Appendix A. A Zend API Reference

A A Zend API Reference

AT THE CORE OF THE ZEND ENGINE ARE TWO FUNDAMENTAL SETS of APIs. The first is instruction processing, which includes script tokenization, compilation, and execution, as well as generating and handling function calls and object instantiation and destruction. The second set of APIs revolves around the manipulation of variables, or as you've come to know them, zvals. In this appendix you'll look at the functions and macros exported by the Zend Engine that simplify these operations and make them nearly consistent across all versions of PHP.