best method to encrypt or decrypt in php

Here is a safe encrypt and decrypt function for php developer. You can Encrypt and Decrypt using md5. The md5() function calculates the MD5 hash of a string. md5() and sha1() provides the same functinality of encryption in php but they differ in a simple way that md5() generates 32 characters of encrypted string which sha1() generates same of 40 characters.

<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/


function encrypt_decrypt($action, $string) {
   $output = false;

   $key = 'My strong random secret key';

   // initialization vector 
   $iv = md5(md5($key));

   if( $action == 'encrypt' ) {
       $output = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, $iv);
       $output = base64_encode($output);
   }
   else if( $action == 'decrypt' ){
       $output = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, $iv);
       $output = rtrim($output, "");
   }
   return $output;
}

?>

How to use encrypt or decrypt code:
 

<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.com/
*/


$plain_txt = "This is my plain text";
$encrypted_txt = encrypt_decrypt('encrypt', $plain_txt);
echo "Encrypted = $encrypted_txt\n";
echo "
";
$decrypted_txt = encrypt_decrypt('decrypt', $encrypted_txt);
echo "Decrypted = $decrypted_txt\n";

?>

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The Editorial Team of 4everTutorials consists of a group of PHP Professionals.