本文实例讲述了php上传图片类及用法。分享给大家供大家参考，具体如下：
1.类文件名为：upclass.php
<?phpclass upclass{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="./userimg/"; //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]*$this->previewsize; } echo("<img src=/"{$this->ph_name}/" width=/"{$this->imgsize['0']}/" height=/"{$this->imgsize['1']}/">"); } } //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(); $this->showphoto(); }}?> 2.html页面：
<form action="upphoto.php" method="post" enctype="multipart/form-data">图片来源：<input type="file" name="photo" id="photo"><input type="submit" name="submit" value="上传"></form>
3.调用类的文件名为：upphoto.php
<?phpheader("Content-Type:text/html; charset=utf-8"); //类的实例化：include("upclass.php");//类的文件名是upoop.php$up=new upclass();$submit=$_POST['submit'];if($submit=="上传"){$up->get_ph_tmpname($_FILES['photo']['tmp_name']);$up->get_ph_type($_FILES['photo']['type']);$up->get_ph_size($_FILES['photo']['size']);$up->get_ph_name($_FILES['photo']['name']);$up->save();}?><?php$images=$up->get_ph_name($_FILES['photo']['name']); echo "<img src='$images' />";?> 
