.. _array_sum():-addition-is-not-supported-on-type-array:

array_sum(): Addition is not supported on type array
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Description
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array_sum() adds each element in the first argument, with each other. This is a valid operation for integers, floats, numeric strings, booleans and null, as they can be cast to numbers. 

This is not the case for arrays, objects, non-numeric strings or resources, which yield this warning, and are omitted in the operation.

Until PHP 8.3, the omission of invalid argument was a silent behavior.

Example
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.. code-block:: php

   <?php
   
   var_dump(array_sum([[]] )); // returns 0
   
   var_dump(array_sum([[], 3] )); // returns 3
   
   ?>

Solutions
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+ Filter out all values in the first argument not actually numeric: aka, they can't be cast to integer or float without error.
+ Filter out all arrays inside the first argument.

Related Error Messages
______________________

+ :ref:`array_product():-multiplication-is-not-supported-on-type-object`