Discuz! x3.2 添加自定义附件图标方案之一（附件图标问号解决）

方案说明：Discuz!x3.2在使用是，对于未知的文件类型，直接显示问号图标，为了让站长自己的文件类型能显示正确图标，特分享以下教材。
适用版本：Discuz!x2.5-x3.2
解决流程：案例 添加apk显示图标
1.将apk图标 上传到目录：staticimageiletype
保存为apk.png
2.打开文件，路径为：\source\function\function_attachment.php
3.搜索：function attachtype($type, $returnval = 'html') {

  static $attachicons = array(
      1 => 'unknown.gif',
      2 => 'binary.gif',
      3 => 'zip.gif',
      4 => 'rar.gif',
      5 => 'msoffice.gif',
      6 => 'text.gif',
      7 => 'html.gif',
      8 => 'real.gif',
      9 => 'av.gif',
      10 => 'flash.gif',
      11 => 'image.gif',
      12 => 'pdf.gif',
      13 => 'torrent.gif'
    );
改为：function attachtype($type, $returnval = 'html') {

  static $attachicons = array(
      1 => 'unknown.gif',
      2 => 'binary.gif',
      3 => 'zip.gif',
      4 => 'rar.gif',
      5 => 'msoffice.gif',
      6 => 'text.gif',
      7 => 'html.gif',
      8 => 'real.gif',
      9 => 'av.gif',
      10 => 'flash.gif',
      11 => 'image.gif',
      12 => 'pdf.gif',
      13 => 'apk.png',
      14 => 'torrent.gif'
    );
function attachtype($type, $returnval = 'html') {

  static $attachicons = array(
      1 => 'unknown.gif',
      2 => 'binary.gif',
      3 => 'zip.gif',
      4 => 'rar.gif',
      5 => 'msoffice.gif',
      6 => 'text.gif',
      7 => 'html.gif',
      8 => 'real.gif',
      9 => 'av.gif',
      10 => 'flash.gif',
      11 => 'image.gif',
      12 => 'pdf.gif',
      13 => 'apk.png',
      14 => 'torrent.gif'
    );
搜索：if(is_numeric($type)) {
    $typeid = $type;
  } else {
    if(preg_match("/bittorrent|^torrent\t/", $type)) {
      $typeid = 13;
    } elseif(preg_match("/pdf|^pdf\t/", $type)) {
      $typeid = 12;
    } elseif(preg_match("/image|^(jpg|gif|png|bmp)\t/", $type)) {
      $typeid = 11;
    } elseif(preg_match("/flash|^(swf|fla|flv|swi)\t/", $type)) {
      $typeid = 10;
    } elseif(preg_match("/audio|video|^(wav|mid|mp3|m3u|wma|asf|asx|vqf|mpg|mpeg|avi|wmv)\t/", $type)) {
      $typeid = 9;
    } elseif(preg_match("/real|^(ra|rm|rv)\t/", $type)) {
      $typeid = 8;
    } elseif(preg_match("/htm|^(php|js|pl|cgi|asp)\t/", $type)) {
      $typeid = 7;
    } elseif(preg_match("/text|^(txt|rtf|wri|chm)\t/", $type)) {
      $typeid = 6;
    } elseif(preg_match("/word|powerpoint|^(doc|ppt)\t/", $type)) {
      $typeid = 5;
    } elseif(preg_match("/^rar\t/", $type)) {
      $typeid = 4;
    } elseif(preg_match("/compressed|^(zip|arj|arc|cab|lzh|lha|tar|gz)\t/", $type)) {
      $typeid = 3;
    } elseif(preg_match("/octet-stream|^(exe|com|bat|dll)\t/", $type)) {
      $typeid = 2;
    } elseif($type) {
      $typeid = 1;
    } else {
      $typeid = 0;
    }
  }替换为：if(is_numeric($type)) {
    $typeid = $type;
  } else {
    if(preg_match("/bittorrent|^torrent\t/", $type)) {
      $typeid = 14;
    } elseif(preg_match("/apk|^apk\t/", $type)) {
      $typeid = 13;
    } elseif(preg_match("/pdf|^pdf\t/", $type)) {
      $typeid = 12;
    } elseif(preg_match("/image|^(jpg|gif|png|bmp)\t/", $type)) {
      $typeid = 11;
    } elseif(preg_match("/flash|^(swf|fla|flv|swi)\t/", $type)) {
      $typeid = 10;
    } elseif(preg_match("/audio|video|^(wav|mid|mp3|m3u|wma|asf|asx|vqf|mpg|mpeg|avi|wmv)\t/", $type)) {
      $typeid = 9;
    } elseif(preg_match("/real|^(ra|rm|rv)\t/", $type)) {
      $typeid = 8;
    } elseif(preg_match("/htm|^(php|js|pl|cgi|asp)\t/", $type)) {
      $typeid = 7;
    } elseif(preg_match("/text|^(txt|rtf|wri|chm)\t/", $type)) {
      $typeid = 6;
    } elseif(preg_match("/word|powerpoint|^(doc|ppt)\t/", $type)) {
      $typeid = 5;
    } elseif(preg_match("/^rar\t/", $type)) {
      $typeid = 4;
    } elseif(preg_match("/compressed|^(zip|arj|arc|cab|lzh|lha|tar|gz)\t/", $type)) {
      $typeid = 3;
    } elseif(preg_match("/octet-stream|^(exe|com|bat|dll)\t/", $type)) {
      $typeid = 2;
    } elseif($type) {
      $typeid = 1;
    } else {
      $typeid = 0;
    }
  }4.修改完成，覆盖同门文件，登陆后台，更新缓存，上传文件测试哦。