3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = ''; $array[$array[1] = 2] = 3; var_dump($array);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
string(3) " 23"

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55.51 ms | 402 KiB | 62 Q