php array_push() -> How not to push if the array already contains the value

Question

I am using the following loop to add items to an an array of mine called $liste. I would like to know if it is possible somehow not to add $value to the $liste array if the

Answer 1

Great answers are already present above, but if you have multiple array_push() all over your code, it would be a pain to write if(in_array()) statements every time.

Here's a solution that will shorten your code for that case: Use a separate function.

function arr_inserter($arr,$add){ //to prevent duplicate when inserting
    if(!in_array($add,$arr))
        array_push($arr,$add);
    return $arr;
}

Then in all your array_push() needs, you can call that function above, like this:

$liste = array();
foreach($something as $value){
    $liste = arr_inserter($liste, $value);
}

If $value is already present, $liste remains untouched.

If $value is not yet present, it is added to $liste.

Hope that helps.