advanced patterns with PHP 8.1 type declarations causing implementing array inputs in a custom function
I'm getting frustrated with I'm stuck on something that should probably be simple. After trying multiple solutions online, I still can't figure this out. I'm working with an unexpected behavior with PHP 8.1 regarding type declarations in a custom function. I have a utility function that is supposed to accept an array of integers, but when I pass an array that contains non-integer values, it seems to generate a fatal behavior rather than a graceful handling of the situation. Here’s my function: ```php function processNumbers(array $numbers): int { $sum = 0; foreach ($numbers as $number) { if (!is_int($number)) { throw new InvalidArgumentException('All elements must be integers.'); } $sum += $number; } return $sum; } ``` When I call this function with the following input: ```php $result = processNumbers([1, 2, 'three', 4]); ``` I receive a fatal behavior: `Uncaught TypeError: Argument 1 passed to processNumbers() must be of the type array, array given`. I expected it to throw the `InvalidArgumentException` instead. I checked the function call and the array type is correct as per PHP’s feedback. I also verified that the behavior does occur before it reaches the validation check inside the function. I’ve tried adding explicit checks for the input type before the function call, like so: ```php if (!is_array($input)) { throw new InvalidArgumentException('Input must be an array.'); } ``` But it doesn’t seem to help in terms of preventing the behavior. Is there a way to handle mixed-type arrays in PHP 8.1 with type declarations without causing a fatal behavior? Any insights or best practices for this scenario would be greatly appreciated! This is part of a larger application I'm building. What am I doing wrong? This is for a application running on Linux. Any suggestions would be helpful. I'm coming from a different tech stack and learning Php. Is this even possible?