<?php
  /**
   * Application requirement checker script.
   *
   * In order to run this script use the following console command:
   * php requirements.php
   *
   * In order to run this script from the web, you should copy it to the web root.
   * If you are using Linux you can create a hard link instead, using the following command:
   * ln ../requirements.php requirements.php
   */
  
  // you may need to adjust this path to the correct Yii framework path
  // uncomment and adjust the following line if Yii is not located at the default path
  //$frameworkPath = dirname(__FILE__) . '/vendor/yiisoft/yii2';
  
  
  if (!isset($frameworkPath)) {
      $searchPaths = array(
          dirname(__FILE__) . '/vendor/yiisoft/yii2',
          dirname(__FILE__) . '/../vendor/yiisoft/yii2',
      );
      foreach ($searchPaths as $path) {
          if (is_dir($path)) {
              $frameworkPath = $path;
              break;
          }
      }
  }
  
  if (!isset($frameworkPath) || !is_dir($frameworkPath)) {
      $message = "<h1>Error</h1>
  
  "
          . "<p><strong>The path to yii framework seems to be incorrect.</strong></p>
  "
          . '<p>You need to install Yii framework via composer or adjust the framework path in file <abbr title="' . __FILE__ . '">' . basename(__FILE__) . "</abbr>.</p>
  "
          . '<p>Please refer to the <abbr title="' . dirname(__FILE__) . "/README.md\">README</abbr> on how to install Yii.</p>
  ";
  
      if (!empty($_SERVER['argv'])) {
          // do not print HTML when used in console mode
          echo strip_tags($message);
      } else {
          echo $message;
      }
      exit(1);
  }
  
  require_once($frameworkPath . '/requirements/YiiRequirementChecker.php');
  $requirementsChecker = new YiiRequirementChecker();
  
  $gdMemo = $imagickMemo = 'Either GD PHP extension with FreeType support or ImageMagick PHP extension with PNG support is required for image CAPTCHA.';
  $gdOK = $imagickOK = false;
  
  if (extension_loaded('imagick')) {
      $imagick = new Imagick();
      $imagickFormats = $imagick->queryFormats('PNG');
      if (in_array('PNG', $imagickFormats)) {
          $imagickOK = true;
      } else {
          $imagickMemo = 'Imagick extension should be installed with PNG support in order to be used for image CAPTCHA.';
      }
  }
  
  if (extension_loaded('gd')) {
      $gdInfo = gd_info();
      if (!empty($gdInfo['FreeType Support'])) {
          $gdOK = true;
      } else {
          $gdMemo = 'GD extension should be installed with FreeType support in order to be used for image CAPTCHA.';
      }
  }
  
  /**
   * Adjust requirements according to your application specifics.
   */
  $requirements = array(
      // Database :
      array(
          'name' => 'PDO extension',
          'mandatory' => true,
          'condition' => extension_loaded('pdo'),
          'by' => 'All DB-related classes',
      ),
      array(
          'name' => 'PDO SQLite extension',
          'mandatory' => false,
          'condition' => extension_loaded('pdo_sqlite'),
          'by' => 'All DB-related classes',
          'memo' => 'Required for SQLite database.',
      ),
      array(
          'name' => 'PDO MySQL extension',
          'mandatory' => false,
          'condition' => extension_loaded('pdo_mysql'),
          'by' => 'All DB-related classes',
          'memo' => 'Required for MySQL database.',
      ),
      array(
          'name' => 'PDO PostgreSQL extension',
          'mandatory' => false,
          'condition' => extension_loaded('pdo_pgsql'),
          'by' => 'All DB-related classes',
          'memo' => 'Required for PostgreSQL database.',
      ),
      // Cache :
      array(
          'name' => 'Memcache extension',
          'mandatory' => false,
          'condition' => extension_loaded('memcache') || extension_loaded('memcached'),
          'by' => '<a href="http://www.yiiframework.com/doc-2.0/yii-caching-memcache.html">MemCache</a>',
          'memo' => extension_loaded('memcached') ? 'To use memcached set <a href="http://www.yiiframework.com/doc-2.0/yii-caching-memcache.html#$useMemcached-detail">MemCache::useMemcached</a> to <code>true</code>.' : ''
      ),
      // CAPTCHA:
      array(
          'name' => 'GD PHP extension with FreeType support',
          'mandatory' => false,
          'condition' => $gdOK,
          'by' => '<a href="http://www.yiiframework.com/doc-2.0/yii-captcha-captcha.html">Captcha</a>',
          'memo' => $gdMemo,
      ),
      array(
          'name' => 'ImageMagick PHP extension with PNG support',
          'mandatory' => false,
          'condition' => $imagickOK,
          'by' => '<a href="http://www.yiiframework.com/doc-2.0/yii-captcha-captcha.html">Captcha</a>',
          'memo' => $imagickMemo,
      ),
      // PHP ini :
      'phpExposePhp' => array(
          'name' => 'Expose PHP',
          'mandatory' => false,
          'condition' => $requirementsChecker->checkPhpIniOff("expose_php"),
          'by' => 'Security reasons',
          'memo' => '"expose_php" should be disabled at php.ini',
      ),
      'phpAllowUrlInclude' => array(
          'name' => 'PHP allow url include',
          'mandatory' => false,
          'condition' => $requirementsChecker->checkPhpIniOff("allow_url_include"),
          'by' => 'Security reasons',
          'memo' => '"allow_url_include" should be disabled at php.ini',
      ),
      'phpSmtp' => array(
          'name' => 'PHP mail SMTP',
          'mandatory' => false,
          'condition' => strlen(ini_get('SMTP')) > 0,
          'by' => 'Email sending',
          'memo' => 'PHP mail SMTP server required',
      ),
  );
  
  // OPcache check
  if (!version_compare(phpversion(), '5.5', '>=')) {
      $requirements[] = array(
          'name' => 'APC extension',
          'mandatory' => false,
          'condition' => extension_loaded('apc'),
          'by' => '<a href="http://www.yiiframework.com/doc-2.0/yii-caching-apccache.html">ApcCache</a>',
      );
  }
  
  $result = $requirementsChecker->checkYii()->check($requirements)->getResult();
  $requirementsChecker->render();
  exit($result['summary']['errors'] === 0 ? 0 : 1);