3v4l.org

run code in 500+ PHP versions simultaneously
<?php $patternCallbacks = [ '~\[code](.*?)\[/code]~is' => function($m) { return '[code]' . base64_encode($m[1]) . '[/code]'; }, ]; echo preg_replace_callback_array( $patternCallbacks, 'This is my [code]script[/code] to display' );

preferences:
104.26 ms | 1243 KiB | 5 Q