An error occurred while uploading the upload. php file after enabling image upload in the editor ckeditor.

Ask the Editor ckeditor to enable the upload of the upload. php file. After I use the ckeditor to enable the image upload mode, the php source code for image uploading is as follows, but the following error is always prompted during the upload:
Please indicate the cause of the error:




The source code is as follows:
/*
CKEditor_upload.php
Monkee

*/
$ Config = array ();
$ Config ['type'] = array ("flash", "img"); // upload the allowed type value
$ Config ['IMG '] = array ("jpg", "bmp", "gif"); // img allows suffixes
$ Config ['Flash'] = array ("flv", "swf"); // flash allows suffixes
$ Config ['flash _ size'] = 200; // The maximum size of the uploaded flash is KB.
$ Config ['IMG _ size'] = 500; // The maximum size of uploaded img is KB.
$ Config ['message'] = "uploaded successfully"; // The message displayed after the upload is successful. if it is null, the message is not displayed.
$ Config ['name'] = mktime (); // the uploaded file naming rules are named in unix timestamps.
$ Config ['flash _ dir'] = "upload/flash"; // use the absolute address to upload the flash file to facilitate upload. "/" is not added after the php file is placed in any location on the site "/"
$ Config ['IMG _ dir'] = "upload/img"; // The absolute address is used to upload the imgfile. the absolute address is used to facilitate upload. "/" is not added after the php file is placed in any location on the site "/"
$ Config ['site _ url'] = ""; // The website address. this parameter is related to the image upload address. "/" is left blank.
// File Upload
Uploadfile ();
Function uploadfile ()
{
Global $ config;
// Determine whether the call is illegal
If (empty ($ _ GET ['ckeditorfuncnum'])
Mkhtml (1, "", "incorrect function call request ");
$ Fn = $ _ GET ['ckeditorfuncnum'];
If (! In_array ($ _ GET ['type'], $ config ['type'])
Mkhtml (1, "", "incorrect file call request ");
$ Type = $ _ GET ['type'];
If (is_uploaded_file ($ _ FILES ['upload'] ['tmp _ name'])
{
// Determine whether a file is allowed to be uploaded
$ Filearr = pathinfo ($ _ FILES ['upload'] ['name']);
$ Filetype = $ filearr ["extension"];
If (! In_array ($ filetype, $ config [$ type])
Mkhtml ($ fn, "", "incorrect file type! ");
// Determine whether the file size meets the requirements
If ($ _ FILES ['upload'] ['size']> $ config [$ type. "_ size"] * 1024)
Mkhtml ($ fn, "", "the uploaded file cannot exceed". $ config [$ type. "_ size"]. "KB! ");
// $ Filearr = explode (".", $ _ FILES ['upload'] ['name']);
// $ Filetype = $ filearr [count ($ filearr)-1];
$ File_abso = $ config [$ type. "_ dir"]. "/". $ config ['name']. ".". $ filetype;
$ File_host = $ _ SERVER ['document _ root']. $ file_abso;
If (move_uploaded_file ($ _ FILES ['upload'] ['tmp _ name'], $ file_host ))
{
Mkhtml ($ fn, $ config ['site _ url']. $ file_abso, $ config ['message']);
}
Else
{
Mkhtml ($ fn, "", "file Upload failed. Please check the upload directory settings and directory read/write permissions ");
}
}
}
// Output js call
Function mkhtml ($ fn, $ fileurl, $ message)
{
$ Str ='