Encode and decode string with Base64 using PHP

base64_encode — Encodes data with MIME base64
string base64_encode ( $string )
This encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean, such as mail bodies.
Base64-encoded data takes about 33% more space than the original data.
Base64_encode:
<?php
$plainText = 'http://www.phpjavascript.com/';
$base64 = base64_encode($plainText);
$base64url = strtr($base64, '+/=', '-_,');
echo $base64url;
?>
Result:
aHR0cDovL3d3dy5waHBqYXZhc2NyaXB0LmNvbS8,

Base64_decode:

<?php
$plainText = "aHR0cDovL3d3dy5waHBqYXZhc2NyaXB0LmNvbS8,";
$base64url = strtr($plainText, '-_,', '+/=');
$base64 = base64_decode($base64url);
echo $base64;
?>

Result:

http://www.phpjavascript.com/