PHP Unicode::encodingFromBOM方法代码示例

 /**
  * {@inheritdoc}
  */
 public function optimize(array $js_asset)
 {
     if ($js_asset['type'] !== 'file') {
         throw new \Exception('Only file JavaScript assets can be optimized.');
     }
     if ($js_asset['type'] === 'file' && !$js_asset['preprocess']) {
         throw new \Exception('Only file JavaScript assets with preprocessing enabled can be optimized.');
     }
     // If a BOM is found, convert the file to UTF-8, then use substr() to
     // remove the BOM from the result.
     $data = file_get_contents($js_asset['data']);
     if ($encoding = Unicode::encodingFromBOM($data)) {
         $data = Unicode::substr(Unicode::convertToUtf8($data, $encoding), 1);
     } elseif (isset($js_asset['attributes']['charset'])) {
         $data = Unicode::convertToUtf8($data, $js_asset['attributes']['charset']);
     }
     // No-op optimizer: no optimizations are applied to JavaScript assets.
     return $data;
 }

 /**
  * Loads the stylesheet and resolves all @import commands.
  *
  * Loads a stylesheet and replaces @import commands with the contents of the
  * imported file. Use this instead of file_get_contents when processing
  * stylesheets.
  *
  * The returned contents are compressed removing white space and comments only
  * when CSS aggregation is enabled. This optimization will not apply for
  * color.module enabled themes with CSS aggregation turned off.
  *
  * Note: the only reason this method is public is so color.module can call it;
  * it is not on the AssetOptimizerInterface, so future refactorings can make
  * it protected.
  *
  * @param $file
  *   Name of the stylesheet to be processed.
  * @param $optimize
  *   Defines if CSS contents should be compressed or not.
  * @param $reset_basepath
  *   Used internally to facilitate recursive resolution of @import commands.
  *
  * @return
  *   Contents of the stylesheet, including any resolved @import commands.
  */
 public function loadFile($file, $optimize = NULL, $reset_basepath = TRUE)
 {
     // These statics are not cache variables, so we don't use drupal_static().
     static $_optimize, $basepath;
     if ($reset_basepath) {
         $basepath = '';
     }
     // Store the value of $optimize for preg_replace_callback with nested
     // @import loops.
     if (isset($optimize)) {
         $_optimize = $optimize;
     }
     // Stylesheets are relative one to each other. Start by adding a base path
     // prefix provided by the parent stylesheet (if necessary).
     if ($basepath && !file_uri_scheme($file)) {
         $file = $basepath . '/' . $file;
     }
     // Store the parent base path to restore it later.
     $parent_base_path = $basepath;
     // Set the current base path to process possible child imports.
     $basepath = dirname($file);
     // Load the CSS stylesheet. We suppress errors because themes may specify
     // stylesheets in their .info.yml file that don't exist in the theme's path,
     // but are merely there to disable certain module CSS files.
     $content = '';
     if ($contents = @file_get_contents($file)) {
         // If a BOM is found, convert the file to UTF-8, then use substr() to
         // remove the BOM from the result.
         if ($encoding = Unicode::encodingFromBOM($contents)) {
             $contents = Unicode::substr(Unicode::convertToUtf8($contents, $encoding), 1);
         } elseif (preg_match('/^@charset "([^"]+)";/', $contents, $matches)) {
             if ($matches[1] !== 'utf-8' && $matches[1] !== 'UTF-8') {
                 $contents = substr($contents, strlen($matches[0]));
                 $contents = Unicode::convertToUtf8($contents, $matches[1]);
             }
         }
         // Return the processed stylesheet.
         $content = $this->processCss($contents, $_optimize);
     }
     // Restore the parent base path as the file and its children are processed.
     $basepath = $parent_base_path;
     return $content;
 }