PHP - encryption for passwords and user data other than using the built-in encryption Algos.

phpcrypt.php

<?php

     function safe_b64encode($string) {
	$skey   = "your_key"; //replace this with anything
        $data = base64_encode($string);
        $data = str_replace(array('+','/','='),array('-','_',''),$data);
        return $data;
    }

     function safe_b64decode($string) {
	$skey   = "your_key"; //replace this with what you have put in encode function
        $data = str_replace(array('-','_'),array('+','/'),$string);
        $mod4 = strlen($data) % 4;
        if ($mod4) {
            $data .= substr('====', $mod4);
        }
        return base64_decode($data);
    }

     function crypto_irf($value) { 
        if(!$value)
	{
	    return false;
	}
	$skey = "your_key";
        $text = $value;
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
        $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $skey, $text, MCRYPT_MODE_ECB, $iv);
        return trim(safe_b64encode($crypttext)); 
    }

     function decrypto_irf($value) {
        if(!$value)
	{
	    return false;
	}
	$skey   = "your_key";
        $crypttext = safe_b64decode($value); 
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
        $decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $skey, $crypttext, MCRYPT_MODE_ECB, $iv);
        return trim($decrypttext);
    }