3v4l.org

run code in 300+ PHP versions simultaneously
<?php function arr($array) { var_dump(key($array)); var_dump(current($array)); } $a = array('a' => 1, 'b' => 2, 'c' => 3); arr($a); next($a); arr($a); var_dump(key($a)); var_dump(current($a));
Output for 4.4.1, 5.2.4 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(1) "a" int(1) string(1) "b" int(2) string(1) "b" int(2)
Output for 4.3.0 - 4.3.11, 4.4.0, 4.4.2 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.3
string(1) "a" int(1) string(1) "a" int(1) string(1) "b" int(2)
preferences:
201.39 ms | 402 KiB | 357 Q