Comment 8 for bug 1605127

On further inspection, it looks like having an mismatched function declaration in a child class results in an E_WARNING message in PHP7, not a fatal error. (See http://php.net/manual/en/migration70.incompatible.php#migration70.incompatible.error-handling.strict )

And although that page seems to imply that it would generate an E_STRICT message in PHP5, I'm not seeing any such E_STRICT in my testing, no matter what I set my error level to.