3v4l.org

run code in 300+ 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' );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
This is my [code]c2NyaXB0[/code] to display

preferences:
108.33 ms | 1248 KiB | 4 Q