3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f() { $arr = ['u' => 'U']; $x = 'x'; $y = 'y'; $result = (fn () => [$x, $x = 'xx', $x, $y, $arr, $arr['w'] = 'W', $arr, $newvar = 'newvar'])(); var_export(get_defined_vars()); } f();
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 'arr' => array ( 'u' => 'U', ), 'x' => 'x', 'y' => 'y', 'result' => array ( 0 => 'x', 1 => 'xx', 2 => 'xx', 3 => 'y', 4 => array ( 'u' => 'U', ), 5 => 'W', 6 => array ( 'u' => 'U', 'w' => 'W', ), 7 => 'newvar', ), )
preferences:
75.89 ms | 407 KiB | 5 Q