3v4l.org

run code in 300+ PHP versions simultaneously
<?php ini_set('error_reporting', -1); ini_set('display_errors', 'on'); function generator() { $a = []; if(empty($a)){ return null; } foreach($a as $i){ yield $i; } } if ($generator = generator()) { echo get_class($generator); foreach($generator as $i) { echo $i; } } else { echo 'Nothing'; }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Generator
preferences:
166.24 ms | 404 KiB | 217 Q