curl_exec

Just in case anyone is looking for a a couple of simple functions [to help automate cURL processes for POST and GET queries] I thought I'd post these.

<?php

/**
 * Send a POST requst using cURL
 * @param string $url to request
 * @param array $post values to send
 * @param array $options for cURL
 * @return string
 */
function curl_post($url, array $post = NULL, array $options = array())
{
    $defaults = array(
        CURLOPT_POST => 1,
        CURLOPT_HEADER => 0,
        CURLOPT_URL => $url,
        CURLOPT_FRESH_CONNECT => 1,
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_FORBID_REUSE => 1,
        CURLOPT_TIMEOUT => 4,
        CURLOPT_POSTFIELDS => http_build_query($post)
    );

    $ch = curl_init();
    curl_setopt_array($ch, ($options + $defaults));
    if( ! $result = curl_exec($ch))
    {
        trigger_error(curl_error($ch));
    }
    curl_close($ch);
    return $result;
}

/**
 * Send a GET requst using cURL
 * @param string $url to request
 * @param array $get values to send
 * @param array $options for cURL
 * @return string
 */
function curl_get($url, array $get = NULL, array $options = array())
{    
    $defaults = array(
        CURLOPT_URL => $url. (strpos($url, '?') === FALSE ? '?' : ''). http_build_query($get),
        CURLOPT_HEADER => 0,
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_TIMEOUT => 4
    );
    
    $ch = curl_init();
    curl_setopt_array($ch, ($options + $defaults));
    if( ! $result = curl_exec($ch))
    {
        trigger_error(curl_error($ch));
    }
    curl_close($ch);
    return $result;
}
?>

Be careful when using curl_exec() and the CURLOPT_RETURNTRANSFER option. According to the manual and assorted documentation:Set CURLOPT_RETURNTRANSFER to TRUE to return the transfer as a string of the return value of curl_exec() instead of outputting it out directly.When retrieving a document with no content (ie. 0 byte file), curl_exec() will return bool(true), not an empty string. I've not seen any mention of this in the manual.Example code to reproduce this:<?php    // fictional URL to an existing file with no data in it (ie. 0 byte file)    $url = 'http://www.example.com/empty_file.txt';    $curl = curl_init();        curl_setopt($curl, CURLOPT_URL, $url);    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);    curl_setopt($curl, CURLOPT_HEADER, false);    // execute and return string (this should be an empty string '')    $str = curl_exec($curl);    curl_close($curl);    // the value of $str is actually bool(true), not empty string ''    var_dump($str);?>

Don't disable SSL verification! You don't need to, and it's super easy to stay secure! If you found that turning off "CURLOPT_SSL_VERIFYHOST" and "CURLOPT_SSL_VERIFYPEER" solved your problem, odds are you're just on a Windows box. Takes 2 min to solve the problem. Walkthrough here:https://snippets.webaware.com.au/howto/stop-turning-off-curlopt_ssl_verifypeer-and-fix-your-php-config/

If you are looking the debug curl_exec, you may wish to log its details, and analyze the various time points during its execution.before curl_exec:<?php    // this will produce a curl log    curl_setopt($curl, CURLOPT_VERBOSE, true);    curl_setopt($curl, CURLOPT_STDERR, fopen('/your/writable/app/logdir/curl.log', 'a+')); // a+ to append...?>after curl_exec, but before curl_close:<?php    // this will extract the timing information    extract(curl_getinfo($curl)); // create metrics variables from getinfo    $appconnect_time = curl_getinfo($curl, CURLINFO_APPCONNECT_TIME); // request this time explicitly    $downloadduration = number_format($total_time - $starttransfer_time, 9); // format, to get rid of scientific notation    $namelookup_time = number_format($namelookup_time, 9);    $metrics = "CURL...: $url Time...: $total_time DNS: $namelookup_time Connect: $connect_time SSL/SSH: $appconnect_time PreTransfer: $pretransfer_time StartTransfer: $starttransfer_time Download: $downloadduration";    error_log($metrics);  // write to php-fpm default www-error.log, or append it to same log as above with file_put_contents(<filename>, $metrics, FILE_APPEND)?>Happy debugging

Be always aware that CURLOPT_SSL_VERIFYPEER set to FALSE or 0 should never be used for production as it makes the link inmediately vulnerable to man-in-the-middle attack, still you can use it during development, but I would suggest that only if you KNOW what are you doing, otherwise spend some more time making requests to HTTPS sites work without resorting to set that option to FALSE or 0.

<?phpclass CurlRequest{    private $ch;    /**     * Init curl session     *      * $params = array('url' => '',     *                    'host' => '',     *                   'header' => '',     *                   'method' => '',     *                   'referer' => '',     *                   'cookie' => '',     *                   'post_fields' => '',     *                    ['login' => '',]     *                    ['password' => '',]           *                   'timeout' => 0     *                   );     */                    public function init($params)    {        $this->ch = curl_init();        $user_agent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.8.0.9) Gecko/20061206 Firefox/1.5.0.9';        $header = array(        "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",        "Accept-Language: ru-ru,ru;q=0.7,en-us;q=0.5,en;q=0.3",        "Accept-Charset: windows-1251,utf-8;q=0.7,*;q=0.7",        "Keep-Alive: 300");        if (isset($params['host']) && $params['host'])      $header[]="Host: ".$host;        if (isset($params['header']) && $params['header']) $header[]=$params['header'];                @curl_setopt ( $this -> ch , CURLOPT_RETURNTRANSFER , 1 );        @curl_setopt ( $this -> ch , CURLOPT_VERBOSE , 1 );        @curl_setopt ( $this -> ch , CURLOPT_HEADER , 1 );                if ($params['method'] == "HEAD") @curl_setopt($this -> ch,CURLOPT_NOBODY,1);        @curl_setopt ( $this -> ch, CURLOPT_FOLLOWLOCATION, 1);        @curl_setopt ( $this -> ch , CURLOPT_HTTPHEADER, $header );        if ($params['referer'])    @curl_setopt ($this -> ch , CURLOPT_REFERER, $params['referer'] );        @curl_setopt ( $this -> ch , CURLOPT_USERAGENT, $user_agent);        if ($params['cookie'])    @curl_setopt ($this -> ch , CURLOPT_COOKIE, $params['cookie']);        if ( $params['method'] == "POST" )        {            curl_setopt( $this -> ch, CURLOPT_POST, true );            curl_setopt( $this -> ch, CURLOPT_POSTFIELDS, $params['post_fields'] );        }        @curl_setopt( $this -> ch, CURLOPT_URL, $params['url']);        @curl_setopt ( $this -> ch , CURLOPT_SSL_VERIFYPEER, 0 );        @curl_setopt ( $this -> ch , CURLOPT_SSL_VERIFYHOST, 0 );        if (isset($params['login']) & isset($params['password']))            @curl_setopt($this -> ch , CURLOPT_USERPWD,$params['login'].':'.$params['password']);        @curl_setopt ( $this -> ch , CURLOPT_TIMEOUT, $params['timeout']);    }        /**     * Make curl request     *     * @return array  'header','body','curl_error','http_code','last_url'     */    public function exec()    {        $response = curl_exec($this->ch);        $error = curl_error($this->ch);        $result = array( 'header' => '',                          'body' => '',                          'curl_error' => '',                          'http_code' => '',                         'last_url' => '');        if ( $error != "" )        {            $result['curl_error'] = $error;            return $result;        }                $header_size = curl_getinfo($this->ch,CURLINFO_HEADER_SIZE);        $result['header'] = substr($response, 0, $header_size);        $result['body'] = substr( $response, $header_size );        $result['http_code'] = curl_getinfo($this -> ch,CURLINFO_HTTP_CODE);        $result['last_url'] = curl_getinfo($this -> ch,CURLINFO_EFFECTIVE_URL);        return $result;    }}?>Example of use:<?php..........try        {                        $params = array('url' => 'http://www.google.com',            'host' => '',            'header' => '',            'method' => 'GET', // 'POST','HEAD'            'referer' => '',            'cookie' => '',            'post_fields' => '', // 'var1=value&var2=value            'timeout' => 20            );                        $this->curl->init($params);            $result = $this->curl->exec();            if ($result['curl_error'])    throw new Exception($result['curl_error']);            if ($result['http_code']!='200')    throw new Exception("HTTP Code = ".$result['http_code']);            if (!$result['body'])        throw new Exception("Body of file is empty");            ...............        }        catch (Exception $e)        {                    echo $e->getMessage();        }?>

Thank you for sharing this.  I was wondering why my result was 1.To get around this in a safe way, this is how I check if the result is valid.$ch = curl_init(); /// initialize a cURL session curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);$xmlResponse = curl_exec ($ch);curl_close ($ch);if (!is_string($xmlResponse) || !strlen($xmlResponse)) {    return $this->_set_error( "Failure Contacting Server" );} else {    return $xmlResponse;}

fyi:It returns false if there's an error while executing the curl session, no matter how CURLOPT_RETURNTRANSFER is set.