title: laravel Call to undefined function get()
body: <p>when i run a command in laravel project :</p>
  
  <pre><code> php artisan optimize                                                      
  
  [Symfony\Component\Debug\Exception\FatalErrorException]  
  Call to undefined function get()                         
  
  Script php artisan optimize handling the post-update-cmd event returned with an error
  
  
  [RuntimeException]  
  Error Output:       
  </code></pre>
  
  <p>and</p>
  
  <pre><code>php artisan clear-compiled
  
  
  [Symfony\Component\Debug\Exception\FatalErrorException]  
  Call to undefined function get()            
  </code></pre>
  
  <p>and </p>
  
  <pre><code>php artisan optimize --force
  
  
  [Symfony\Component\Debug\Exception\FatalErrorException]  
  Call to undefined function get()  
  </code></pre>
  
  <p>and</p>
  
  <p>{
      composer update
       Loading composer repositories with package information
      Updating dependencies (including require-dev)
       - Removing barryvdh/laravel-ide-helper (v2.1.4)
       - Removing symfony/class-loader (v3.1.0)
       Writing lock file
       Generating autoload files</p>
  
  <blockquote>
    <p>Illuminate\Foundation\ComposerScripts::postUpdate
    php artisan optimize</p>
  </blockquote>
  
  <pre><code>[Symfony\Component\Debug\Exception\FatalErrorException]  
  Call to undefined function get()                         
  
  
   Script php artisan optimize handling the post-update-cmd event returned with an error
  
  
   [RuntimeException]  
  Error Output:                   
  </code></pre>
  
  <p>}</p>
  
  <p>and my composer.json is </p>
  
  <pre><code>{
  "name": "laravel/laravel",
  "description": "The Laravel Framework.",
  "keywords": ["framework", "laravel"],
  "license": "MIT",
  "type": "project",
  "require": {
      "php": "&gt;=5.5.9",
      "laravel/framework": "5.2.*",
      "laravelcollective/html": "5.2.*"
  },
  "require-dev": {
      "fzaninotto/faker": "~1.4",
      "mockery/mockery": "0.9.*",
      "phpunit/phpunit": "~4.0",
      "symfony/css-selector": "2.8.*|3.0.*",
      "symfony/dom-crawler": "2.8.*|3.0.*"
  },
  "autoload": {
      "classmap": [
          "database"
      ],
      "psr-4": {
          "App\\": "app/"
      }
  },
  "autoload-dev": {
      "classmap": [
          "tests/TestCase.php"
      ]
  },
  "scripts": {
      "post-root-package-install": [
          "php -r \"copy('.env.example', '.env');\""
      ],
      "post-create-project-cmd": [
          "php artisan key:generate"
      ],
      "post-install-cmd": [
          "Illuminate\\Foundation\\ComposerScripts::postInstall",
          "php artisan optimize"
      ],
      "post-update-cmd": [
          "Illuminate\\Foundation\\ComposerScripts::postUpdate",
          "php artisan optimize"
      ]
  },
  "config": {
      "preferred-install": "dist"
  }
  </code></pre>
  
  <p>}</p>
  
  <p>so, what's wrong is it,and how can i fix it? thanks?</p>