3v4l.org

run code in 300+ PHP versions simultaneously
<?php function get_global($name) { $global_map = &get_global_map(); return isset($global_map[$name]) ? $global_map[$name] : null; } function set_global($name, $value) { $global_map = &get_global_map(); $global_map[$name] = $value; } function &get_global_map() { static $global_map = array(); return $global_map; } set_global('foo', 42); set_global('bar', 84); var_dump(get_global('foo')); var_dump(get_global('qux'));
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 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
int(42) NULL
preferences:
96.72 ms | 2640 KiB | 4 Q