trait_exists
Introduction
Variable and Type Related Extensions
PHP Manual

# Classkit

- Introduction
- Installing/Configuring
  - Requirements
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
- Classkit Functions
  - classkit_import — Import new class method definitions from a file
  - classkit_method_add — Dynamically adds a new method to a given class
  - classkit_method_copy — Copies a method from class to another
  - classkit_method_redefine — Dynamically changes the code of the given method
  - classkit_method_remove — Dynamically removes the given method
  - classkit_method_rename — Dynamically changes the name of the given method

trait_exists
Introduction
Variable and Type Related Extensions
PHP Manual