PHP how to combine array and create new array - php

Question

I have 3 arrays like this :
$first = array(
[0] => 13
[1] => 66
[2] => 15
)
$second = array
(
[0] => append
[1] => prepend
[2] => append
)
$third = array
(
[0] => 2
[1] => 4
[2] => 1
)
Now I want to combine these 3 array and create new SINGLE array like this :
I want to get value from each array and combine it into one.
$new_array = array(
[0] = array (
'page'=>13,
'position'=>'append'
'priority'=>'2'
)
[1] = array (
'page'=>66,
'position'=>'prepend'
'priority'=>'4'
)
[2] = array (
'page'=>15,
'position'=>'append'
'priority'=>'1'
)
)
How to do this ?

Answer 1

You can use array_map() to traverse multiple arrays(of the same length) and build a new array from them, item by item:
$first = array(13, 66, 15);
$second = array('append', 'prepend', 'append');
$third = array(2, 4, 1);
print_r(
array_map(
function($page, $position, $priority) {
return compact('page', 'position', 'priority');
},
$first,
$second,
$third
)
);
Though in this case with a trivial structure foreach() might be an alternative.
Edit: Version 2. Some might argue that this is worse because of readability and hence code maintainability. Thanks to AbraCadaver
$keys = ['page', 'position', 'priority'];
// Note: The order in $keys and array_map() arguments must be the same
// On the other hand you only need to type the keys once and it's easy
// to change the number of arguments :)
print_r(
array_map(
function(...$args) use ($keys) {
return array_combine($keys, $args);
},
$first,
$second,
$third
)
);
Edit: Version 3. Using slightly more modern PHP (7.4) with arrow functions:
print_r(
array_map(
fn(...$args) => array_combine($keys, $args),
$first,
$second,
$third
)
);

Answer 2

Just map each element of each array and return an array with the keys:
$result = array_map(function($f, $s, $t) {
return ['page'=>$f, 'position'=>$s, 'priority'=>$t];
}, $first, $second, $third);
Or define the keys outside of the function and combine with each element:
$keys = ['page', 'position', 'priority'];
$result = array_map(function($f, $s, $t) use($keys) {
return array_combine($keys, [$f, $s, $t]);
}, $first, $second, $third);

Answer 3

If you have same column, you can do it like this
$first = [13,66,15];
$second = ['append','prepend','append'];
$third = [2,4,1];
foreach($first as $v => $i){
$new_array[] = [
'page' => $i,
'position' => $second[$v],
'priority' => $third[$v],
];
}
print_r($new_array);
this is the result