__autoload-attempting to load an undefined class
call_user_method_array-invokes a user method, passing a parameter array (deprecated)
Call_user_method-invoking a user method on a specific object (deprecated)
class_alias-Creating an alias for a class
class_exists-checking whether a class is defined
get_called_class-Late static binding ("late static binding") class name
get_class_methods-returns an array of the method names of the class
get_class_vars-returns an array that consists of the default properties of the class
get_class-returns the class name of the object
get_declared_classes-returns an array consisting of the names of the defined classes
get_declared_interfaces-returns an array containing all the declared interfaces
get_declared_traits-returns an array of all defined traits
get_object_vars-returns an associative array consisting of object properties
get_parent_class-returns the parent class name of an object or class
interface_exists-Check if the interface has been defined
is_a-returns TRUE if the object belongs to the class or if the class is the parent class of this object
is_subclass_of-returns TRUE If this object is a subclass of the class
method_exists-checking the existence of a class's methods
property_exists-checking whether an object or class has this property
trait_exists-checks if the specified trait exists
PHP Class/Object functions