3v4l.org

run code in 300+ PHP versions simultaneously
<?php function func () { static $loc = 0; global $globA; global $globB; $globA = $loc; $globB =& $loc; $loc++; } $globA = null; $globB = null; func(); var_dump($globA); var_dump($globB); func(); var_dump($globA); var_dump($globB); func(); var_dump($globA); var_dump($globB); func(); var_dump($globA); var_dump($globB);
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
int(0) NULL int(1) NULL int(2) NULL int(3) NULL
preferences:
67.17 ms | 406 KiB | 5 Q