3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('true', false); $x = true; var_dump($x);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Constant true already defined in /in/srrbv on line 2 bool(true)
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.3.11, 4.4.0 - 4.4.9, 5.0.1 - 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 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Constant true already defined in /in/srrbv on line 2 bool(true)
Output for 7.3.32 - 7.3.33, 7.4.26
bool(true)
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/srrbv on line 2 bool(true)

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229.37 ms | 401 KiB | 310 Q