PHP: get_headers

Description

array get_headers ( string url [, int format] )

get_headers() returns an array with the headers sent by the server in response to a HTTP request. Returns FALSE on failure.

If the optional format parameter is set to 1, get_headers() parses the response and sets the array's keys.

Example 1. get_headers() example

<?php $url = 'http://www.example.com'; print_r(get_headers($url)); print_r(get_headers($url, 1)); ?>
The above example will output something similar to:
Array ( [0] => HTTP/1.1 200 OK [1] => Date: Sat, 29 May 2004 12:28:13 GMT [2] => Server: Apache/1.3.27 (Unix) (Red-Hat/Linux) [3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT [4] => ETag: "3f80f-1b6-3e1cb03b" [5] => Accept-Ranges: bytes [6] => Content-Length: 438 [7] => Connection: close [8] => Content-Type: text/html ) Array ( [0] => HTTP/1.1 200 OK [Date] => Sat, 29 May 2004 12:28:14 GMT [Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux) [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT [ETag] => "3f80f-1b6-3e1cb03b" [Accept-Ranges] => bytes [Content-Length] => 438 [Connection] => close [Content-Type] => text/html )

User Contributed Notes
get_headers

david at nothisbit dot futuresbright dot com
05-Apr-2005 06:03


After discovering that some webservers reply with "Content-Type" and others with "Content-type" I modified the function below to use strtolower($key) to make for easy checking against these case differences.

aeontech at gmail dot com
23-Dec-2004 07:20


In response to dotpointer's modification of Jamaz' solution...



Here is a small modification of your function, this adds the emulation of the optional $format parameter.



<?php

if(!function_exists('get_headers')) {

    

    /**

    * @return array

    * @param string $url

    * @param int $format

    * @desc Fetches all the headers

    * @author cpurruc fh-landshut de

    * @modified by dotpointer

    * @modified by aeontech

    */

    function get_headers($url,$format=0)

    {

        $url_info=parse_url($url);

        $port = isset($url_info['port']) ? $url_info['port'] : 80;

        $fp=fsockopen($url_info['host'], $port, $errno, $errstr, 30);

        

        if($fp)

        {

            $head = "HEAD ".@$url_info['path']."?".@$url_info['query']." HTTP/1.0\r\nHost: ".@$url_info['host']."\r\n\r\n";       

            fputs($fp, $head);       

            while(!feof($fp))

            {

                if($header=trim(fgets($fp, 1024)))

                {

                    if($format == 1)

                    {

                        $key = array_shift(explode(':',$header));

                        // the first element is the http header type, such as HTTP 200 OK,

                        // it doesn't have a separate name, so we have to check for it.

                        if($key == $header)

                        {

                            $headers[] = $header;

                        }

                        else

                        {

                            $headers[$key]=substr($header,strlen($key)+2);

                        }

                        unset($key);

                    }

                    else

                    {

                        $headers[] = $header;

                    }

                }

            }

            return $headers;

        }

        else

        {

            return false;

        }

    }

}

?>