如何在官方 php:7.4 docker 图像上启用 mysqli

Question

I have tried to enable mysqli on the official php docker image by writing and using a custom Dockerfile, like so:

FROM php:7.4

RUN docker-php-ext-install mysqli

However, the docker-php-ext-install command fails with the following error:

PHP Warning:  PHP Startup: Unable to load dynamic library 'php_mysqli.so' (tried: /usr/local/lib/php/extensions/no-debug-non-zts-20190902/php_mysqli.so (/usr/local/lib/php/extensions/no-debug-non-zts-20190902/php_mysqli.so: cannot open shared object file: No such file or directory), /usr/local/lib/php/extensions/no-debug-non-zts-20190902/php_mysqli.so.so (/usr/local/lib/php/extensions/no-debug-non-zts-20190902/php_mysqli.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

How do i enable mysqli on the official php docker image? And if mysqli is supposed to replace other deprecated php functions for connecting and using mysql, why is it not enabled by default?

Answer 1

Try to install mysql:

RUN apt-get -y install php7.4-mysql

If you use docker-php-ext-install , it is necessary to install the PHP package.