在php中遍历多维数组

Question

i have this multidimensional array in php and I need be able to access all the elements including the first element "Computers". I need to turn this array into two arrays and i used this loop

    $i = 0;
$left = array();
$right = array();
    foreach ($all_products as $product) {
    if ($i++ % 2 == 0) {

        $left[]  = $product;
    } else {
        $right[] = $product;
    }
}

Here is the structure of $all_products

Array ( 
  [Computers] => Array ( 
    [macbook] => Array ( [price] => 575 
                           [quantity] => 3               
                           [image] => T-SMALL-blue.png 
                           [descr] => osx
                          )
    [windows] => Array ( [price] => 285 
                         [quantity] => 1 
                         [image] => TU220-blue.png 
                         [descr] => something windows )  
                        ) 
 [Screens] => Array ( 
    [FIREBOX S5510 15", SPKRS ] => Array ( [price] => 489 
                                           [quantity] => 3 
                                           [image] => [descr] => SPKRS 
                           ) 
                        ) 
 [Software] => Array ( .....

but when i logger $left or $right

[0] => Array ( 
  [macbook] => Array ( 
     [price] => 575 
     [quantity] => 3 
     [image] => TOWER-PC-LENOVO-SMALL-blue.png 
     [descr] => osx
             ) 
  [windows] => Array ( 
     [price] => 575 
     [quantity] => 3 
     [image] => TOWER-PC-LENOVO-SMALL-blue.png 
     [descr] => something windows
) 
[1] => Array 

where is the text "Computers", "Screens"

Answer 1

You are adding next element to $left and $right when you use [], and its numerical. Try:

foreach ($all_products as $key=>$product) {
if ($i++ % 2 == 0) {
        $left[$key][]  = $product;
    } else {
        $right[$key][] = $product;
    }
}

Answer 2

You need to use a foreach loop with $key variable:

foreach ($all_products as $arrayIndex=>$product) {

this variable ( $arrayIndex , can be named anything for sure), will hold the array indexes strings inside the foreach loop.