && is_array($match) && count($match) > 0)
        {
            $title = strip_tags($match[1]);
        }
       
        preg_match_all('/<[\s]*meta[\s]*(name|property)="?' . '([^>"]*)"?[\s]*' . 'content="?([^>"]*)"?[\s]*[\/]?[\s]*>/si', $contents, $match);
       
        if (isset($match) && is_array($match) && count($match) == 4)
        {
            $originals = $match[0];
            $names = $match[2];
            $values = $match[3];
           
            if (count($originals) == count($names) && count($names) == count($values))
            {
                $metaTags = array();
                $metaProperties = $metaTags;
                if ($raw) {
                    if (version_compare(PHP_VERSION, '5.4.0') == -1)
                         $flags = ENT_COMPAT;
                    else
                         $flags = ENT_COMPAT | ENT_HTML401;
                }
               
                for ($i=0, $limiti=count($names); $i < $limiti; $i++)
                {
                    if ($match[1][$i] == 'name')
                         $meta_type = 'metaTags';
                    else
                         $meta_type = 'metaProperties';
                    if ($raw)
                        ${$meta_type}[$names[$i]] = array (
                            'html' => htmlentities($originals[$i], $flags, 'UTF-8'),
                            'value' => $values[$i]
                        );
                    else
                        ${$meta_type}[$names[$i]] = array (
                            'html' => $originals[$i],
                            'value' => $values[$i]
                        );
                }
            }
        }
       
        $result = array (
            'title' => $title,
            'metaTags' => $metaTags,
            'metaProperties' => $metaProperties,
        );
    }
   
    return $result;
}

function getUrlContents($url, $maximumRedirections = null, $currentRedirection = 0)
{
    $result = false;
   
    $contents = @file_get_contents($url);
   
    // Check if we need to go somewhere else
   
    if (isset($contents) && is_string($contents))
    {
        preg_match_all('/<[\s]*meta[\s]*http-equiv="?REFRESH"?' . '[\s]*content="?[0-9]*;[\s]*URL[\s]*=[\s]*([^>"]*)"?' . '[\s]*[\/]?[\s]*>/si', $contents, $match);
       
        if (isset($match) && is_array($match) && count($match) == 2 && count($match[1]) == 1)
        {
            if (!isset($maximumRedirections) || $currentRedirection < $maximumRedirections)
            {
                return getUrlContents($match[1][0], $maximumRedirections, ++$currentRedirection);
            }
           
            $result = false;
        }
        else
        {
            $result = $contents;
        }
    }
   
    return $contents;
}
?>

<?php
$result = getUrlData('http://whatever...', true);

echo '<pre>'; print_r($result, true); echo '</pre>';

?>

Output example:

<?php
Array
(
    [title] => The requested page's title
    [metaTags] => Array
        (
            [description] => Array
                (
                    [html] => <meta name="description" content="Something..." />
                    [value] => Something...
                )
        )
    [metaProperties] => Array
        (
            [og:type] => Array
                (
                    [html] => <meta property="og:type" content="article"/>/>
                    [value] => article
                )
        )
)
?>

down

rehfeld ¶

19 years ago

in response to
jp at webgraphe dot com

this function grabs meta tags, not http headers

if you need the headers

<?php

$fp = fopen('http://example.org/somepage.html', 'r');

// the variable $http_response_header magically appears
print_r($http_response_header);

// or
$meta_data = stream_get_meta_data($fp);
print_r($meta_data);

?>

down

mariano at cricava dot com ¶

19 years ago

Based on Michael Knapp's code, and adding some regex, here's a function that will get all meta tags and the title based on a URL. If there's an error, it will return false. Using the function getUrlContents(), also included, it takes care of META REFRESH re-directions, following up to the specified number of redirections. Please note that the regular expressions included were split into strings because php.net was complaining about the line being to long ;)

<?php
function getUrlData($url)
{
    $result = false;
    
    $contents = getUrlContents($url);

    if (isset($contents) && is_string($contents))
    {
        $title = null;
        $metaTags = null;
        
        preg_match('/<title>([^>]*)<\/title>/si', $contents, $match );

        if (isset($match) && is_array($match) && count($match) > 0)
        {
            $title = strip_tags($match[1]);
        }
        
        preg_match_all('/<[\s]*meta[\s]*name="?' . '([^>"]*)"?[\s]*' . 'content="?([^>"]*)"?[\s]*[\/]?[\s]*>/si', $contents, $match);
        
        if (isset($match) && is_array($match) && count($match) == 3)
        {
            $originals = $match[0];
            $names = $match[1];
            $values = $match[2];
            
            if (count($originals) == count($names) && count($names) == count($values))
            {
                $metaTags = array();
                
                for ($i=0, $limiti=count($names); $i < $limiti; $i++)
                {
                    $metaTags[$names[$i]] = array (
                        'html' => htmlentities($originals[$i]),
                        'value' => $values[$i]
                    );
                }
            }
        }
        
        $result = array (
            'title' => $title,
            'metaTags' => $metaTags
        );
    }
    
    return $result;
}

function getUrlContents($url, $maximumRedirections = null, $currentRedirection = 0)
{
    $result = false;
    
    $contents = @file_get_contents($url);
    
    // Check if we need to go somewhere else
    
    if (isset($contents) && is_string($contents))
    {
        preg_match_all('/<[\s]*meta[\s]*http-equiv="?REFRESH"?' . '[\s]*content="?[0-9]*;[\s]*URL[\s]*=[\s]*([^>"]*)"?' . '[\s]*[\/]?[\s]*>/si', $contents, $match);
        
        if (isset($match) && is_array($match) && count($match) == 2 && count($match[1]) == 1)
        {
            if (!isset($maximumRedirections) || $currentRedirection < $maximumRedirections)
            {
                return getUrlContents($match[1][0], $maximumRedirections, ++$currentRedirection);
            }
            
            $result = false;
        }
        else
        {
            $result = $contents;
        }
    }
    
    return $contents;
}
?>

Here's an example of its usage. Check that the included URL has a META REFRESH redirection:

<?php
$result = getUrlData('http://www.marianoiglesias.com.ar/');

echo '<pre>'; print_r($result); echo '</pre>';

?>

For the above code the output would be:

<?php
Array
(
    [title] => Mariano Iglesias: El Eternauta    
    [metaTags] => Array
        (
            [description] => Array
                (
                    [html] => <meta name="description" content="Java, PHP, and some other technological mumble jumble. Also, some real-life stuff as well." />
                    [value] => Java, PHP, and some other technological mumble jumble. Also, some real-life stuff as well.
                )

            [DC.title] => Array
                (
                    [html] => <meta name="DC.title" content="Mariano Iglesias - Weblog" />
                    [value] => Mariano Iglesias - Weblog
                )

            [ICBM] => Array
                (
                    [html] => <meta name="ICBM" content="-34.6017, -58.3956" />
                    [value] => -34.6017, -58.3956
                )

            [geo.position] => Array
                (
                    [html] => <meta name="geo.position" content="-34.6017;-58.3956" />
                    [value] => -34.6017;-58.3956
                )

            [geo.region] => Array
                (
                    [html] => <meta name="geo.region" content="AR-BA">
                    [value] => AR-BA
                )

            [geo.placename] => Array
                (
                    [html] => <meta name="geo.placename" content="Buenos Aires">
                    [value] => Buenos Aires
                )

        )

)
?>

down

roganty at gmail dot com ¶

18 years ago

This is a slight amendment to jimmyxx at gmail dot com function

I tried using the regex displayed in his code, and php threw up a couple of errors

Below is the correct regular expression that works
(Please note that I had to split the regex into strings because php.net was complaining about the line being to long)
<?php
preg_match_all(
   "|<meta[^>]+name=\"([^\"]*)\"[^>]" . "+content=\"([^\"]*)\"[^>]+>|i",
   $html, $out,PREG_PATTERN_ORDER);
?>

The problem was due to the quotes being incorrectly escaped.
I hope this helps anyone who has been having problems with his code

down

tim dot bennett at haveaniceplay dot com ¶

19 years ago

If you want to get the contents of tags other than meta you can use:

<?php

$page = "http://www.mysite.com/apage.php";

    // tags
    $start = '<atag>';
    $end = '<\/atag>';

    // open the file
    $fp = fopen( $page, 'r' );

    $cont = "";

    // read the contents
    while( !feof( $fp ) ) {
        $buf = trim( fgets( $fp, 4096 ) );
        $cont .= $buf;
    }
    
    // get tag contents
    preg_match( "/$start(.*)$end/s", $cont, $match );

    // tag contents
    $contents = $match[ 1 ]; 

?>

down

Michael Knapp ¶

19 years ago

Tim's code is good (thanks Tim), except it won't work very well if the tag is part of a long non-breaking string.

E.g. try getting the title from Google Maps (http://www.google.com/maps).

A better solution is:

<?php 
$title = "";
    
if ($fp = @fopen( $_POST['url'], 'r' )) {

    $cont = "";
    
    // read the contents
    while( !feof( $fp ) ) {
       $buf = trim(fgets( $fp, 4096 )) ;
       $cont .= $buf;
    }

    // get tag contents
    @preg_match( "/<title>([a-z 0-9]*)<\/title>/si", $cont, $match );
    
    // tag contents
    $title = strip_tags(@$match[ 1 ]); 
} 

?>

Note the strip_tags. Another thing to be careful of is to check for ", <, and >. You will need to strip those out if you are posting the output to a form.

Also, it is probably best to use the /i modifier, because some people might code <TITLE> etc...

down

richard at pifmagazine dot com ¶

24 years ago

Something that is not mentioned above and should be : When using get_meta_tags on a remote PHP page the page will be parsed before the meta tags are returned - so you can capture meta tags generated dynamically (by PHP??) on the remote end.



This DOES NOT work the same way when getting meta tags on local file systems.  Local files are not parsed through the web server before returning to get_meta_tags().  If the META tag is hard-coded into the page, you'll be fine - but if it dynamically generated you will not be able to capture it unless you use the full URL when calling your local files.

down

-2

doob_ at gmx dot de ¶

16 years ago

<?php



/*

** Extracts and formats meta tag content 

*/



function get_meta_data($url, $searchkey='') {    

    $data = get_meta_tags($url);    // get the meta data in an array

    foreach($data as $key => $value) {

        if(mb_detect_encoding($value, 'UTF-8, ISO-8859-1', true) != 'ISO-8859-1') {    // check whether the content is UTF-8 or ISO-8859-1

            $value = utf8_decode($value);    // if UTF-8 decode it

        }

        $value = strtr($value, get_html_translation_table(HTML_ENTITIES));    // mask the content

        if($searchkey != '') {    // if only one meta tag is in demand e.g. 'description'

            if($key == $searchkey) {

                $str = $value;    // just return the value

            }

        } else {    // all meta tags

            $pattern = '/ |,/i';    // ' ' or ','

            $array = preg_split($pattern, $value, -1, PREG_SPLIT_NO_EMPTY);    // split it in an array, so we have the count of words            

            $str .= '<p><span style="display:block;color:#000000;font-weight:bold;">' . $key . ' <span style="font-weight:normal;">(' . count($array) . ' words | ' . strlen($value) . ' chars)</span></span>' . $value . '</p>';    // format data with count of words and chars

        }

    }

    return $str;

}



$content .= get_meta_data("http://www.example.com/");

/*

output looks like this:



description (23 words | 167 chars)

SELFHTML 8.1.2 - Die bekannte Dokumentation zu HTML, JavaScript und CGI/Perl - Tutorial und Referenz, mit etlichen Zusatztips zu Design, Grafik, Projektverwaltung usw.



keywords (13 words | 119 chars)

SELFHTML, HTML, Dynamic HTML, JavaScript, CGI, Perl, Grafik, WWW-Seiten, Web-Seiten, Hilfe, Dokumentation, Beschreibung



etc.



*/



$content .= get_meta_data("http://www.example.com/", "description");

/*

output looks like this:



SELFHTML 8.1.2 - Die bekannte Dokumentation zu HTML, JavaScript und CGI/Perl - Tutorial und Referenz, mit etlichen Zusatztips zu Design, Grafik, Projektverwaltung usw.

*/



?>

down

-1

jstel at 126 dot com ¶

15 years ago

this function could get each meta of html content , and stripped all js and css. 



<?php

function get_meta_data($content)

{

    $content = strtolower($content);

    $content = preg_replace("'<style[^>]*>.*</style>'siU",'',$content);  // strip js

    $content = preg_replace("'<script[^>]*>.*</script>'siU",'',$content); // strip css

    $split = explode("\n",$content);

    foreach ($split as $k => $v)

    {

        if (strpos(' '.$v,'<meta')) {

             preg_match_all(

"/<meta[^>]+(http\-equiv|name)=\"([^\"]*)\"[^>]" . "+content=\"([^\"]*)\"[^>]*>/i",

$v, $split_content[],PREG_PATTERN_ORDER);;

        }

    }

    return $split_content;

}

?>

down

-1

Antonio - Malaga ¶

15 years ago

It's not work if meta syntax not have trailing slash.

down

-1

Ben dot Davis at furman dot edu ¶

23 years ago

I have found that for large searches, get_meta_tags is very slow.  I created a large search engine for a website that couldnt use a database and I first tried pulling out the meta tags.  

I have found that it is actually much faster to use eregi to pull out the meta tags.  This code below pulls out the description:



if (eregi ("<meta name=\"description\" content=[^>]*", $contents, $descresult))

                                {

                                    $description = explode("<meta name=\"description\" content=", $descresult[0]);

                                    echo "<font face=\"Arial\" size=2>$description[1]</font>";

                                    

                                }

down

-3

diel at caroes dot be ¶

16 years ago

Quick meta data grabber
[code]
if(get_meta_tags('http://'.$_POST['pagina'])){
        print '<font class="midden">Meta data from http://'.$_POST['pagina'].'</font>';
        $metadata = get_meta_tags('http://'.$_POST['pagina']);
        echo '<table width="100%">';
        print '<tr><td>Meta</td><td>Waarde</td></tr>';
        foreach($metadata as $naam => $waarde){
            echo '<tr><td valign="top">'.$naam.'</td><td>'.$waarde.'</td></tr>';
        }
        print '</table>';
    }else{
        print '
        <div class="red_h">Incorrect</div>
        ';
    }
[/code]

down

-3

jimmyxx at gmail dot com ¶

19 years ago

I used this as part of my mini php search based search engine - it really slowed the whole thing down. I wrote this function to read HTML (just fetch the file or use something like snoopy) and extract the meta data via a simple regex, works a treat and made my crawler much faster:

<?php

function get_meta_data($html) {

    preg_match_all(
    "|<meta[^>]+name=\\"([^\\"]*)\\"[^>]+content=\\"([^\\"]*)\\"[^>]+>|i",  $html, $out,PREG_PATTERN_ORDER);

    for ($i=0;$i < count($out[1]);$i++) {
        // loop through the meta data - add your own tags here if you need
        if (strtolower($out[1][$i]) == "keywords") $meta['keywords'] = $out[2][$i];
        if (strtolower($out[1][$i]) == "description") $meta['description'] = $out[2][$i];
    }

return $meta;    
}

?>

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