Building multidimensional arrays in PHP with foreach

Question

How would I go about building output like this in PHP:

$items[] = array(
    'section_name' => 'Section 1 Name',
    'items' => array(
        array(
            'item_name' => 'Item 1 Name - Section 1'
            // there will be more in here
        ),
        array(
            'item_name' => 'Item 2 Name - Section 1'
            // there will be more in here
        )
    ) 
);
$items[] = array(
    'section_name' => 'Section 2 Name',
    'items' => array(
        array(
            'item_name' => 'Item 1 Name - Section 2'
            // there will be more in here
        ),
        array(
            'item_name' => 'Item 2 Name - Section 2'
            // there will be more in here
        )
    ) 
);
// and so on

with this as the input

[section] => Array (
    [0] => Array (
        [name] => Section 1 Name
        [item] => Array (
             [0] => Array (
                [name] => Item 1 Name - Section 1
                // there will be more in here
             )
             [1] => Array (
                [name] => Item 2 Name - Section 1
                // there will be more in here                   
             )

        )
    )
    [1] => Array (
        [name] => Section 2 Name
        [item] => Array (
            [0] => Array (
                [name] => Item 1 Name - Section 2
                // there will be more in here
            )

       )
   )

)

There will never be a set number of items in a section and the number of sections will vary too so I need something iterative then a fixed number.

So what do you want is just to change the keys names ?

hlscalon
– hlscalon

2014-08-10 14:16:42 +00:00
Commented Aug 10, 2014 at 14:16 — hlscalon
– hlscalon, Commented Aug 10, 2014 at 14:16

NoDataFound · Accepted Answer · 2014-08-10 14:07:22Z

1

Something like this ? :

$sections = [];
for ($sectionIndex = 0; $sectionIndex < 10; ++$sectionIndex) {
  $items = [];
  for ($itemIndex = 0; $itemIndex < 10; ++$itemIndex) {
    $items[] = [
      'item_name' => sprintf('Item %d Name - Section %d', $itemIndex, $sectionIndex);       
    ]; 
  }
  $sections[] = [
    'section_name' => sprintf("Section %d Name", $sectionIndex),
    'items' => $items
  ];
}

Replace [] by array, since I don't know which PHP version you're using.

answered Aug 10, 2014 at 14:07

NoDataFound

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Comments

user3927083 · Accepted Answer · 2014-08-10 14:16:23Z

1

Pass this your input array $section

 $items=array();
 $item=array();
 foreach ($section as $row) { 
    $tmp=array();
   $tmp['section_name']=$row['name'];
   foreach($row['item'] as $key){
          $item[]['item_name']=$key['name'];
   }
   $tmp['items']=$item;
   $items[]=$tmp;
 }

 print_r($items);

answered Aug 10, 2014 at 14:16

user3927083

1 Comment

Scott L Over a year ago

This seems to mostly work although it compounds so the second Items array includes all the items from the first as well as the ones from the second

Scott L · Accepted Answer · 2014-08-10 15:14:08Z

0

Solved with a slightly modified version of the answer from @NoDataFound

    $sections = [];
    $s = 0;
    foreach ($_POST['section'] as $section) {
        $s++;
        $items = [];
        $i = 0;
        foreach ($section['item'] as $item) {
            $i++;
            $items[] = [
                'item_name' => sprintf('Item %d Name - Section %d', $i, $s)   
            ]; 
        }
        $sections[] = [
            'section_name' => sprintf("Section %d Name", $s),
            'items' => $items
        ];
    }

answered Aug 10, 2014 at 15:14

Scott L

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