我执行了各种yum安装命令并安装了所有的软件包。
[root@myip php.d]# rpm -qa | grep -i mysql mysql-server-5.1.69-1.el6_4.x86_64 mysql-libs-5.1.69-1.el6_4.x86_64 perl-DBD-MySQL-4.013-3.el6.x86_64 mysql-devel-5.1.69-1.el6_4.x86_64 mysql-5.1.69-1.el6_4.x86_64 php-mysql-5.3.3-22.el6.x86_64 但在phpinfo我可以看到所有的扩展名，如mssql，pgsql，mongo等，但不是mysql
我该怎么办
PHP pacakges
php-common-5.3.3-22.el6.x86_64 php-pdo-5.3.3-22.el6.x86_64 php-pgsql-5.3.3-22.el6.x86_64 php-pecl-imagick-2.2.2-4.el6.x86_64 php-zts-5.3.3-22.el6.x86_64 php-process-5.3.3-22.el6.x86_64 php-ldap-5.3.3-22.el6.x86_64 php-suhosin-0.9.29-2.el6.x86_64 php-enchant-5.3.3-22.el6.x86_64 php-fpm-5.3.3-22.el6.x86_64 php-cli-5.3.3-22.el6.x86_64 php-pear-1.9.4-4.el6.noarch php-odbc-5.3.3-22.el6.x86_64 php-pecl-memcached-1.0.0-1.el6.x86_64 php-pecl-xdebug-2.1.4-1.el6.x86_64 php-pecl-geoip-1.0.8-3.el6.x86_64 php-pecl-memcache-3.0.5-4.el6.x86_64 php-embedded-5.3.3-22.el6.x86_64 php-soap-5.3.3-22.el6.x86_64 php-snmp-5.3.3-22.el6.x86_64 php-bcmath-5.3.3-22.el6.x86_64 php-mbstring-5.3.3-22.el6.x86_64 php-imap-5.3.3-22.el6.x86_64 php-xmlrpc-5.3.3-22.el6.x86_64 php-gd-5.3.3-22.el6.x86_64 php-xml-5.3.3-22.el6.x86_64 php-recode-5.3.3-22.el6.x86_64 php-5.3.3-22.el6.x86_64 php-mssql-5.3.3-1.el6.x86_64 php-pecl-apc-3.1.9-2.el6.x86_64 php-pecl-mongo-1.4.0-1.el6.x86_64 php-tidy-5.3.3-22.el6.x86_64 php-mcrypt-5.3.3-1.el6.x86_64 php-dba-5.3.3-22.el6.x86_64 php-intl-5.3.3-22.el6.x86_64 php-pspell-5.3.3-22.el6.x86_64 php-php-gettext-1.0.11-3.el6.noarch php-mysql-5.3.3-22.el6.x86_64
假设你安装了php-MySQL，并假设你正在使用Apache，你可能只需要重启Apache（如果你还没有的话）。
我相信centos，那是：
$ sudo /etc/init.d/httpd restart