Add --ignore-platform-reqs to create-project, refs #1426

doc/03-cli.md

@@ -467,6 +467,9 @@ By default the command checks for the packages on packagist.org.
 * **--keep-vcs:** Skip the deletion of the VCS metadata for the created
   project. This is mostly useful if you run the command in non-interactive
   mode.
+* **--ignore-platform-reqs:** ignore `php`, `hhvm`, `lib-*` and `ext-*`
+  requirements and force the installation even if the local machine does not
+  fulfill these.
 
 ## dump-autoload
 

src/Composer/Command/CreateProjectCommand.php

@@ -69,6 +69,7 @@ class CreateProjectCommand extends Command
                 new InputOption('no-progress', null, InputOption::VALUE_NONE, 'Do not output download progress.'),
                 new InputOption('keep-vcs', null, InputOption::VALUE_NONE, 'Whether to prevent deletion vcs folder.'),
                 new InputOption('no-install', null, InputOption::VALUE_NONE, 'Whether to skip installation of the package dependencies.'),
+                new InputOption('ignore-platform-reqs', null, InputOption::VALUE_NONE, 'Ignore platform requirements (php & ext- packages).'),
             ))
             ->setHelp(<<<EOT
 The <info>create-project</info> command creates a new project from a given
@@ -125,11 +126,12 @@ EOT
             $input->getOption('keep-vcs'),
             $input->getOption('no-progress'),
             $input->getOption('no-install'),
+            $input->getOption('ignore-platform-reqs'),
             $input
         );
     }
 
-    public function installProject(IOInterface $io, Config $config, $packageName, $directory = null, $packageVersion = null, $stability = 'stable', $preferSource = false, $preferDist = false, $installDevPackages = false, $repositoryUrl = null, $disablePlugins = false, $noScripts = false, $keepVcs = false, $noProgress = false, $noInstall = false, InputInterface $input)
+    public function installProject(IOInterface $io, Config $config, $packageName, $directory = null, $packageVersion = null, $stability = 'stable', $preferSource = false, $preferDist = false, $installDevPackages = false, $repositoryUrl = null, $disablePlugins = false, $noScripts = false, $keepVcs = false, $noProgress = false, $noInstall = false, $ignorePlatformReqs = false, InputInterface $input)
     {
         $oldCwd = getcwd();
 
@@ -159,7 +161,8 @@ EOT
             $installer->setPreferSource($preferSource)
                 ->setPreferDist($preferDist)
                 ->setDevMode($installDevPackages)
-                ->setRunScripts( ! $noScripts);
+                ->setRunScripts(!$noScripts)
+                ->setIgnorePlatformRequirements($ignorePlatformReqs);
 
             if ($disablePlugins) {
                 $installer->disablePlugins();