curl header bilgileri etkilenmiyor

<?php


function curl($url)
{
$user_agent = 'Spaydi yada tarayıcı bilgileri...';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_REFERER, 'http://www.referealurl.tld');
curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
$icerik = curl_exec($ch);
curl_close($ch);return $icerik;

}

function ara($bas, $son, $yazi)
{
    @preg_match_all('/' . preg_quote($bas, '/') .
    '(.*?)'. preg_quote($son, '/').'/i', $yazi, $m);
    return @$m[1];
}
$icerik = file_get_contents("https://www.siteadi.com/isim-3320338953.html");
$baslik = ara("file: '", "',", $icerik);

?>
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