3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function search($input) { $result = $input; foreach($input as $a) foreach($input as $b) $result []= $a . $b; return array_filter(array_unique($result)); } print json_encode(search(["a", "b"])) . "\n"; print json_encode(search(["a", "b", "c"]));
Output for 5.4.0 - 7.2.0
["a","b","aa","ab","ba","bb"] ["a","b","c","aa","ab","ac","ba","bb","bc","ca","cb","cc"]
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/opMms on line 13
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/opMms on line 13
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/opMms on line 13
Process exited with code 255.