3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo TRUE.PHP_EOL; define('TRUE', 0); echo TRUE.PHP_EOL; if (TRUE) { echo "TRUE"; } else { echo "FALSE!!!"; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1 Warning: Constant TRUE already defined in /in/2heoc on line 5 1 TRUE
Output for 5.1.3 - 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
1 1 TRUE
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.2 - 5.0.5, 5.1.0 - 5.1.2
1 0 FALSE!!!
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/2heoc on line 3 1PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/2heoc on line 7 0PHP_EOLFALSE!!!
preferences:
313.89 ms | 402 KiB | 460 Q