3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array( '' => 'foo', 'foo' => '', null, array(), 1, true, false, ); foreach($a as $k => $v) { echo "$k => $v\n"; var_dump(!empty($a[$k])); var_dump(isset($a[$k]) && $a[$k]); }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
=> foo bool(true) bool(true) foo => bool(false) bool(false) 0 => bool(false) bool(false) Warning: Array to string conversion in /in/u3cvg on line 13 1 => Array bool(false) bool(false) 2 => 1 bool(true) bool(true) 3 => 1 bool(true) bool(true) 4 => bool(false) bool(false)
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
=> foo bool(true) bool(true) foo => bool(false) bool(false) 0 => bool(false) bool(false) Notice: Array to string conversion in /in/u3cvg on line 13 1 => Array bool(false) bool(false) 2 => 1 bool(true) bool(true) 3 => 1 bool(true) bool(true) 4 => bool(false) bool(false)
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, 7.3.32 - 7.3.33
=> foo bool(true) bool(true) foo => bool(false) bool(false) 0 => bool(false) bool(false) 1 => Array bool(false) bool(false) 2 => 1 bool(true) bool(true) 3 => 1 bool(true) bool(true) 4 => bool(false) bool(false)
preferences:
255.28 ms | 403 KiB | 311 Q