- base64_encode: documentation ( source)
<?php
$text = '{"showpassword":"yes","bgcolor","#000000"}';
$key = 'qw8J';
$outText = '';
for($i=0;$i<strlen($text);$i++) {
$outText .= $text[$i] ^ $key[$i % strlen($key)];
}
echo base64_encode($outText);
?>