3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo array_reduce(['a', 'b', 'c'], function($output, $item) { static $count = 0; return $output . ++$count . '. ' . $item . "\n"; }, '');
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
1. a 2. b 3. c
preferences:
169.68 ms | 402 KiB | 123 Q