Online PHP editor | output for DOpad

@ 2015-09-28T13:15:09Z

<?php

$arr = array();
$a = [0,1,2,3,4,5];
$b = [0,1,2,3,4,5];
$c = [0,1,2,3,4,5];
$d = [0,1,2,3,4,5];
$e = [0,1,2,3,4,5];
$f = [0,1,2,3,4,5];
$g = [0,1,2,3,4,5];
$arr[] = $a;
$arr[] = $b;
$arr[] = $c;
$arr[0][2] = $d;
$arr[0][2][3] = $e;
$arr[2][1] = $f;
$arr[1] = $g;

print_r($arr);

    function array_keys_recur($array) {
     if(!is_array($array)) return false;
     $keys = array_keys($array);
     foreach($keys as $k => $key) {
       $keys[$k] = array_keys_recur($key);
     }
     return $keys;
   }
   
   $keys = array_keys_recur($arr);
   
   print_r($keys);

Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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: Array ( [0] => Array ( [0] => 0 [1] => 1 [2] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [4] => 4 [5] => 5 ) [3] => 3 [4] => 4 [5] => 5 ) [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => Array ( [0] => 0 [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) ) Array ( [0] => [1] => [2] => )

preferences:dark modelive preview