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I have a server where I have two versions of PHP installed (PHP-7.0 and PHP-7.1). I also have two sites one using magento2.1.5 (running PHP-7.0.18) and the other a Code Ignitor project(running PHP-7.1.6).
We all know magento2.1.5 is not compatible with PHP-7.1.6. I am compiling Magento projects using this and it works fine.
Now I need to use Composer, each time i run composer install it shows the following error:

Problem 1
- magento/composer 1.0.3 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.6) does not satisfy that requirement.
- magento/composer 1.0.3 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.6) does not satisfy that requirement.
- Installation request for magento/composer 1.0.3 -> satisfiable by magento/composer[1.0.3].

Any solution would be appreciated...

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You can tell composer to ignore the platform requirements by adding the --ignore-platform-reqs parameter in composer install, composer update etc.

Or you can specify the used production version in your projects composer.json with the "platform" parameter:

"config": {
  "platform": {
    "php": "7.0.18"
  }
}

This way you also ensure that composer update only installs packages that are compatible with PHP 7.0

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  • does this create any side-effects later – Krishna Chalise Jun 30 '17 at 13:17
  • @Wildfire it's possible that composer installs packages that require php 7.1 when running composer update with that parameter. To avoid this, use platform (see updated answer) – Fabian Schmengler Jun 30 '17 at 13:18
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Could you please check in composer.json for below line

"require": {
        "php": "~5.5.0|~5.6.0|~7.0.0"

Change the above line to 

"require": {
        "php": "~5.5.0|~5.6.0|~7.0.0|~7.1.0"

Then run the composer install.

I hope it will works... Try it..

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1
  • 1
    theres no such line in my composer.json – Krishna Chalise Jun 30 '17 at 13:15

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