PhP multidimensional array to individual array - php

Question

I have a multidimensional array which I want to convert to individual arrays.
Original array is
$hos_pabsl = array(
0 =>
array(
'tile_id' => '1',
'tile_type' => '4',
'title' => 'Introduction',
'topicNum' => '1',
'topicTitle' => 'Introduction',
'subNum' => NULL,
),
1 =>
array(
'tile_id' => '2',
'tile_type' => '9',
'title' => 'Beer',
'topicNum' => '2',
'topicTitle' => 'Beer',
'subNum' => NULL,
),
2 =>
array(
'tile_id' => '3',
'tile_type' => '4',
'title' => 'Methods of Brewing',
'topicNum' => '2',
'topicTitle' => 'Beer',
'subNum' => NULL,
),
3 =>
array(
'tile_id' => '4',
'tile_type' => '11',
'title' => 'Beer Styles',
'topicNum' => '2',
'topicTitle' => 'Beer',
'subNum' => '',
),
);
I want to convert this array into individual arrays named 'tile_id' , 'tile_type' , ....
Currently I am doing it the following way !
$tile_id = [];
$tile_type = [];
$title = [];
$topicNum = [];
$topicTitle= [];
$subNum = [];
foreach($hos_pabsl as $val){
array_push($tile_id, $val['tile_id']);
array_push($tile_type, $val['tile_type']);
array_push($title, $val['title']);
array_push($topicNum, $val['topicNum']);
array_push($topicTitle, $val['topicTitle']);
array_push($subNum, $val['subNum']);
}
Problem 1: IS this the most efficient way (in terms of speed) to do this operation?
Problem 2:
The $hos_pabsl array's index (or keys) are always going to be sequential. However, my problem is that for second array (at level 2 OR $hos_pabsl[0]) the index (or keys) might increase or decrease.
E.g. all arrays in might have only 2 items 'tile_id' & 'title'. OR might have one extra item 'description'. So how can I make the above operation dynamic ?
To Solve problem 2, I have thought of using array_keys to extract names first $names = array_keys($hos_pabsl[0]) then using those names as array names like ${$names[0]} =[]. Again I don't think this is the right/efficient way to do this.
Any guidance on this would be really appreciated.

Answer 1

If you're running PHP 5.5, then you can use array_column()
$tile_id = array_column($hos_pabsl, 'tile_id');
$tile_type = array_column($hos_pabsl, 'tile_type');
... etc
for versions of PHP earlier than 5.5, you can use array_map()
$tile_id = array_map(
function ($value) { return $value['tile_id']; }, $hos_pabsl
);
$tile_type = array_map(
function ($value) { return $value['tile_type']; }, $hos_pabsl
);
... etc

Answer 2

To go with Mark Baker's answer since I was already typing it:
foreach(array_keys(reset($hos_pabsl)) as $key) {
$$key = array_column($hos_pabsl, $key);
}

Answer 3

In terms of performance if the array is huge using a for instead of a foreach it will be faster.
$tile_id = array();
$tile_type = array();
$title = array();
$topicNum = array();
$topicTitle = array();
$subNum = array();
$hos_pabsl_sz = count($hos_pabsl);
for ($i = 0; $i < $hos_pabsl_sz; ++$i ) {
$tile_id[$i] = $hos_pabsl[$i]['tile_id'];
$tile_type[$i] = $hos_pabsl[$i]['tile_type'];
$title[$i] = $hos_pabsl[$i]['title'];
$topicNum[$i] = $hos_pabsl[$i]['topicNum'];
$topicTitle[$i] = $hos_pabsl[$i]['topicTitle'];
$subNum[$i] = $hos_pabsl[$i]['subNum'];
}