3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(&$elements) { $new_elements = ['baz' => 'bar']; $elements = &$new_elements; $elements['bar'] = 42; print_r($elements); } $elements = [ 'foo' => 'bar', ]; foo($elements); print_r($elements);
Output for 5.6.0 - 5.6.26, 7.0.0 - 7.0.20, 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
Array ( [baz] => bar [bar] => 42 ) Array ( [foo] => bar )
preferences:
125.42 ms | 1699 KiB | 4 Q