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<?php function foo($a, $b = NULL, $c) {} $rf = new ReflectionFunction('foo'); var_dump($rf->getParameters()[0]->isOptional()); var_dump($rf->getParameters()[1]->isOptional()); var_dump($rf->getParameters()[2]->isOptional());
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Optional parameter $b declared before required parameter $c is implicitly treated as a required parameter in /in/je9fe on line 3 bool(false) bool(false) bool(false)

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