php 相关模块备忘

在安装php的时候，不管是编译安装：

./configure --prefix=/usr/local/php --with-config-file-path=/usr/local/php/etc --with-mysql=/usr/local/mysql --with-mysqli=/usr/local/mysql/bin/mysql_config --with-iconv-dir --with-freetype-dir --with-jpeg-dir --with-png-dir --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-discard-path --enable-magic-quotes --enable-safe-mode --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --with-curlwrappers --enable-mbregex --enable-fastcgi --enable-fpm --enable-force-cgi-redirect --enable-mbstring --with-mcrypt --enable-ftp --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --without-pear --with-gettext --with-mime-magic

还是yum安装：

================================================================================
 Package              Arch           Version              Repository       Size
================================================================================
Installing:
 php                  x86_64         5.5.-.fc20         updates         2.6 M
Updating:
 php-bcmath           x86_64         5.5.-.fc20         updates           k
 php-devel            x86_64         5.5.-.fc20         updates         2.2 M
 php-gd               x86_64         5.5.-.fc20         updates           k
 php-imap             x86_64         5.5.-.fc20         updates           k
 php-ldap             x86_64         5.5.-.fc20         updates           k
 php-mbstring         x86_64         5.5.-.fc20         updates          k
 php-mcrypt           x86_64         5.5.-.fc20         updates           k
 php-pdo              x86_64         5.5.-.fc20         updates          k
 php-pgsql            x86_64         5.5.-.fc20         updates          k
 php-process          x86_64         5.5.-.fc20         updates           k
 php-soap             x86_64         5.5.-.fc20         updates          k
 php-xml              x86_64         5.5.-.fc20         updates          k
Updating for dependencies:
 php-cli              x86_64         5.5.-.fc20         updates         2.6 M
 php-common           x86_64         5.5.-.fc20         updates         1.0 M

安装的这些模块都是什么，干什么用的？ 
分别搜索之，备忘如下：

================================================================================
 Package              Arch           Version              Repository       Size
================================================================================
Installing:
 php                  PHP主程序
Updating:
 php-bcmath           高精度数学函数
 php-devel            PHP开发库
 php-gd               图形开发库
 php-imap             internet message access protocol,即网际网络信息存取协议
 php-ldap             轻量级目录访问协议(Lightweight Directory Access Protocol)
 php-mbstring         多字节字符串，比如：中文
 php-mcrypt          加密相关函数库
 php-pdo              PDO数据库操作库
 php-pgsql           PDO数据库操作库，pg数据库
 php-process         进程相关，具体不详
 php-soap             SOAP 简单对象访问协议
 php-xml             XML
 php-cli              php的命令行支持
 php-common

更多待补充：