3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a[-99] = 'bilk'; $a[-100]= 'abc'; var_export($a);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.13, 5.3.0 - 5.3.2, 5.3.4 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array ( -99 => 'bilk', -100 => 'abc', )
Output for 5.2.14 - 5.2.17, 5.3.3
array ( 18446744073709551517 => 'bilk', 18446744073709551516 => 'abc', )
preferences:
240.06 ms | 401 KiB | 424 Q