array_product(): Multiplication is not supported on type array¶
Description¶
array_product() multiplies each element in the first argument, with each other. This is a valid operation for integer, 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¶
<?php
var_dump(array_product([[]] )); // returns 1
var_dump(array_product([[], 3] )); // returns 3
?>
Solutions¶
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.