Programming PHP

Sybase
This extension provides support for accessing Sybase database servers.
To use it, you must install the Sybase client libraries and compile PHP with the --withsybase[=DIR]
directive.
System V Semaphore and Shared Memory
These extensions provide System V–style semaphores and shared memory pools. Semaphores
allow you to limit the number of processes that can simultaneously use a resource
(such as a serial port), possibly even to one process at a time. Shared memory provides a
pool of memory that different processes can safely read from and write into, but it does not
provide safeguards against simultaneous accesses (that’s what the semaphores are for).
To use semaphores and shared memory, you must compile PHP with the --withsysvsem[=DIR]
(for semaphore support) and --with-sysvshm (for shared memory) directives.
vpopmail
The vpopmail extension provides an interface to the vpopmail POP server. It includes functions
to manage domains and users.
To use it, you must install vpopmail and compile PHP with the --with-vpopmail directive.
WDDX
These functions are intended for work with WDDX, an XML-based standard for
exchanging data between applications. See Chapter 11 for a detailed discussion of using
XML in PHP.
The WDDX library is not enabled by default. To use it, you must install the expat library
and compile PHP with the --with-xml[=DIR] and --enable-wddx directives.
XML Parser
XML (eXtensible Markup Language) is a data format for creating structured documents.
XML can be used to exchange data in a common format, or just as a simple and convenient
way of storing document information. This extension provides access to an eventbased
XML parser. See Chapter 11 for a detailed discussion of using XML in PHP.
To use the XML functions, you must install expat and compile PHP with the --withxml[=DIR]
directive.
468 | Appendix B: Extension Overview
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