没有MySQL选项：
思路首选想到httpd:
一些问题都会从日志中反映出来：
# tail -f error_log
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so' - libmysqlclient.so.16: cannot open shared object file: No such file or directory in Unknown on line 0
[Fri May 26 19:33:13 2017] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 configured -- resuming normal operations
[Fri May 26 19:44:17 2017] [notice] caught SIGTERM, shutting down
[Fri May 26 19:44:17 2017] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Fri May 26 19:44:17 2017] [notice] Digest: generating secret for digest authentication ...
[Fri May 26 19:44:17 2017] [notice] Digest: done
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysql.so' - libmysqlclient.so.16: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysqli.so' - libmysqlclient.so.16: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so' - libmysqlclient.so.16: cannot open shared object file: No such file or directory in Unknown on line 0
[Fri May 26 19:44:17 2017] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 configured -- resuming normal operations# rpm -qf /usr/lib64/perl5/auto/DBD/mysql/mysql.so
perl-DBD-MySQL-4.013-3.el6.x86_64# yum install perl-DBD-MySQL.x86_64# /etc/init.d/httpd restart
问题解决：
