(PHP 4, PHP 5, PHP 7) Gets the class methods' names

(PHP 5 >= 5.4.0, PHP 7) Checks if the trait exists

(PHP 4, PHP 5, PHP 7) Get the default properties of the class

(PHP 4, PHP 5, PHP 7) Checks if the class has been defined

(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 with the name of the defined classes

(PHP 5 >= 5.3.0, PHP 7) the "Late Static Binding" class name

(PHP 4, PHP 5, PHP 7) Retrieves the parent class name for object or class

(PHP 5, PHP 7) Attempt to load undefined class

(PHP 4 >= 4.0.5, PHP 5) Call a user method given with an array of parameters