Add the GD Library under centos7.5, and then the MySQL expansion library. There is no problem without the configuration of MySQL expansion. There is no MySQL expansion in phpinfo

centos7.5 Add below gd Library then mysql The expansion library is gone ,mysql The expanded configuration is no problem ,phpinfo It's just that there's nothing in it mysql expand .

php -v  An error is as follows ：

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysqli.so'

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so'

[[email protected]_0_14_centos modules]# php -v

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysqli.so' - libmysqlclient.so.18: cannot open shared object file: No such file or directory in Unknown on line 0

Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/mysqli.so' - libmysqlclient.so.18: 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.18: cannot open shared object file: No such file or directory in Unknown on line 0

Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so' - libmysqlclient.so.18: cannot open shared object file: No such file or directory in Unknown on line 0
PHP 5.4.16 (cli) (built: Nov  1 2019 16:04:20) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

If msyqli.so The configuration of is ok , Try unloading mysqli.so expand ,  Such as ：yum remove php-mysqli   ; Then refit php-mysqli ,

yum install -y php-mysqli  

restart php-fpm：

systemctl restart php-fpm  

restart nginx The server ：

systemctl restart nginx

php -v Check to see if there are any errors

All of the above are in centos7.5 Under the command line operation , Other systems are similar .

Re pass phpinfo.php Check for mysql expand , There is a problem solved .

It seems to be the system itself bug.