图片上传类

<?php
class upphoto{
	public $previewsize=0.125  ;   //预览图片比例
	public $preview=0;   //是否生成预览，是为1，否为0
    public $datetime;   //随机数
    public $ph_name;   //上传图片文件名
    public $ph_tmp_name;    //图片临时文件名
    public $ph_path="./upload/";    //上传文件存放路径
	public $ph_type;   //图片类型
    public $ph_size;   //图片大小
    public $imgsize;   //上传图片尺寸，用于判断显示比例
    public $al_ph_type=array('image/jpg','image/jpeg','image/png','image/pjpeg','image/gif','image/bmp','image/x-png');    //允许上传图片类型
    public $al_ph_size=1000000;   //允许上传文件大小

	function __construct(){
		$this->set_datatime();
	}
	function set_datatime(){
		$this->datetime=date("YmdHis");
	}
	
	//获取文件类型
	function get_ph_type($phtype){
		$this->ph_type=$phtype;
	}
	//获取文件大小
	function get_ph_size($phsize){
		$this->ph_size=$phsize."<br>";
	}
	//获取上传临时文件名
	function get_ph_tmpname($tmp_name){
		$this->ph_tmp_name=$tmp_name;
		$this->imgsize=getimagesize($tmp_name);
	}
	//获取原文件名
	function get_ph_name($phname){
		$this->ph_name=$this->ph_path.$this->datetime.strrchr($phname,"."); //strrchr获取文件的点最后一次出现的位置
	 //$this->ph_name=$this->datetime.strrchr($phname,"."); //strrchr获取文件的点最后一次出现的位置
		return $this->ph_name;
	}
	//判断上传文件存放目录
	function check_path(){
		if(!file_exists($this->ph_path)){
			mkdir($this->ph_path);
		}
	}
  //判断上传文件是否超过允许大小
    function check_size(){
		if($this->ph_size>$this->al_ph_size){
			$this->showerror("上传图片超过2000KB");
		}
    }
  //判断文件类型
    function check_type(){
		if(!in_array($this->ph_type,$this->al_ph_type)){
			$this->showerror("上传图片类型错误");
	    }
    }
   //上传图片
	function up_photo(){
		if(!move_uploaded_file($this->ph_tmp_name,$this->ph_name)){
			$this->showerror("上传文件出错");
	    }
    }
  //图片预览
	function showphoto(){
		if($this->preview==1){
			if($this->imgsize[0]>2000){
				$this->imgsize[0]=$this->imgsize[0]*$this->previewsize;
				$this->imgsize[1]=$this->imgsize[1]*$this->previewsize;
			}
			$html="<img src=\"{$this->ph_name}\" width=\"{$this->imgsize['0']}\" height=\"{$this->imgsize['1']}\">";
			return $html;
		}
    }
  //错误提示
	function showerror($errorstr){
		echo "<script language=javascript>alert('$errorstr');location='javascript:history.go(-1);';</script>";
		exit();
	}
	
	function save(){
		$this->check_path();
		$this->check_size();
		$this->check_type();
		$this->up_photo();
		$html_img = $this->showphoto();
		return $html_img;
	}
}
?>