3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public $bar; public function __construct($bar = "") { $this->bar = $bar; } } $array = array( new Foo("a"), new Foo("b"), new Foo("c"), new Foo("d") ); echo json_encode($array)."\n"; unset($array[2]); echo json_encode($array)."\n";
Output for 5.6.38, 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
[{"bar":"a"},{"bar":"b"},{"bar":"c"},{"bar":"d"}] {"0":{"bar":"a"},"1":{"bar":"b"},"3":{"bar":"d"}}
preferences:
116.24 ms | 1774 KiB | 4 Q