3v4l.org

run code in 300+ PHP versions simultaneously
<?php $testPeople = array ( "Akey" => "A", "Bkey" => "B", "Ckey" => "C", "Dkey" => "D", "Ekey" => "E",'' => "F",'' => "G",'' => "H" ); echo count($testPeople); foreach($testPeople as $key => $people) { echo $key; if (!isset($key)) echo $people; }
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, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
6AkeyBkeyCkeyDkeyEkey

preferences:
234.26 ms | 405 KiB | 353 Q