Piwik\Common::hex2bin PHP Méthode

    public static function hex2bin($str)
    {
        return pack("H*", $str);
    }

 public static function update($idvisitor, $name = false, $email = false, $phone = false, $comments = false)
 {
     if ($name == false && $email == false && $phone == false && $comments == false) {
         return false;
     }
     $buildQuery = "";
     $argSet = array();
     $argOnUpdate = array();
     $argSet[] = @Common::hex2bin($idvisitor);
     if ($name) {
         $argSet[] = $name;
         $argOnUpdate[] = $name;
         $buildQuery .= " name = ?,";
     }
     if ($email) {
         $argSet[] = $email;
         $argOnUpdate[] = $email;
         $buildQuery .= " email = ?,";
     }
     if ($phone) {
         $argSet[] = $phone;
         $argOnUpdate[] = $phone;
         $buildQuery .= " phone = ?,";
     }
     if ($comments) {
         $argSet[] = $comments;
         $argOnUpdate[] = $comments;
         $buildQuery .= " comments = ?,";
     }
     $buildQuery = trim(substr_replace($buildQuery, "", -1));
     $arguments = array_merge($argSet, $argOnUpdate);
     Db::query("INSERT INTO " . Common::prefixTable('chat_personnal_informations') . " SET idvisitor = ?, {$buildQuery} ON DUPLICATE KEY UPDATE {$buildQuery}", $arguments);
     return true;
 }