Here is my function after run it got error

any one who know about this can you help me for fix this

 public static function encryptIt( $q ) {
	
	/*
	* This Function Encrypt the md5 string to orignal string
	* @param you should pass orignal string to use this function
	* @return MD5 Encrypted string 
	* @writer Manish Garg
	*/
    $cryptKey  = 'qJB0rGtIn5UB1xG03efyCp';
    $qEncoded      = base64_encode( mcrypt_encrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), $q, MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ) );
   return( $qEncoded );
}

public static function decryptIt( $q ) {
	/*
	* This Function Decrypt the md5 string to orignal string
	* @param you should pass orignal string to use this function
	* @return MD5 Decrypted string 
	* @writer Manish Garg

	*/
    $cryptKey  = 'qJB0rGtIn5UB1xG03efyCp';
    $qDecoded      = rtrim( mcrypt_decrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), base64_decode( $q ), MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ), "\0");
    return( $qDecoded );
}