PHP - 使用函数引用更改值在多维数组中不起作用？

Question

I want to change the values in multidimensional array using a function:

I have this:

$arr1 = array( 1 , array( 2, 3 ) );

// NOTE the & in function

function change_value_in_array( &$array ){
  foreach( $array as $k=>$v ){
    if( is_array( $v ) ){
      change_value_in_array($v);
    }else{
      $array[$k] = $v*10;
    }
  }
}

change_value_in_array($arr1);

var_dump($arr1);

OUTPUT:

$arr1 = array( 10 , array( 2, 3 ) );

I WANT THIS OUTPUT:

$arr1 = array( 10 , array( 20, 30 ) );

Answer 1

COMPLETE SOLUTION: = Casimir answer is best solution...

$arr1 = array( 1 , array( 2, 3 ) );

// NOTE the & in function
// If use the & in foreach loop, the $v will be the reference and not a copy. Maybe the simplest way.

function change_value_in_array( &$array ){
  foreach( $array as $k=>&$v ){
    if( is_array( $v ) ){
      change_value_in_array($v);
    }else{
      $v = $v*10;
    }
  }
}

change_value_in_array($arr1);

var_dump($arr1);

NOTICE: This answer was lifted from Question text as written by OP.