3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = "3d8"; echo $foo . PHP_EOL; $foo++; echo $foo . PHP_EOL; $foo++; echo $foo . PHP_EOL; $foo++; echo $foo . PHP_EOL;
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
3d8 3d9 3e0 4
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/Z3eOH on line 4 3d8PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/Z3eOH on line 6 3d9PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/Z3eOH on line 8 3e0PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/Z3eOH on line 10 4PHP_EOL

preferences:
263.52 ms | 402 KiB | 455 Q