PHP文件上传类

class Upload{

	//错误信息
	private $errorNo;
	private $errorMsg;
	//文件类型
	private $ext;
	//允许的文件类型
	private $allowExt;
	//文件的大小
	private $size;
	//允许的文件大小
	private $allowSize;
	//存放图片的主文件名称
	private $dir;
	//子文件夹名称
	private $dirSec;
	//临时文件名
	private $tmpName;
	//分隔符
	const DS = DIRECTORY_SEPARATOR;

	public function __construct($file,$dir='upload',$allowExt=['jpg','jpeg','gif','png'],$allowSize = 2097152){
		$this->errorNo = $file['error'];
		$this->ext = $file['name'];
		$this->size = $file['size'];
		$this->tmpName=$file['tmp_name'];
		$this->dir = $dir;
		$this->allowExt=$allowExt;
		$this->allowSize=$allowSize;
	}

	public function UpLoad(){
		if(!$this->checkFile()){
			return $this->errorMsg;
		}
		
		if(!$this->createDir()){
			return $this->errorMsg;
		};
		echo $this->moveFile();
	}

	private function checkFile(){
		if(!$this->checkError()){
			$this->errorMsg='文件错误，无法上传!';
			return false;
		}
		if(!$this->checkExt()){
			$this->errorMsg='不是图片，无法上传!';
			return false;
		}
		if(!$this->checkSize()){
			$this->errorMsg='文件超过指定大小，无法上传';
			return false;
		}

		return true;
	}

	//检查文件错误
	private function checkError(){
		if($this->errorNo!=0){
			return false;
		}
		return true;
	}

	//检查文件类型
	private function checkExt(){
		if(!in_array(pathinfo($this->ext)['extension'],$this->allowExt)){
			return false;
		}
		return true;
	}

	//检查文件大小
	private function checkSize(){
		if($this->size > $this->allowSize){
			return false;
		}
		return true;
	}

	//创建文件夹
	private function createDir(){
		$this->dirSec = $this->dir.self::DS.date('Y-m-d');
		if(!file_exists($this->dir)){
			if(!(mkdir($this->dir) && mkdir($this->dirSec))){
				$this->errorMsg='主目录创建失败';
				return false;
			}
		}elseif(!file_exists($this->dirSec)){
			if(!mkdir($this->dirSec)){
				$this->errorMsg='子目录创建失败';
				return false;
			}
		}
		return true;
	}

	//移动文件
	private function moveFile(){
		$imgName = date('YmdHis').'_'.mt_rand(10000,99999);
		move_uploaded_file($this->tmpName,$this->dirSec.self::DS.$imgName.'.'.pathinfo($this->ext)['extension']);
		return $this->dirSec.self::DS.$imgName.'.'.pathinfo($this->ext)['extension'];
	}
}

自己写了一个，拿去直接用 $file = $_FILES['img'];

//new Upload(获取的文件信息,上传的文件夹，允许的文件类型，允许的文件大小); $upload = new Upload($file,'upload',['gif','png','jpg','jpeg'],444444444); $upload->UpLoad();