Beginner's introduction: The Core zend_php Foundation of PHP4

The name of the Zend engine is a combination of the name of the Zeev Suraski and Andi Gutmans Two senior designers who work in PHP as core developers. The development of the target architect to develop new scripting execution mechanisms, and PHP4 is the first implementation of this new Zend engine. In some special test environment, Zend (php$) speed than PHP3 and ASP faster than several times to hundreds of times times, which also means that the Web site's back-end CGI interface is not the unification of PHP4 Zend. (Of course, technology is progressing, and maybe there's a new engine on the day.) ）
After more than two years of research and development, the Zend engine has become a generalized programming environment similar to VBA, which not only has traditional PHP function functions, but also increases the functionality of Distributed objects (COM) and can be executed on different operating platforms. With this potential development, the Terminator of VBA is not Zend.
Zend in the PHP4 on the implementation of the PHP3 before the biggest disappointment of the session made the most complete commitment, while adding some future functions, such as CyberCash ... Wait a minute.
Php/zend is the best example of a opensource community in which the only thing that keeps momentum but has not yet been seen by Microsoft as a competitor. It has completely left the ASP behind, is going to the environment of VBA development. Microsoft is only trying to deal with Linux, without noticing the threat from php/zend.
The Web server discovers PHP requirements, requires the PHP engine to parse (according to the file extension), and sends it to the PHP4 Zend engine.
The Zend engine reads the file from the hard disk and sends it to the Zend-line compiler (Run-time Compiler) to work on the literal translation. (perhaps later Zend compiler out of the line can be omitted to compile work.) ）
The Zend Engine's online execution unit (excutor) executes the compiled PHP program. And when needed to find the relevant modules to perform collaborative action (such as XML,IMAP,ODBC ...) etc.).
Zend The executed results into an HTML file and gives it to the Web server.
The Web server passes the results over the network and returns the user's browser.
The current Zend products have the following four kinds:
The Zend Engine:zend engine Zend engine currently only makes PHP4 a product that provides similar VBA and cross-platform features like Microsoft. And the current popularity on the internet, but also for the Zend engine made the best witness. In the four products of Zend, this is the only mature product at present.
Zend optimizer:zend The core of PHP to readjust, so that PHP program execution more efficient. Mainly to speed up the execution of PHP code and reduce the burden of the CPU, the latency will be reduced.
Zend Cache:zend fast access to the PHP program to the memory of the Web server, so that the system does not have to read from the hard disk PHP program, can greatly shorten the system response time, reduce network load. The existence of the cache data can not even be translated, reduce the processing of resources.
Zend Compiler:zend Compiler This is probably the ultimate weapon of Zend, which allows PHP's program code to be compiled in the form of Zend Middle code (zic,zend Intermediate code).
    can protect the source code of PHP, do not let users see, so that PHP source code has security. It is expected that this product will have a large impact on the entire network, PHP code of the object library will be everywhere, the software industry will also provide the relevant function library or object library to the PHP programmer. There may be a PHP vs. Java scenario.