再问一个问题：通常在安装php的时候，有没有将php的mysql扩展安装进去呢？我最近在安装一个php应用系统时，总是提示我说没有安装php的mysql扩展安装，可我在安装的时候已经指定了mysql的安装路径，如下：./configure --prefix=/usr/local/php --with-apxs2=/usr/local/apache2/bin/apxs --with-xml --with-mysql=/usr/local/mysql --with-zlib --with-jpeg-dir=/usr/local/jpeg6 --with-png-dir=/usr/local/libpng2 --with-gd=/usr/local/gd2 --with-config-file-path=/usr/local/lib --disable-debug --enable-safe-mode --enable-trans-sid --enable-memory-limit --enable-short-tags --disable-posix --enable-exif --enable-ftp --enable-sockets --enable-mbstring --enable-track-vars --with-openssl=/usr/share/ssl --with-curl=/usr/include/curl --with-iconv