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
<?php
class 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
<?php
header("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' />";
?>
希望本文所述对大家PHP程序设计有所帮助。