example1.php

<?php

/**
 * Encrypt and decrypt
 * 
 * @author Karthick <karthi.karthi47@gmail.com>
 * @link Coming Soon
 *
 * @param string $string string to be encrypted/decrypted
 * @param string ENCRYPTION_KEY what to do with this? SECRET KEY for Encypt and Decrypt
 */


define("ENCRYPTION_KEY", "karthick@2018@isthehiddenkey#$%");
$string = "Smile Please!";

echo $encrypted = encrypt($string, ENCRYPTION_KEY);
echo "<br />";
echo $decrypted = decrypt($encrypted, ENCRYPTION_KEY);

/**
 * Returns an encrypted & utf8-encoded
 */
function encrypt($pure_string, $encryption_key) {
    $iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $encrypted_string = mcrypt_encrypt(MCRYPT_BLOWFISH, $encryption_key, utf8_encode($pure_string), MCRYPT_MODE_ECB, $iv);
    return $encrypted_string;
}

/**
 * Returns decrypted original string
 */
function decrypt($encrypted_string, $encryption_key) {
    $iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $decrypted_string = mcrypt_decrypt(MCRYPT_BLOWFISH, $encryption_key, $encrypted_string, MCRYPT_MODE_ECB, $iv);
    return $decrypted_string;
}
?>