3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = 0; $a = array(&$x); $b = $a; $x = 2; unset($x); $b[1]++; $b[0]++; echo $a[0], ' ', $b[0];

This is an error 500

Value for `_results` contains invalid data `array`


preferences:
156.63 ms | 3053 KiB | 8 Q