phplaraveldockeralpine-linux

Change a value in php.ini using docker with an alpine php image


I have a PHP application running on docker and based on php:7.3-alpine3.9

For a big form, I am posting more than 1000 inputs, and I not only I get the error

Warning: Unknown: Input variables exceeded 1000. To increase the limit change max_input_vars in php.ini. in Unknown on line 0`

but worst, only 1000 input are passed to the backend

So it looks like I'd need to change the max_input_vars in the php.ini, but how can I do that ?


Solution

  • Usually, there is some kind of configuration directory that is scanned for further files. Try to place a file containing your local settings there, like the following:

    php-ini-overrides.ini:

    max_input_vars = 20000
    

    in your Dockerfile:

    FROM php:7.3-alpine3.9
    
    # Project-specific ini settings
    COPY ./php-ini-overrides.ini /etc/php7/conf.d/
    

    Another way could be to mount that single file through a Docker volume (this keeps the container configuration cleaner and is more simple if you don't want to use a Dockerfile for other purposes; additionally, you don't need to update the container when changing the configuration, but only restart it):

    volumes:
      - ./php-ini-overrides.ini:/etc/php7/conf.d/php-ini-overrides.ini
    

    This will work the best way, as you don't have to modify any existing file or keep track of changes from the upstream container

    As a short hint: if the solution does not work directly, check whether you need to adjust the folder to put that file into. Another base image might place that folder to another location