Simple repository of common file mime types

MIME.php

<?php
/**
 * Simple repository of common file mime types
 */
class MIME {
  
  private static $types = array(
    'ai' => 'application/postscript',
    'aif' => 'audio/x-aiff',
    'aiff' => 'audio/x-aiff',
    'asf' => 'video/x-ms-asf',
    'asx' => 'video/x-ms-asx',
    'avi' => 'video/avi',
    'bin' => 'application/octet-stream',
    'bmp' => 'image/bmp',
    'bz' => 'application/x-bzip',
    'bz2' => 'application/x-bzip2',
    'crt' => 'application/x-x509-ca-cert',
    'css' => 'text/css',
    'csv' => 'text/plain',
    'doc' => 'application/msword',
    // 'docx' => 'application/msword',
    'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
    'dot' => 'application/msword',
    'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
    'dxf' => 'application/dxf',
    'eps' => 'application/postscript',
    'gif' => 'image/gif',
    'gz' => 'application/x-gzip',
    'gzip' => 'application/x-gzip',
    'htm' => 'text/html',
    'html' => 'text/html',
    'ico' => 'image/x-icon',
    'jpg' => 'image/jpeg',
    'jpe' => 'image/jpeg',
    'jpeg' => 'image/jpeg',
    'js' => 'text/javascript',
    'm4a' => 'audio/mp4',
    'mov' => 'video/quicktime',
    'mp3' => 'audio/mpeg',
    'mp4' => 'video/mp4',
    'mpeg' => 'video/mpeg',
    'mpg' => 'video/mpeg',
    // 'msg' => 'application/vnd.ms-outlook',
    'msg' => 'application/CDFV2-corrupt',
    'pdf' => 'application/pdf',
    'php' => 'text/plain',
    'phps' => 'text/plain',
    'png' => 'image/png',
    'pot' => 'application/vnd.ms-powerpoint',
    'ppa' => 'application/vnd.ms-powerpoint',
    'pps' => 'application/vnd.ms-powerpoint',
    'ppt' => 'application/vnd.ms-powerpoint',
    'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
    'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
    'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
    'ps' => 'application/postscript',
    'qt' => 'video/quicktime',
    'ra' => 'audio/x-pn-realaudio',
    'ram' => 'audio/x-pn-realaudio',
    'rtf' => 'application/rtf',
    'shtml' => 'text/html',
    'sit' => 'application/x-stuffit',
    'swf' => 'application/x-shockwave-flash',
    'sql' => 'text/plain',
    'tar' => 'application/x-tar',
    'tgz' => 'application/x-compressed',
    'tif' => 'image/tiff',
    'tiff' => 'image/tiff',
    'txt' => 'text/plain',
    'wav' => 'audio/wav',
    'wma' => 'audio/x-ms-wma',
    'wmf' => 'windows/metafile',
    'wmv' => 'video/x-ms-wmv',
    'xls' => 'application/vnd.ms-excel',
    'xlsx' => 'application/vnd.ms-excel',
    'xlt' => 'application/vnd.ms-excel',
    'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
    'z' => 'application/x-compressed',
    'zip' => 'application/zip'
  );

  private static $groups = array(
    'Dokument' => array('doc','docx','dot','dotx','rtf','txt'),
    'PowerPoint' => array('ppa','pot','pps','ppt','pptx','potx','ppsx'),
    'Email' => array('msg'),
    'Tabelle' => array('csv','xla','xls','xlsx','xlt','xltx'),
    'Bild' => array('ai','bmp','dxf','eps','gif','ico','jpg','jpe','jpeg','png','ps','swf','tif','tiff','wmf'),
    'Archiv' => array('bin','bz','bz2','gz','sit','tar','tgz','z','zip'),
    'Video' => array('asf','asx','avi','mov','mpg','mpeg','mp4','qt','ra','ram','swf','wmv'),
    'Audio' => array('mp3','m4a','ra','ram','wav','wma'),
    'Code' => array('css','js','htm','html','php','phps','shtml','sql'),
    'PDF' => array('pdf'),
  );


  /**
   * Return group from suffix or type
   */
  public function group($suffix) {

    if(strpos($suffix, '/')) $suffix = self::suffix($suffix)[0];

    foreach (self::$groups as $group => $suffixes) {
      if (in_array(strtolower($suffix), $suffixes)) 
        return $group;
    }

    return false;
  }


  /**
   * Return array of mime types
   */
  public function types($group_type = false) {
    if (!$group_type) {
      return self::$types;
    } else {
      if (array_key_exists($group_type, self::$groups)) {
        foreach(self::$types as $key => $mt) {
          if(in_array($key, self::$groups[$group_type])) {
            $types[$key] = $mt;
          }
        }
        return $types;
      } else {
        return false;
      }
    }
  }

  /**
   * Return type from suffix
   */
  public function type($suffix) {
    if (array_key_exists($suffix, self::$types)) {
      return self::$types[$suffix];
    } else {
      return false;
    }
  }
   
  /**
   * Return array of suffixes from group
   */
  public function suffixes($group_type) {
    if (array_key_exists($group_type, self::$groups)) {
      return self::$groups[$group_type];
    } else {
      return false;
    }
  }

  /**
   * Return array of suffixes from type
   */
  public function suffix($type) {
    if (in_array($type, self::$types)) {
      return array_keys(self::$types, $type);
    } else {
      return false;
    }
  }
}