3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo is_bool(1); print_r((bool)true); var_dump(true) ; var_export(true);
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1bool(true) true
preferences:
219.98 ms | 404 KiB | 330 Q