3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(0x7FFFFFFF => 42); $a[] = 37; var_dump($a);
Output for 4.3.0 - 7.1.0
array(2) { [2147483647]=> int(42) [2147483648]=> int(37) }