Transpose an array of arrays [duplicate] - php

Question

This question already has answers here:
Transposing multidimensional arrays in PHP
(12 answers)
Closed 6 months ago.
Hah, I had no idea how else to phrase that. I'm trying to reformat a set of three arrays generated by form field inputs, into something that better matches my models, so I can save the values to the db.
Not sure if the solution should be some array manipulation or that I should change the "name" attribute in my form fields.
currently I have an array of my input data:
array(
'image_id' =>
array
0 => '454' (length=3),
1 => '455' (length=3),
2 => '456' (length=3)
'title' =>
array
0 => 'title1' (length=6),
1 => 'title2' (length=0),
2 => '' (length=6)
'caption' =>
array
0 => 'caption1' (length=8),
1 => '' (length=8),
2 => 'caption3' (length=8)
);
and would like to change it to something like, so I can iterate over and save each array of values to the corresponding resource in my db.
array(
0 =>
array
'image_id' => '454',
'title' => 'title1',
'caption' => 'caption1'
1 =>
array
'image_id' => '455',
'title' => 'title2',
'caption' => ''
2 =>
array
'image_id' => '456',
'title' => '',
'caption' => 'caption3'
);

Answer 1

This would iterate through the array with 2 foreach loops. They would use each other's key to construct the new array, so it would work in any case:
$data = array(
'image_id' => array(454, 455, 456),
'title' => array('title1', 'title2', ''),
'caption' => array('caption1', '', 'caption3')
);
$result = array();
foreach($data as $key => $value) {
foreach ($value as $k => $v) {
$result[$k][$key] = $v;
}
}

Answer 2

This'll do it:
$array = call_user_func_array('array_map', array_merge(
[function () use ($array) { return array_combine(array_keys($array), func_get_args()); }],
$array
));
Assuming though that this data is originally coming from an HTML form, you can fix the data right there already:
<input name="data[0][image_id]">
<input name="data[0][title]">
<input name="data[0][caption]">
<input name="data[1][image_id]">
<input name="data[1][title]">
<input name="data[1][caption]">
Then it will get to your server in the correct format already.