php - Call array with array_key and get the array value -

i want send key of multi dimension array function , value of key, should item or , sub array. imagine have function:

public function returnarray($index){         $arr = [             'name' => 'ali',             'children' => [                 '1' => 'reza',                 '2' => 'hasan',                 '3' => 'farhad',                 'info' => [                     'a',                     'b',                     'c'                 ]             ]         ];         return $arr[$index];     } 

and when call this:

returnarray('[name][children][info]') 

the result should info array.

what should do?

thanks in advance.

just fyi, code smells bad - re-implementing array within string, makes me think it's idea access array directly this:

$arr["name"]["children"]["info"] 

but, sake of complete answers, let's write function want.

firstly, rather passing in index within single string, functions have parameters already, let's exploit feature. within function, can array containing passed-in parameters using [func_get_args](http://php.net/manual/en/function.func-get-args.php).

// remove parameter $index, don't know how many parameters there be. function returnarray(){     $arr = [         'name' => 'ali',         'children' => [             '1' => 'reza',             '2' => 'hasan',             '3' => 'farhad',             'info' => [                 'a',                 'b',                 'c'             ]         ]      ];  // store reference position in array care about:     $position = $arr;      foreach(func_get_args() $arg) {  // update reference position according passed in parameters.         $position = $position[$arg];     }      return $position; } 

then can call function this:

returnarray("children", "info");  /* returns:  array(3) {   [0]=>   string(1) "a"   [1]=>   string(1) "b"   [2]=>   string(1) "c" } */