PHP Combine multiple array into one multidimensional associative array

Question

I have three arrays that I want to combine with a multidimensional associative array.

Original Array

$statiosnIds = [12, 17, 20, 32];
$distances   = [0, 2.5, 3.0, 6.2];
$orders      = [0, 1, 2, 3];

Result Looking

$data = [
    [
        'station_id' => 12,
        'distance'   => 0,
        'order'      => 0,
    ],
    [
        'station_id' => 17,
        'distance'   => 2.5,
        'order'      => 1,
    ],
    [
        'station_id' => 20,
        'distance'   => 3.0,
        'order'      => 2,
    ],
    [
        'station_id' => 32,
        'distance'   => 6.2,
        'order'      => 3,
    ]
];

I can do it using three for each loop, but I want to know if there is any better and more optimized way to achieve it.

Perhaps you just need one foreach loop and select values from other arrays by key. — Sergiy T.
– Sergiy T., Commented Jun 24, 2020 at 15:26
@SergiyT. thanks, I think I understood what you said. However, skapicic has an alternate solution. Thanks, and appreciate it. — Code Lover
– Code Lover, Commented Jun 24, 2020 at 15:33

skapicic · Accepted Answer · 2020-06-24 17:40:37Z

2

You could use array_map

The code would look something like

$data = array_map(function($a, $b, $c) {
   return ['station_id' => $a, 'distance' => $b, 'order' => $c]; 
}, $statiosnIds, $distances, $orders);

edited Jun 24, 2020 at 17:40

answered Jun 24, 2020 at 15:26

skapicic

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4 Comments

Code Lover Over a year ago

OMG you made it damn simple. It can't be simpler than this. I would appreciate if you can explain a bit. Thanks a lot.

skapicic Over a year ago

Ok, so array_map is a function that performs an action over a number of arrays (we can call that number n) and returns a new array. The number of arrays n must match the number of arguments passed to the callback function which in our case are $a, $b, $c. So when the callback function iterates over the all of the arrays we have passed it iterates from start to end and the function is no longer called once any of the arrays has been fully traversed. So in our case in the first iteration $a = reset($statiosnIds), $b = reset($distances), $c = reset($orders).

skapicic Over a year ago

When we return ['station_id' => $a, 'distance' => $b, 'order' => $c] from our callback function the value is returned to the new array that the array_map function has to return (in our case $data). So for each member of all of our arrays it will step onto the next member (if they exist in all 3 array) else it will exit and end the array_map callback.

Code Lover Over a year ago

Great, thanks a lot for explaining. It is quite clear and helpful.

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