php array index entries auto populate

Question

I have two arrays

$arrayOne = ( [0] => 4892 [1] => 98508 [2] => 7834 [3] => 47826 )
$arrayTwo = ( [1] => Car [2] => Computer )

Notice the elements of arrayTwo does not start at 0, but which is what i want because it will be used to pair with arrayOne, ie. Car matches with 98508.

I want to populate the second array where there are no entries with a string for example arrayTwo output:

$arrayTwo = ([0] => its empty [1] => Car [2] => Computer [3] => its empty

How can i achieve this desired output?

$arrayTwo = [null,'Car','Computer',null]; doesn't work for you? — IncredibleHat
– IncredibleHat, Commented Feb 22, 2018 at 18:52
Get the existing keys from arrayOne (php.net/manual/en/function.array-keys.php). Loop on that. If arrayTwo does not have the index, add it = empty. If it`s there do nothing. Try it out, post some code here if you are stuck. Or loop using foreach. — Nic3500
– Nic3500, Commented Feb 22, 2018 at 18:53
@IncredibleHat i would like to input a string where there are no entries — jumpman8947
– jumpman8947, Commented Feb 22, 2018 at 18:54
FYI, while providing answers is nice, getting him to work it out is better, IMHO. — Nic3500
– Nic3500, Commented Feb 22, 2018 at 18:55

AbraCadaver · Accepted Answer · 2018-02-22 18:54:08Z

1

Loop the first and check for the key. If it doesn't exist, set it:

foreach($arrayOne as $key => $val) {
    if(!isset($arrayTwo[$key])) { $arrayTwo[$key] = 'its empty'; }
}

answered Feb 22, 2018 at 18:54

AbraCadaver

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Michael Rodriguez · Accepted Answer · 2018-02-22 19:00:46Z

0

foreach ($arrayOne as $key => $value){

    if (!array_key_exists($key, $arrayTwo)){
        $arrayTwo[$key] = 'its empty';
    }

}

edited Feb 22, 2018 at 19:00

answered Feb 22, 2018 at 18:54

Michael Rodriguez

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