Are Zend Server just APC and Apache grouped together in an installation?

I look at Zend Server (PE and CE) and see that it is just an interface for php.ini and automatically has Zend Optimizer, which is basically APC (on the right?) In it or if it really will be interesting for our development machine. Basically, Zend Server has some special sauce that I cannot get from open source caching software and which modules you would use to create something like that. Just get Apache, PHP and APC or use lighttpd with xcache?

EDIT: Is there an open source alternative?

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As always, with this type of product, the difference lies in support ( with SLA ) and packaging. It seems that Zend also put some nice interfaces.

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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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Zend Server has some interesting features. Zend Optimizer is slightly faster than APC, if I remember correctly. However, the most unique feature is probably the remote PHP debugger, which integrates with Zend Studio and Zend Studio for Eclipse. Similar solutions are available free of charge (xdebug is excellent), but none of them is the same well-planned graphical interface.

This is a stable and well supported package. Not recommended if you do not need support and warranty or if you are already using Zend Studio.

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