Merging two associative arrays [duplicate] - php

Question

This question already has answers here:
Restructure multidimensional array of column data into multidimensional array of row data [duplicate]
(3 answers)
Closed 5 years ago.
I have two arrays.
$a=array('caption'=>array('c one','c two'));
$b=array('photos'=>array('photo one','photo two'));
I want to merge into
Array (
[0] => Array (
[caption] => c one
[file] => photo one
)
[1] => Array (
[caption] => c two
[file] => photo two
)
)
or merge into
Array (
[0] => Array (
[0] => c one
[1] => photo one
)
[1] => Array (
[0] => c two
[1] => photo two
)
)
How do you do it?

Answer 1

The last case can be done by array_map function
$res = array_map(null, $a['caption'], $b['photos']);
demo

Answer 2

You can use a nested loop, and just keep track of your keys.
foreach ([$a, $b] as $array) {
foreach ($array as $text_key => $values) {
foreach ($values as $numeric_key => $value) {
$result[$numeric_key][$text_key] = $value;
}
}
}

Answer 3

If the arrays does not have more in common than the key values then this should work.
It loops one array and uses the key to grab the value from the other array.
$a=array('caption'=>array('c one','c two'));
$b=array('photos'=>array('photo one','photo two'));
Foreach($a['caption'] as $key => $capt){
$new[$key]['caption'] = $capt;
$new[$key]['photos'] = $b['photos'][$key];
}
Var_dump($new);
Output:
array(2) {
[0] => array(2) {
["caption"] => "c one"
["photos"] => "photo one"
}
[1] => array(2) {
["caption"] => "c two"
["photos"] => "photo two"
}
}
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