Simple mcrypt encrypt & decrypt functions for PHP

<?php
 
    $text ='some text';
    $salt ='whatever_you_want';
 
    function simple_encrypt($text,$salt)
    {  
        return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $salt, $text, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
    }
 
    function simple_decrypt($text,$salt)
    {  
        return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $salt, base64_decode($text), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
    }
 
?>

// *****************************************
// FUNCTION: encrypt_string($string)
// *****************************************
// Encrypt a string using the secret key
function encrypt_string($string) {
	// Include config.php for secret key
	include("resources/config.php");
	
	// http://blog.justin.kelly.org.au/simple-mcrypt-encrypt-decrypt-functions-for-p/
	return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $secret_key, $string, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
}


// *****************************************
// FUNCTION: decrypt_string($string)
// *****************************************
// Decrypt a string using the secret key
function decrypt_string($string) {
	// Include config.php for secret key
	include("resources/config.php");
	
	// http://blog.justin.kelly.org.au/simple-mcrypt-encrypt-decrypt-functions-for-p/
	return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $secret_key, base64_decode($string), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
}

// *****************************************
// FUNCTION: get_decrypted_password($id, $uid)
// *****************************************
// Returns a decrypted password only if the user ID can access it
function get_decrypted_password($id, $uid) {

	// Check if I have permissions
	if (check_object_permissions($id, $uid)) {
		$encrypted_pass = get_sql_value("SELECT password FROM data WHERE id=$id");
		return decrypt_string($encrypted_pass);
	}
	else {
		return "ACCESS DENIED";
	}
}