(PHP 4 >= 4.2.0, PHP 5, PHP 7) Checks if the object is of this class or has this class as one of its parents

(PHP 4, PHP 5, PHP 7) Returns an array comprising a function's argument list

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Check for any printable character which is not whitespace or an alphanumeric

(PHP 5 >= 5.2.0, PHP 7) Returns the filter ID belonging to a named filter

(PHP 5, PHP 7) Checks if method is protected

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Check for printable character(s)

(PHP 5 >= 5.2.0, PHP 7) Filters a variable with a specified filter

(PHP >= 5.4.0) Returns the scope associated to the closure

(PHP 5, PHP 7) Checks if function is disabled

(PHP 7) Gets the currently executing line of the generator