mini safelink

<?php
$ENABLE_kiikun = 1;

function get_gd_id($string) {
if(ereg('folders', $string)){
return str_replace('?usp=sharing', '', basename('https://drive.google.com/drive/folders/'.$string.'?usp=sharing'));
}else{
  if (strpos($string, "/edit")) {
    $string = str_replace("/edit", "/view", $string);
  } else if (strpos($string, "?id=")) {
    $parts = parse_url($string);
    parse_str($parts['query'], $query);
    return $query['id'];
  } else if (!strpos($string, "/view")) {
    $string = $string . "/view";
  }
  $start  = "file/d/";
  $end    = "/view";
  $string = " " . $string;
  $ini    = strpos($string, $start);
  if ($ini == 0) {
    return "";
  }
  $ini += strlen($start);
  $len = strpos($string, $end, $ini) - $ini;
  return substr($string, $ini, $len);
}
}
function fnEncrypt( $string) {
    $secret_key = 'drivekey';
    $secret_iv = 'google';
    $output = false;
    $encrypt_method = "AES-256-CBC";
    $key = hash( 'sha256', $secret_key );
    $iv = substr( hash( 'sha256', $secret_iv ), 0, 16 );
    $output = base64_encode( openssl_encrypt( $string, $encrypt_method, $key, 0, $iv ) );
    return $output;
}

function kiikun($content){
    global $ENABLE_kiikun;
    if($ENABLE_kiikun){
        $domen = 'http://space.kiikun.com/';
        preg_match_all('/href="(.*?)"/s', $content, $matches);
        foreach($matches[1] as $link){
            if(ereg('drive.google.com', $link)){
                $asli[] = $link;
                $ganti[] = $domen.'?id='.fnEncrypt(get_gd_id($link));
            }
        }
        $crot = str_replace($asli, $ganti, $content);
        return apply_filters('the_content', $crot);
    }else{
        return $content;
    }
}
?>