PHP Partial---Single-File Upload package class

<?PHP$fileinfo=$_files["MyFile"];functionUploadFile ($fileinfo,$allowext=Array(' jpeg ', ' jpg ', ' PND ', ' gif ', ' wbmp '),$flag=true,$maxsize=2097152){//Judging error Messagesif($fileinfo[' Error ']>0){    Switch($fileinfo[' Error '])        {             Case1:$mes= "The upload file exceeds the value of the upload_max_filesize option in the PHP configuration file";  Break;  Case2:$mes= "exceeds the limit size of form max_file_size";  Break;  Case3:$mes= "File part is uploaded";  Break;  Case4:$mes= "No Upload file selected";  Break;  Case6:$mes= "No temp directory Found";  Break;  Case7: Case8:$mes= "System Error";  Break; }        Exit($mes); }//determine if the upload file type is in the specified type    $allowext=Array(' jpeg ', ' jpg ', ' PND ', ' gif ', ' wbmp ');//define the allowed upload file types    $ext=Strtolower(End(Explode(‘,‘,$fileinfo[' name ']));//intercept upload file extension    if(!In_array($ext,$allowext))//determine if the extension of the uploaded file is in a defined type    {         Exit(' Illegal file type '); }//determine the upload file size    $maxsize= 2097152;//write the maximum number of bytes, you count    if($fileinfo[' Size ']>$maxsize)    {        Exit(' Upload file too large '); }        //determine if the file was uploaded via HTTP post    if(!Is_uploaded_file($fileinfo[' Tmp_name ']))    {        Exit(' File not uploaded by HTTP post ')); }        //detects if a real picture type is true, but not what is considered a change    $flag=true; if($flag)    {        if(!getimagesize($fileinfo[' Tmp_name ']))        {            Echo"Not a real picture type"; }        }        //determine if the folders stored on the server are not$path= ' uploads ';//file name stored on the server    if(!file_exists($path))    {        mkdir($path, 0777,true);//Create a directory if it does not exist        chmod($path, 0777);//Add a permission                }$uniname=MD5(uniqid(Microtime(true),true)).‘.‘.$ext;//by MD5 Encryption and other measures to name the filename, resulting in a unique file name        $destination=$path.‘ /‘.$uniname; if(!Move_uploaded_file($fileinfo[' Tmp_name '],$destination))//Uploading Files    {        Echo"File upload Failed"; }        return Array(        ' NewName ' =$destination, ' size ' =$fileinfo[' Size '], ' type ' = =$fileinfo[' Type ']            ); }

PHP Partial---Single-File Upload package class