Why does PHP not throw an error when I pass too many parameters to a function?

It is not wrong to pass more arguments to a function than needed.

You only get error if you pass to few arguments.

function test($arg1) {
 var_dump($arg1);
}

test();

Above will result in following error:
Uncaught ArgumentCountError: Too few arguments to function...

If you want to fetch first argument plus all others arguments passed to function you can do:

function test($arg1, ...$args) {
 var_dump($arg1, $args);
}

test('test1', 'test2', 'test3');

Resulting in:
string(5) "test1" array(2) { [0]=> string(5) "test2" [1]=> string(5) "test3" }

PHP doesn't throw an error on function overload.

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