php - Converting multi-dimensional array to a single HTML-like array? -

what fastest or convenient possible way convert multi-dimensional array single html-like array (the method used set name attribute in html forms)? example,

$ar = [     'x' => ['a' => 1, 'b' => 2, 'c' => 3],     'y' => ['yy' => ['yyy' => 3]],     'z' => 3333,     'm' => [1, 2], ]; 

should converted to:

  $ar = [         'x[a]' => 1,         'x[b]' => 2,         'x[c]' => 3,         'y[yy][yyy]' => 3,         'z' => 3333,         'm[0]' => 1,         'm[1]' => 2,     ]; 

here first try:

$ar = [     'x' => ['a' => 1, 'b' => 2, 'c' => 3],     'y' => ['yy' => ['yyy' => '3']],     'z' => 3333,     'm' => [1, 'x'] ];  function convert($key, $value, &$new) {     foreach ($value $k => $v) {         if (is_array($v)) {             convert($key."[$k]", $v, $new);         }         else {             $new[$key."[$k]"] = $v;         }     } } $r = []; convert(null, $ar, $r); print_r($r);; 

i not know speed, convenient way trick:

$ar = convert_array( $ar );  function convert_array( $a, $key = '' ) {     static $arr = array();     foreach( $a $k => $v ) {         $key_name = $key == '' ? $k : $key . '[' . $k . ']';         if ( is_array( $v) ) {             convert_array( $v, $key_name );         } else {             $arr[$key_name] = $v;         }     }     return $arr; }