Add ignore-platform-reqs option to require command

src/Composer/Command/RequireCommand.php

@@ -44,6 +44,7 @@ class RequireCommand extends InitCommand
                 new InputOption('no-update', null, InputOption::VALUE_NONE, 'Disables the automatic update of the dependencies.'),
                 new InputOption('update-no-dev', null, InputOption::VALUE_NONE, 'Run the dependency update with the --no-dev option.'),
                 new InputOption('update-with-dependencies', null, InputOption::VALUE_NONE, 'Allows inherited dependencies to be updated with explicit dependencies.'),
+                new InputOption('ignore-platform-reqs', null, InputOption::VALUE_NONE, 'Ignore platform requirements (php & ext- packages).'),
             ))
             ->setHelp(<<<EOT
 The require command adds required packages to your composer.json and installs them
@@ -131,6 +132,7 @@ EOT
             ->setUpdate(true)
             ->setUpdateWhitelist(array_keys($requirements))
             ->setWhitelistDependencies($input->getOption('update-with-dependencies'))
+            ->setIgnorePlatformRequirements($input->getOption('ignore-platform-reqs'))
         ;
 
         $status = $install->run();