Encryption and Decryption in PHP

Encryption means convert to such form which is not easy to understand .

base64_encode which encrypt current string or data , also helpful to store secure data.

base64_decode which decrypt encrypted data. 

<?php

$var1 = 'test'; 

echo base64_encode($var1); 

//dGVzdA==

echo '<p>'.base64_decode('dGVzdA');

?>

md5 encryption - which cannot decode - one way encryption

<?php

$sampl = 'sample text here';

echo md5($sampl);

?>