PHP loop over passing arguments to a function

Question

I have a function called array_sum_identical_keys() which adds (as a sum) array values of identical keys. I have X number of arrays called $array1 $array2 $array3 etc. all created from a loop earlier in the code.

Since I have X number of arrays, I need to create a loop which will add up all of the array values with my custom function array_sum_identical_keys(), given that I don't know how many arrays I have.

I need to pass each array as an argument to array_sum_identical_keys() like array_sum_identical_keys($array1, $array2, ...) but I need to do this within a loop, adding each argument every time the loop iterates.

In simpler terms: I need to add an argument to a function each time a loop iterates, but I need the function to just be called once, with all arguments.

What would be the best way to go about doing this?

I have an answer but post how you create arrays if you need more. — AbraCadaver
– AbraCadaver, Commented Dec 18, 2016 at 5:28
strore each array $array1, $array2 etc in an array itself. then pass that array as parameter to your method — Sayantan Das
– Sayantan Das, Commented Dec 18, 2016 at 5:28
The reference manual gives some good tips, php.net/manual/en/functions.arguments.php then scroll down to Variable-length argument lists. — user2417483
– user2417483, Commented Dec 18, 2016 at 5:30

AbraCadaver · Accepted Answer · 2016-12-18 05:27:29Z

2

Instead of creating separate arrays, create a multi-dimensional array in the loops that is an array of your arrays. Then just send that to call_user_func_array():

$result = call_user_func_array('your_func', $array);

answered Dec 18, 2016 at 5:27

AbraCadaver

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StevenW · Accepted Answer · 2016-12-18 05:46:37Z

0

If you'd rather not deal with variable length argument lists, and would rather create a solution from simple parts, then this sounds like a perfect use for the array_reduce. If your array_sum_identical_keys works for two input arrays, and you have all of your arrays bundled up into a multidimensional array $arrays, then you can simply put the following:

$arrays_summed = array_reduce($arrays, 'array_sum_identical_keys');

answered Dec 18, 2016 at 5:46

StevenW

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