因为删除了mysql，发现会引起很多警告，如下
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626+lfs/gd.so' - /usr/lib/php5/20090626+lfs/gd.so: 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/lib/php5/20090626+lfs/mcrypt.so' - /usr/lib/php5/20090626+lfs/mcrypt.so: 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/lib/php5/20090626+lfs/mysql.so' - /usr/lib/php5/20090626+lfs/mysql.so: 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/lib/php5/20090626+lfs/mysqli.so' - /usr/lib/php5/20090626+lfs/mysqli.so: 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/lib/php5/20090626+lfs/pdo_mysql.so' - /usr/lib/php5/20090626+lfs/pdo_mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0
注释掉 /etc/php/conf.d/下所有的配置文件中的内容即可。
xjzhou:php$ sudo vim /etc/php5/conf.d/
curl.ini gd.ini mcrypt.ini mysqli.ini mysql.ini pdo.ini pdo_mysql.ini
xjzhou:php$ sudo vim /etc/php5/conf.d/gd.ini
xjzhou:php$ sudo vim /etc/php5/conf.d/mcrypt.ini
xjzhou:php$ sudo vim /etc/php5/conf.d/mcrypt.ini
xjzhou:php$ sudo vim /etc/php5/conf.d/pdo.ini
xjzhou:php$ sudo vim /etc/php5/conf.d/pdo
例如mysqli.ini
; configuration for php MySQL module
; extension=mysqli.so