3v4l.org

run code in 500+ PHP versions simultaneously
<?php function test() { set_error_handler(function ($errno, $errstr, $errfile, $errline, $context = null) { var_dump($context); }); $a = 1; $$a = 2; $x++; // generates error } test();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.6
NULL
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
array(3) { ["a"]=> int(1) ["x"]=> NULL ["1"]=> int(2) }

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70.18 ms | 1523 KiB | 4 Q