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run code in 150+ php & hhvm versions
Bugs & Features
<?php $array1 = ['a', 'b']; $array2 = ['c', 'd']; $array3 = ['e', 'f']; $arrays = [$array1, $array2, $array3]; function array_cartesian($arrays) { if(count($arrays) == 0) { return array(array()); } $a = array_shift($arrays); $c = array_cartesian($arrays); $r = []; foreach($a as $v) { foreach($c as $p) { $r[] = array_merge(array($v), $p); } } return $r; } print_r(array_cartesian($arrays));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => a [1] => c [2] => e ) [1] => Array ( [0] => a [1] => c [2] => f ) [2] => Array ( [0] => a [1] => d [2] => e ) [3] => Array ( [0] => a [1] => d [2] => f ) [4] => Array ( [0] => b [1] => c [2] => e ) [5] => Array ( [0] => b [1] => c [2] => f ) [6] => Array ( [0] => b [1] => d [2] => e ) [7] => Array ( [0] => b [1] => d [2] => f ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/rL8tt on line 3
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 '[' in /in/rL8tt on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/rL8tt on line 3
Process exited with code 255.