Tester si une url est redirigée par un header langage php

<?php
/*
http://www.gamerz.be/programmation-php-/t-php-tester-url-215751.html
http://www.phpsources.org/scripts92-PHP.htm
http://perishablepress.com/press/2006/12/18/automatic-language-translation-methods/
http://www.comscripts.com/scripts/php.babelfish-translator.2039.html
*/

/* article d'origine de la fonction
http://www.pckult.net/index.php?Itemid=7&id=806&option=com_content&task=view
test que le http port 80 pas de ftp,https ...
*/

function test_url($url){
    $url = @parse_url($url);

    if (!$url)
    {
        return false;
    }

    $url = array_map('trim', $url);
    $url['port'] = (!isset($url['port'])) ? 80 : (int)$url['port'];
    $path = (isset($url['path'])) ? $url['path'] : '';

    if ($path == '')
    {
        $path = '/';
    }

    $path .= (isset($url['query'])) ? "?$url[query]" : '';

    if (isset($url['host']) AND $url['host'] != gethostbyname($url['host']))
    {
        if (PHP_VERSION >= 5)
        {
            $headers = get_headers("$url[scheme]://$url[host]:$url[port]$path");
        }
        else
        {
            $fp = @fsockopen($url['host'], $url['port'], $errno, $errstr, 30);

            if (!$fp)
            {
                return false;
            }
            fputs($fp, "HEAD $path HTTP/1.1\r\nHost: $url[host]\r\n\r\n");
            $headers = fread($fp, 4096);
            fclose($fp);
        }
        $headers = (is_array($headers)) ? implode("\n", $headers) : $headers;
        return (bool)preg_match('#^HTTP/.*\s+[(200|301|302)]+\s#i', $headers);
    }
    return false;
}



if(isset($_POST['url_test']) && !empty($_POST['url_test']) &&  $_POST['submit_bt']=="Tester" ){
$url='http://'.$_POST['url_test'];

    if (test_url($url)) {
    
    echo $url.' est valide !<br />';
    echo '<a href="javascript:history.back();">Recommencer un test</a>';
    
    /* choisir un type de redirection
    
    /* immediat
    header( 'Location:'.$url);
    */
    
    
    /* attendre 3 secondes
    header( 'refresh: 3; url='.$url);
    echo '<h1>Bonne viste attendre 3 secondes...</h1>';
    */
    
    /*
    header( 'refresh: 0; url='.$url);
    echo '<h1>Bonne viste !</h1>';
    */
    
    /* attendre 2 secondes
    echo '<meta http-equiv="refresh" content="2;url='.$url.'">';
    */
    
    } else {
    
    echo 'Url inconnue !<br />';
    echo '<a href="javascript:history.back();">Recommencer un test</a>';
   
    }

} else {

echo '


<form action="" method="post">
http://<input type="text" name="url_test" size="100">
<input type="submit" name="submit_bt" value="Tester">
</form>

';

}
?>

$url = 'http://monsitetraduit.com/blabla';

$rContext = stream_context_create(array(
                    'http' => array(
                        'timeout' => 1,
                        'max_redirects' => 1
                    )
                )
);

if(false === @fopen($url, 'r', null, $rContext)) {
    // la page existe
} else {
    // la page n'existe pas
}