Restrict upload file type program code

Using JS

Example 1

The code is as follows	Copy Code
<script> function Check () { var filepath=path.value Filepath=filepath.substring (Filepath.lastindexof ('. ') +1,filepath.length) if (filepath!= ' jpg ' && filepath!= ' gif ') Alert ("Upload only pictures in jpg or GIF format") } </script> <input type=file name=path onpropertychange= "check ()" > (only images in JPG or GIF format can be uploaded)

Example 2

The code is as follows	Copy Code
<script> function ck (obj) {if (obj.value.length>0) { var af= "jpg,gif,png,zip,rar,txt,htm"; if (eval ("with" (Obj.value) if (!/) +af.split (","). Join ("|") + "/ig.test (substring) (LastIndexOf ('. ') +1,length))) (1; ")) {alert ("Allowed file types:n" +AF); Obj.createtextrange (). ExecCommand (' delete ')}; }} </script> <form> <input type=file name=path onpropertychange= "ck (this)"/></form>

Example 3

code is as follows

copy code

/*   * Determine the picture type  *  * @param ths  *    type= "file" JavaScript object  * @return t Rue-meets the requirements, false-does not conform to the  */ function Checkimgtype (ths) {  if (Ths.value = "") {   alert ( "Please upload pictures");   return false;  } else {   if (!/. Gif|jpg|jpeg|png| Gif| Jpg| PNG) {    alert (ths.value) $/.test ("Picture type must be one of the. gif,jpeg,jpg,png");     Ths.value = "";    return false;   }  }  return true; }

If we're using the php,asp class, we can't just deal with it like this. Need as follows

The code is as follows	Copy Code
$name =$_files[' file4 ' [' name ']; Get the name of the client machine's original file $type =strstr ($name, "."); Gets the from "." To the last character if ($type!= ". txt") {echo "Sorry, the format of your uploaded file is incorrect!!"; echo "<meta http-equiv=" Refresh content= "3;url=index.php?lmbs= file Upload" > will return to the previous page in 3 seconds ... "; }

The above method to tell the truth can only cheat children, as long as we upload the file suffix name change may be verified through the above

With a little improvement, it's not about the file suffix name.

The code is as follows

Copy Code

$temppath = $upfile [' Tmp_name ']; $fileinfo =pathinfo ($upfile [' name ']); $extension = $upfile [' type ']; Switch ($extension) { Case ' Application/msword ': $extension = ' Doc '; Break Case ' application/vnd.ms-excel ': $extension = ' xls '; Break Case ' application/vnd.openxmlformats-officedocument.wordprocessingml.document ': $extension = ' docx '; Break Case ' Application/vnd.ms-powerpoint ': $extension = ' ppt '; Break Case ' application/pdf ': $extension = ' pdf '; Break Case ' Application/vnd.openxmlformats-officedocument.spreadsheetml.sheet ': $extension = ' xlsx '; Break Default Die (' Only allow uploading doc,docx,xls,pdf,ppt file <a href= ' wend.php ' > re-upload </a> '); }

ID suffix name PHP recognized file type
0 gif image/gif
1 jpg image/jpeg
2 PNG Image/png
3 BMP Image/bmp
4 PSD Application/octet-stream
5 ico Image/x-icon
6 rar Application/octet-stream
7 Zip Application/zip
8 7z Application/octet-stream
9 exe Application/octet-stream
Ten AVI Video/avi
One rmvb APPLICATION/VND.RN-REALMEDIA-VBR
3GP Application/octet-stream
Application/octet-stream flv
MP3 Audio/mpeg
WAV Audio/wav
KRC Application/octet-stream
LRC Application/octet-stream
TXT Text/plain
Doc Application/msword
XLS application/vnd.ms-excel
PPT Application/vnd.ms-powerpoint
PDF Application/pdf
Application/octet-stream CHM
Application/msaccess mdb
SQL Application/octet-stream
Num Con application/octet-stream
Log Text/plain
DAT Application/octet-stream
Application/octet-stream INI
PHP Application/octet-stream
to HTML text/html
text/html htm
TTF Application/octet-stream
fon application/octet-stream
JS Application/x-javascript
XML Text/xml
Notoginseng DLL Application/octet-stream
Application/octet-stream DLL