Getting values from different keys belonging to different arrays and merging them into another array

Question

I have two arrays containing different keys and values. However, some keys store strings (integers) which I want to mix together in a single array (ie array_merge). All I need is to achieve is to collect these integers.

using var_dump the arrays look like these:

this is the first one

array
    0 => 
        array
           'featured_pic' => string '740' (length=3)
    1 => 
        array
           'featured_pic' => string '741' (length=3)
    2 => 
        array
          'featured_pic' => string '742' (length=3)

and this is the second one

array
   0 => 
     array
       'accommodation_roomphoto' => string '456' (length=3)
       'accommodation_roomname' => string 'Single room' (length=11)
       'accommodation_roomsize' => string 'single' (length=6)
       'price_unit' => string '60' (length=2)
       'price_currency' => string 'USD' (length=3)
   1 => 
     array
       'accommodation_roomphoto' => string '434' (length=3)
       'accommodation_roomname' => string 'Double room' (length=11)
       'accommodation_roomsize' => string 'double' (length=6)
       'price_unit' => string '80' (length=2)
       'price_currency' => string 'USD' (length=3)

what I really need is featured_pic from array#1 and accommodation_roomphoto from array#2. I need to collect all those numbers into a single array (I don't need the keys anymore - all I need is a series of numbers that come from those keys, in the example above: 740, 741, 742, 456, 434):

array
   0 => '740'
   1 => '741'
   2 => '742'
   3 => '456'
   4 => '434'

the resulting array should be something like the example above (order is not important)

Thank you

Can you provide an example showing what you want your final array to look like? — Brian Glaz, Jan 12 '12 at 16:35
check the two keys I'm interested in "accommodation_roomphoto" and "featured_pic", I only need series of numbers such as (numers are from the example above): '740', '741', 742', '456', '434 — unfulvio, Jan 12 '12 at 16:39

score 0 · Answer 1 · answered Jan 12 '12 at 16:42

$new_array = array();

foreach($array1 as $array) {
    $new_array[] = intval($array['featured_pic']);
}

foreach($array2 as $array) {
    $new_array[] = intval($array['accommodation_roomphoto']);
}

This is my understanding of the question.

I have simply done a foreach on both arrays and taken out the required date from each.

I have also used intval() to convert the strings into integers in your new array.

Hope this helps.

score 0 · Accepted Answer · answered Jan 12 '12 at 16:43

If you know the keys you are interested in, this is just a simple looping job:

$result = array();

foreach ($array1 as $item) {
  if (isset($item['featured_pic'])) $result[] = (int) $item['featured_pic'];
}
foreach ($array2 as $item) {
  if (isset($item['accommodation_roomphoto'])) $result[] = (int) $item['accommodation_roomphoto'];
}

print_r($result);

Alternatively if you don't know the keys you want, this routine will grab all numbers stored as strings from both arrays:

$result = array();

foreach ($array1 as $item) {
  foreach ($item as $sub) {
    if (is_numeric($sub)) $result[] = (int) $sub;
  }
}
foreach ($array2 as $item) {
  foreach ($item as $sub) {
    if (is_numeric($sub)) $result[] = (int) $sub;
  }
}

print_r($result);

...however this will not give you result you want from the array above, because the price_unit key in the second set of arrays is also numeric.

score 0 · Answer 3 · answered Jan 12 '12 at 16:51

One-liner using array_merge and array_map. Assumes that your two arrays are $a and $b:

$result = array_merge(
             array_map(function($el) { return $el['featured_pic']; }, $a),
             array_map(function($el) { return $el['accomodation_roomphoto']; }, $b)
          );

Requires PHP >= 5.3 for the anonymous functions passed to array_map.

Getting values from different keys belonging to different arrays and merging them into another array

3 Answers3