5 Notes

Overriding opcode handlers can be used for various purposes other than operator overloading. For example, when you are implementing a profiler, you may want to create a custom handler for ZEND_INIT_FCALL and ZEND_RETURN.

However, every coin has two sides. Overriding opcode handlers can damage overall performance of your PHP script, as additional handler functions are called every time when executing a hooked opcode.