Force composer to require PHP Version between Version X and Version Y

Question

we have a mix of different PHP versions running on your servers (max 5.3.5) and development machines (max 5.5.9).

Now we ran into the problem that we did a \"compose

Answer 1

Remove your composer.lock and vendor directory.

Now place platform option to composer.json

"config": {

    "platform": {
        "php": "7.0"
    }

},

and finally, run command composer install