URL Find [PHP Engine]

URL Find [PHP Engine]

<?php
 
$get_url = trim($_GET['url']);
$post_url = trim($_POST['url']);
 
if (empty($get_url)) {
        if (empty($post_url)) {
                echo "-1";
                exit();
        } else {
                $url = $post_url;
        }
} else {
        $url = $get_url;
}
 
function http_response($url){
    $resURL = curl_init();
    curl_setopt($resURL, CURLOPT_URL, $url);
    curl_setopt($resURL, CURLOPT_BINARYTRANSFER, 1);
    curl_setopt($resURL, CURLOPT_HEADERFUNCTION, 'curlHeaderCallback');
    curl_setopt($resURL, CURLOPT_FAILONERROR, 1);
    curl_exec ($resURL);
    $intReturnCode = curl_getinfo($resURL, CURLINFO_HTTP_CODE);
    curl_close ($resURL);
    if ($intReturnCode != 200 && $intReturnCode != 302 && $intReturnCode != 304) { return 0; } else return 1;
}
 
$file_handle = fopen("admin_pattern.txt", "rb");
while (!feof($file_handle) ) {
        $line_of_text = fgets($file_handle);
        $parts = explode('=', $line_of_text);
        if (http_response($url . $parts[0]) == 1) {
                echo $parts[0];
                exit();
        }
}
echo "-2";
?>