What to do if php cannot connect to mysql under linux

Solution to the problem that php cannot connect to mysql under Linux: First open the terminal; then execute the [apt install php-mysql] command to install the php-mysql module; finally execute the [service apache2 restart] command to restart the server.

Cause analysis:

It may be that the php-mysql module is not installed.

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Solution:

First execute the following command to install the module:

apt install php-mysql

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Then execute the following command to restart the apache2 server.

service apache2 restart

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