PHP File Upload Classification Example Code

No more chatter, let's get straight to the code. Here is the specific code as follows:

<?php
/**
* File upload class
* @author lijiamin
* @time 2017-02-17
* @email [email protected]
*/
class Upload{
private $allowExt = array('gif','jpg','jpeg','bmp','png','swf');//limit the file upload extensions
private $maxSize = 1;//limit the maximum file upload1M
/**
* get file information
* @param str $flag identifier of the uploaded file
* @return arr array of file upload information
*/
public function getInfo($flag){
return $_FILES[$flag];
}
/**
* get the file suffix
* @param str $filename filename
* @return str file extension
*/
public function getExt($filename){
return pathinfo($filename,PATHINFO_EXTENSION);
}
/**
* check if the uploaded file is valid
* @param str $filename filename
* @return bool whether the file extension is valid
*/
private function checkExt($filename){
$ext = $this->getExt($filename);
return in_array($ext,$this->allowExt
}
/**
* check if the file size exceeds the limit
* @param int size file size
* @return bool whether the file size exceeds the limit
*/
public function checkSize($size){
return $size < $this->maxSize * 1024 * 1024;
}
/**
* random filename
* @param int $len length of random filename
* @return str random string
*/
public function randName($len=6){
return substr(str_shuffle('abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ234565789'),0,$len);
}
/**
* create the path where the file will be uploaded
* @return str file upload path
*/ 
public function createDir(){
//upload file path
$dir = '.'/upload/'.date('Y/m/d',time());
//determine if the folder exists, and create a new one if it does not
if(is_dir($dir) || mkdir($dir,0777,true)){
return $dir;
}
}
/**
* File Upload
* @param str $flag File upload identifier
* @return array Returns the uploaded file name and save path
*/
public function uploadFile($flag){
if($_FILES[$flag]['name'] === '' || $_FILES[$flag]['error'] !== 0){
echo "No file uploaded";
return;
}
$info = $this->getInfo($flag);
if(!$this->checkExt($info['name'])){
echo "Unsupported file type";
return;
}
if(!$this->checkSize($info['size'])){
echo "File size exceeds limit";
return;
}
$filename = $this->randName().'.'.$this->getExt($info['name']);
$dir = $this->createDir();
if(!move_uploaded_file($info['tmp_name'], $dir.'/'.$filename')){
echo "File upload failed";
}
return array('filename'=>$filename,'dir'=>$dir);
}
}
}
?>

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