PHP Startup Unable to load dynamic library /usr/lib/php/20151012/php_mysqli.dll

问题

I have ubuntu 14.04 EC2 instance. I have installed php 7 on it. when I execute any php command like php --version or any other. I get following error

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20151012/php_mysqli.dll' - /usr/lib/php/20151012/php_mysqli.dll: cannot open shared object file: No such file or directory in Unknown on line 0

I have tried following

enable php_mysqli.dll in php.ini
enable mysqli.so
enable php_mysqli.so
sudo apt-get install php-mysql

but nothing worked for me.

Any suggestion how I can solve this?

回答1:

If you are on Linux, you shouldn't have DLL files but SO files. So first, you have to remove / disable the php_mysqli.dll you added in php.ini.

In order to use mysqli, you should then :

install the package for Ubuntu : apt-get install php-mysql
check if it is already enabled (with phpinfo() for example)
if not enabled, enable the module - check in /etc/php/mods-available/ folder if there is a mysqli.ini, containing extension=mysqli.so, then check for CLI / FPM / Apache / other if there is the symbolic link pointing to this file (for example for CLI, in /etc/php/cli/conf.d/ : 20-mysqli.ini -> ../../mods-available/mysqli.ini)
restart php / apache / nginx depending what you are using

回答2:

In my case it happened because i uncommented the extension=php_mysqli.dll line in php.ini file for running some other package. After googling around i found that you should not uncomment anything directly from php.ini instead you should install the required php extension and it will do the rest.

回答3:

I have recently encountered this problem on ubuntu16.04, I finally resolve it by adding a semi-colon at each line like extension=php_*.dll,I think that is because LAMP on ubuntu is intelligent enough，it automatically opens all of the extensions for us. And on windows,we have to enable the extensions manually by remove the semi-colon at each line like ;extension=php_*.dll in php.ini.

回答4:

Just comment out all lines with .dll extensions because you are on Ubuntu. Ubuntu support .so files.

回答5:

Run Phpinfo() Search for your php.ini path

search extension=php_mysqli.so

comment like this

;extension=php_mysqli.so

回答6:

If you see mcrypt.so under /etc/php/7.2 or /etc/php/7.3 just delete it and restart the server it will resolve the issue. As when we updrage the php to latest version that file may get stored to latest versions which is not required.

I used following commands:

cd /etc/php/7.3

sudo rm -rf mcrypt.so

sudo service apache2 restart

回答7:

I just had the same problem and realised they were two folders in my /etc/php/7.0, which were apache2 and cli. Turned out the extension line in cli/php.ini was uncommented with the dll file, not the one in apache2 directory. Commenting it just solved the problem.