3v4l.org

run code in 300+ PHP versions simultaneously
<?php phpversion() >= "7.0.0" or die(); $foo = 'foo'; $bar = new stdClass; $bar->$foo = array(10, 20, 30); // $bar->foo => array(10, 20, 30) $bar->{$foo[0]} = 42; // dynamic property $f = 42 – derived from zero offset of ‘foo’ $bar->$foo[0] = 42; // zeroth element of array that $foo identifies = 42 var_dump($bar);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1
object(stdClass)#1 (2) { ["foo"]=> array(3) { [0]=> int(42) [1]=> int(20) [2]=> int(30) } ["f"]=> int(42) }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
preferences:
144.18 ms | 401 KiB | 196 Q