3v4l.org

run code in 300+ PHP versions simultaneously
<?php for($i = 0; $i < 10; $i++) { $q = null; if (is_null($q)) { echo $i; } }
Output for 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
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preferences:
168.72 ms | 403 KiB | 205 Q