3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( filter_var('true', FILTER_VALIDATE_BOOLEAN), filter_var('false', FILTER_VALIDATE_BOOLEAN) );
Output for 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 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
bool(true) bool(false)
preferences:
196.36 ms | 405 KiB | 298 Q