A very useful file upload class in PHP_PHP tutorial

class FileUpload{

private $filepath; //Set the path to upload files
private $allowtype=array('jpg','jpeg','gif','bmp'); //Default file type
private $maxsize=2000000; //Default file size
private $israndname=true; //Whether to use a random file name
private $originName; //Source file name
private $tmpFileName; //Temporary file name
private $fileType; //File type
private $fileSize; //The size of the file
private $newFileName; //The name of the new file
private $errorNum; //Error number
private $errorMess=""; //Used to prompt error reports
//Function used for file initialization
function __construct($options=array()){
foreach($options as $key=>$val){
$key=strtolower($key);//Set attribute names to lowercase
//get_class_vars(get_class($this))
//Get all attributes of the current class
If(!in_array($key,get_class_vars(get_class($this)))){
Continue;
}
else
{
$this->setOption($key,$val);
}
}
}

//Define different error levels
private function getError(){
$str="Error uploading file {$this->originName}:";

return $str."
";
}

//Function to assign values ​​to member attributes
private function setOption($key,$val){
$this->$key=$val;
}
// Used to check the path of uploaded files
private function checkFilePath(){
//If the file path is empty
if(empty($this->filepath)){
$this->setOption('errorNum',-5);
Return false;
}
//Determine whether the path exists and is writable
If(!file_exists($this->filepath)||!is_writable($this->filepath)){
//@ is the error suppressor @ is to ignore the error prompt and make it error
//Error messages will not be displayed in the program
If(!@mkdir($this->filepath,0755)){
$this->setOption('errorNum',-4);
Return false;
}
}
Return true;
}

//Function to check file size
private function checkFileSize(){
if($this->fileSize>$this->maxsize){
$this->setOption("errorNum",-2);
Return false;
}
else
{
Return true;
}

}

//Check the type of uploaded file
private function checkFileType(){
If(in_array(strtolower($this->fileType),$this->allowtype))
{
Return true;
}
else
{
$this->setOption("errorNum",-1);
Return false;
}
}
//Upload a file
function uploadFile($fileField){
$return=true;
$name=$_FILES[$fileField]["name"]; //Name submitted by post
$tmp_name=$_FILES[$fileField]["tmp_name"]; //Temporary file name when uploading
$size=$_FILES[$fileField]["size"];
$error=$_FILES[$fileField]["error"];
If($this->setFiles($name,$tmp_name,$size,$error)){
If($this->checkFileSize() && $this->checkFileType()){
$this->setNewFileName();
If($this->copyFile())
{
       $return=true;
}
      else
{
       $return=false;
}
}
else
{
$return=false;
}
}
else
{
$return=false;
}
//Check the file path for errors
if(!$this->checkFilePath()){
$this->errorMess=$this->getError();
Return false;
}

if(!$return)
{
$this->errorMess=$this->getError();
}
Return $return;
}
//Set content related to $_FILES
private function setFiles($name="",$tmp_name="",$size=0,$error=0){
$this->setOption("errorNum",$error);
if($this->errorNum){
Return false;
}
$arrstr=explode(".",$name);
$this->setOption("fileType",strtolower($arrstr[count($arrstr)-1]));
$this->setOption("originName",$name);
$this->setOption("tmpFileName",$tmp_name);
$this->setOption("fileSize",$size);
Return true;
}

//Used to get the name of the uploaded file
function getNewFileName(){
Return $this->newFileName.'Upload successful! ';
}

//Function to display error message when uploading file fails
function getErrorMsg(){
Return $this->errorMess;
}
private function proRandName(){
$filename=date("YmdHis").rand(100,999);
Return $filename.".".$this->fileType;
}

//Set the uploaded file name
private function setNewFileName(){
if($this->israndname){
$this->setOption('newFileName',$this->proRandName());
}
else
{
$this->setOption('newFileName',$this->originName);
}
}

//Copy file
private function copyFile(){
if(!$this->errorNum){
$filepath=rtrim($this->filepath,'/')."/";
$filepath.=$this->newFileName;
//Copy the file to the specified path
If(@move_uploaded_file($this->tmpFileName,$filepath)){
Return true;
}
else
{
$this->setOption('errorNum',-3);
Return false;
}
}
}


}

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