3v4l.org

run code in 300+ PHP versions simultaneously
<?php $true = true; $false = false; var_dump(isset($true)) . PHP_EOL; var_dump(isset($thing)) . PHP_EOL; var_dump(isset($false)) . 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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 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 - 8.3.6
bool(true) bool(false) bool(true)
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
bool(true) Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/UPus5 on line 6 bool(false) Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/UPus5 on line 7 bool(true) Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/UPus5 on line 8
preferences:
251.75 ms | 402 KiB | 355 Q