most likely reason for your PHP installation, however,
Determining Configuration Options and Extensions PHP itself comes with a large list of features for you to utilize. However, there are additional features you can enable by using PHP extensions. An extension is a group of functions and rou- tines that are considered extra in that you have to manually enable them during installation. Usually, extensions require additional software installed before you can enable them. Compiling extensions for PHP can be tricky. We recommend that if you do not need it, do not install it. A common problem with most pre-built packages for PHP is that they come with every extension installed; this reduces performance and, more important, could lead to a vul- nerable system. If you can relate enabling extensions in PHP to opening ports on your system firewall that are not needed, you will have a better picture of what we mean. Now that we have those concerns out of the way, let s take a look at some of the common configuration directives and extensions available for PHP. Keep in mind that because of the extremely long list of directives, we are covering only the most commonly used ones. Common Configuration Directives –prefix= PREFIX This tells PHP to install all architecture-independent files into the supplied directory location. By default this directory is /usr/local . –help This prints a list of configuration directives. –no-create This does not create output files. –quiet, –silent This tells the compiler not to print checking messages. –version This prints the version of autoconf that created the configure file. Features and Packages The following list details the flags used to enable, disable, and include or not include features and packages in your PHP compilation. –disable- FEATURE Do not include FEATURE (same as –enable- FEATURE =no ). –enable- FEATURE [= ARG ] Include FEATURE [ARG=yes] . –with- PACKAGE [= ARG ] Use PACKAGE [ARG=yes]. –without- PACKAGE Do not use PACKAGE (same as –with- PACKAGE =no ). Server Application Programming Interface (SAPI) SAPI extensions handle interaction with the web server. Because this book is written for the Apache web server, we will cover only the applicable extensions.
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