Zend Server has more features than APC + Apache. This is a PHP application server, this means:
- Monitoring PHP execution in a production environment; - PHP event code tracing (for debugging in a production environment, storing an executable stack of PHP code); - System debugging and profiles;
- Work queue (for managing the queue of PHP scripts, for planning the execution of PHP scripts);
- Java Bridge (to call Java classes from PHP);
- Page cache (for caching URLs based on the conditions of $ _GET, $ _SESSION, $ _SERVER, etc.); - Data cache (API for caching PHP variables (on disk or in RAM);
- PHP accelerator (PHP byte accelerator PHP, Zend + optimizer);
- PHP stack management (setting up PHP, extensions, etc.).
Zend Server Community Edition (CE) is a free version of Zend Server. In this version you only have:
- System debugging and profiles;
- Data cache (for example, APC); - PHP byte accelerator, Zend + optimizer (for example, APC);
- Java Bridge,
- PHP stack management.
For more information: http://www.zend.com/en/products/server/
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