Prevent unresolvable APP_URL (#240)

* Prevent unresolvable `APP_URL`

* formatting

Co-authored-by: Taylor Otwell <[email protected]>

Author: jessarcher

src/NewCommand.php

@@ -108,7 +108,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             if ($name !== '.') {
                 $this->replaceInFile(
                     'APP_URL=http://localhost',
-                    'APP_URL=http://'.strtolower($name).'.test',
+                    'APP_URL='.$this->generateAppUrl($name),
                     $directory.'/.env'
                 );
 
@@ -308,6 +308,30 @@ protected function verifyApplicationDoesntExist($directory)
         }
     }
 
+    /**
+     * Generate a valid APP_URL for the given application name.
+     *
+     * @param  string  $name
+     * @return string
+     */
+    protected function generateAppUrl($name)
+    {
+        $hostname = mb_strtolower($name).'.test';
+
+        return $this->canResolveHostname($hostname) ? 'http://'.$hostname : 'http://localhost';
+    }
+
+    /**
+     * Determine whether the given hostname is resolvable.
+     *
+     * @param  string  $hostname
+     * @return bool
+     */
+    protected function canResolveHostname($hostname)
+    {
+        return gethostbyname($hostname.'.') !== $hostname.'.';
+    }
+
     /**
      * Get the version that should be downloaded.
      *