3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array = array ( 1, array (1, 2, array ( 1, 2 ) ), array (1, 2, 3), 2, array( 1, array ( 1, array (1, 2) ) ) ); function findActives($array, $path_child=null){ foreach ($array as $key => $unknown ) { $path_child[] = $array[$key]; /* if (in_array('2') { $path_child = array($key, "active"); } */ if (is_array($unknown)) { findActives($unknown, $path_child); } } return ($path_child); } // findActives($array); function array_flatten($array) { $return = array(); foreach ($array as $key => $value) { if (is_array($value)){ $return = array_merge($return, array_flatten($value));} else {$return[$key] = $value;} } return $return; } $path_child = array_flatten($array); print_r($path_child);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 1 [2] => 2 [3] => 2 [4] => 2 [5] => 1 [6] => 2 [7] => 3 [8] => 1 [9] => 1 [10] => 1 [11] => 2 )