How to constraint compatibility with PHP without explicitly constraint all the depending packages

Question

I got this requirement in my composer.json:

\"php\": \">= 5.6\",
\"symfony/http-foundation\": \"^3.0\"

The problem with that co

Answer 1

If you want to make composer.lock compatible with PHP 5.6, you have at least two options to achieve that:

1. Use PHP 5.6 for composer update - you should be able to install multiple versions of PHP on your OS and run Composer like this:

   /path/to/php6.5 /path/to/composer update
   

2. Use platform settings in composer.json to force installation for specific version regardless PHP version used to run Composer commands:

   "config": {
       "platform": {
           "php": "5.6.38"
       }
   },