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www.it-ebooks.infoCHAPTER 6 • OBJECT-ORIENTED PHPCreating a Class AliasThe class_alias() function creates a class alias, allowing the class to be referred to by more than onename. Its prototype follows:boolean class_alias(string originalClassName, string aliasName)This function was introduced in PHP 5.3.Determining Whether a Class ExistsThe class_exists() function returns TRUE if the class specified by class_name exists within thecurrently executing script context and returns FALSE otherwise. Its prototype follows:boolean class_exists(string class_name)Determining Object ContextThe get_class() function returns the name of the class to which object belongs and returns FALSE ifobject is not an object. Its prototype follows:string get_class(object object)Learning about Class MethodsThe get_class_methods() function returns an array containing all method names defined by the classclass_name. Its prototype follows:array get_class_methods(mixed class_name)Learning about Class PropertiesThe get_class_vars() function returns an associative array containing the names of all properties andtheir corresponding values defined within the class specified by class_name. Its prototype follows:array get_class_vars(string class_name)Learning about Declared ClassesThe function get_declared_classes() returns an array containing the names of all classes defined withinthe currently executing script. The output of this function will vary according to how your PHPdistribution is configured. For instance, executing get_declared_classes() on a test server produces alist of 97 classes. Its prototype follows:array get_declared_classes(void)155