PHP implementation File Upload

This is the PHP implementation of File upload example

PHPDefine("Max_file_size", 102400);//definition file max_file_size$upfile=$_files["Upfile"];//gets the value in the array$name=$upfile["Name"];//file name$type=$upfile["type"];//File Type$size=$upfile["Size"];//File Size$tmp _name=$upfile["Tmp_name"];//Temporary file pathif(isset($_post["Sub"])){if(Is_uploaded_file($tmp _name)){//determine if the upload file existsSwitch($type){//Switch Judgment Type Case"Image/png":$oktype=true; Break; Case"Image/jpeg":$oktype=true; Break; Case"Image/gif":$oktype=true; Break; Case"Image/jpg":$oktype=true; Break; Case"Image/bmp":$oktype=true; Break;default:$oktype=true;}if($oktype){//if it returns True$error=$upfile["Error"];//the value returned by the system after uploading/** * 0. Upload success * 1. exceeds file size, php.ini specified value * 2. File size exceeded, Max_file_size * 3. File partial upload * 4. File upload failed * 5. uploaded file size is 0*/ if($error==0&&$size<=max_file_size) {//file size less than max_file_sizeEcho"<br> Upload Success!<br>";//foreach ($upload as $name = + $value) {//echo $name. " = ". $value;//}Echo"File name:".$name." <br> ";//Output File nameEcho"File Size:".$size." <br> ";//Output File SizeEcho"File type:".$type." <br> ";//output File TypeEcho"File Temp file path:".$tmp _name." <br> ";//Output File Temp path$upload= "upload/";//file directoryif(!file_exists($upload)){//determine if the file directory existsmkdir($upload);//does not exist, the file directory is createdchmod($upload, "700");//read/write browse}$iconv=Iconv("Utf-8", "gb2312",$name);//Convert encoding Format$destination=$upload.$iconv;//PathMove_uploaded_file($tmp _name,$destination);//If the upload succeeds, move the file to the created directoryEcho"Picture Preview:<br>";Echo"$destination' ></img> ';//Previewing files}Else if($error==1) {//Type of errorEcho"Over file size, modified under PHP.ini file"; }Else if($error==2){Echo"More than the file size, set value of the max_file_size option";}Else if($error==3){Echo"File only partially uploaded";}Else if($error==4){Echo"File not uploaded";}Else if($error==5){Echo"The uploaded file size is zero";}Else{Echo"Please upload files in JPEG,GIF,PNH format";} }                                    }}?>

PHP implementation File Upload