Upload a file to determine whether the file name is repeated

Determine whether a file name is repeated during File upload. how can I determine whether a file name is repeated during File upload? I know $ _ FILES [& quot; form name & quot;] $ _ FILES [& quot; form name & quot;] [& quot; name & quot;] how does one obtain the image name in the upload path document? & Lt; upload a file to determine whether the file name is repeated. please advise
How can I identify duplicate file names during File upload?
Upload file I know
$ _ FILES ["form name"]
$ _ FILES ["form name"] ["name"] name
How do I obtain the image name in the upload path document?


Class UpFile {
Private $ name; // name
Private $ type; // type
Private $ size; // size
Private $ tempDirectory; // temporary path of the server
Private $ directory; // The actual path of the directory (temporarily move the actual path)
Private $ allowType; // allowed file types
Private $ error;

Function _ construct ($ FILE ){
$ This-> name = $ FILE ["name"];
$ This-> type = $ FILE ["type"];
$ This-> size = $ FILE ["size"];
$ This-> tempDirectory = $ FILE ["tmp_name"];
$ This-> directory = "../image/". $ this-> name;

$ This-> allowType = array (
'Image/jpg ',
'Image/png ',
'Image/GIF ',
'Image/pjpeg'
);
$ This-> error = $ FILE ["error"];
}
Function isUpFile () {// indicates whether a file exists. 1 or 0 1 indicates that a file exists.
Return is_uploaded_file ($ this-> tempDirectory );
}
Function moveFile () {// File Movement
Move_uploaded_file ($ this-> tempDirectory, $ this-> directory );
}
Function iftype () {// check the file type unlink (path); // delete the file
If (in_array ($ this-> type, $ this-> allowType )){
Return true;
} Else {
Return false;
}
}
Function ifName (){
// Determine whether the uploaded file name is the same as the uploaded file name
}
}
?>


Include ("UpFile. php ");
$ Upfile = new UpFile ($ _ FILES ["upfile"]);

?>




------ Solution --------------------
$ File = $ _ FILES ["form name"] ["name"];
If (file_exists ($ file ))
Echo 'exist ';
Else
Move_uploaded_file ()........
------ Solution --------------------
If (file_exists ($ this-> tempDirectory) echo 'file already exists ';
------ Solution --------------------
Follow the rules to create an absolute path, and then you can know whether the file in the path exists...
However, this method is not safe. we recommend that you use a random file name.
------ Solution --------------------
Discussion
$ File = $ _ FILES ["form name"] ["name"];
If (file_exists ($ file ))
Echo 'exist ';
Else
Move_uploaded_file ()........