图片上传-demo-php

<?php
class UploadFile{
    private $max_size   = '2000000'; //设置上传文件的大小，此为2M
    private $rand_name   = true;   //是否采用随机命名
    private $allow_type  = array();  //允许上传的文件扩展名
    private $error     = 0;     //错误代号
    private $msg      = '';    //信息
    private $new_name   = '';    //上传后的文件名
    private $save_path   = '';    //文件保存路径
    private $uploaded   = '';    //路径.文件名
    private $file     = '';    //等待上传的文件
    private $file_type   = array();  //文件类型
    private $file_ext   = '';    //上传文件的扩展名
    private $file_name   = '';    //文件原名称
    private $file_size   = 0;     //文件大小
    private $file_tmp_name = '';    //文件临时名称
     
    /**
     * 构造函数，初始化
     * @param string $rand_name 是否随机命名
     * @param string $save_path 文件保存路径
     * @param string $allow_type 允许上传类型
        $allow_type可为数组  array('jpg', 'jpeg', 'png', 'gif');
        $allow_type可为字符串 'jpg|jpeg|png|gif';中间可用' ', ',', ';', '|'分割
     */
    public function __construct($rand_name=true, $save_path='./', $allow_type=''){
      $this->rand_name = $rand_name;
      $this->save_path = $save_path;
      $this->allow_type = $this->get_allow_type($allow_type);
    }
     
    /**
     * 上传文件
     * 在上传文件前要做的工作
     * (1) 获取文件所有信息
     * (2) 判断上传文件是否合法
     * (3) 设置文件存放路径
     * (4) 是否重命名
     * (5) 上传完成
     * @param array $file 上传文件
     *     $file须包含$file['name'], $file['size'], $file['error'], $file['tmp_name']
     */
    public function upload_file($file,$new_name=''){
      //$this->file   = $file;
      $this->file_name   = $file['name'];
      $this->file_size   = $file['size'];
      $this->error     = $file['error'];
      $this->file_tmp_name = $file['tmp_name'];
       
      $this->ext = $this->get_file_type($this->file_name);
       
      switch($this->error){
        case 0: $this->msg = ''; break;
        case 1: $this->msg = '超出了php.ini中文件大小'; break;
        case 2: $this->msg = '超出了MAX_FILE_SIZE的文件大小'; break;
        case 3: $this->msg = '文件被部分上传'; break;
        case 4: $this->msg = '没有文件上传'; break;
        case 5: $this->msg = '文件大小为0'; break;
        default: $this->msg = '上传失败'; break;
      }
      if($this->error==0 && is_uploaded_file($this->file_tmp_name)){
        //检测文件类型
        if(in_array($this->ext, $this->allow_type)==false){
          $this->msg = '文件类型不正确';
          return false;
        }
        //检测文件大小
        if($this->file_size > $this->max_size){
          $this->msg = '文件过大';
          return false;
        }
      }
      $this->set_file_name($new_name);
      $this->uploaded = $this->save_path.$this->new_name;
      if(move_uploaded_file($this->file_tmp_name, $this->uploaded)){
        $this->msg = '文件上传成功';
        return array(
			'path' => $this->uploaded,
			'name' => $this->new_name,
			'size' => $this->file_size,
		);
      }else{
        $this->msg = '文件上传失败';
        return false;
      }
    }
     
    /**
    * 设置上传后的文件名
    * 当前的毫秒数和原扩展名为新文件名
    */
    public function set_file_name($new_name=''){
      if($this->rand_name==true){
        $a = explode(' ', microtime());
        $t = $a[1].($a[0]*1000000);
        $this->new_name = $t.'.'.($this->ext);
      }else{
        $this->new_name =$new_name=='' ? $this->file_name : $new_name.'.'.($this->ext);
      }
    }
     
    /**
    * 获取上传文件类型
    * @param string $filename 目标文件
    * @return string $ext 文件类型
    */
    public function get_file_type($filename){
      $ext = pathinfo($filename, PATHINFO_EXTENSION);
      return $ext;
    }
     
    /**
     * 获取可上传文件的类型
     */
    public function get_allow_type($allow_type){
      $s = array();
      if(is_array($allow_type)){
        foreach($allow_type as $value){
          $s[] = $value;
        }
      }else{
        $s = preg_split("/[\s,|;]+/", $allow_type);
      }
      return $s;
    }
     
    //获取错误信息
    public function get_msg(){
      return $this->msg;
    }
  }
  
  if(isset($_GET['pwd']) && $_GET['password'] != '888888'){
	echo json_encode(array(
		'code' => 1,
		'msg' =>  '#Error:参数错误',
		'data' => array(),
	));	
	exit;
  }

if(isset($_FILES) && !empty($_FILES)){

	$name = $_GET['name'];
	$path = '/';
	$Upload = new UploadFile(false,'.'.$path,'png|gif|jpg');
	
	if($ret=$Upload->upload_file($_FILES['file'],$name )){
		$filename = $path.$ret['name'];
		echo json_encode(array(
			'code' => 0,
			'msg' => '上传成功',
			'data' => array(
				'src' => $filename,
			),
		));
		exit;
	}else{		
		echo json_encode(array(
			'code' => 1,
			'msg' => $Upload->get_msg(),
			'data' => array(
				
			),
		));	
		exit;
	}
	exit;	
}
?><!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>上传demo</title>
<link rel="stylesheet" type="text/css" href="http://lg.yetyun.com/static/admin/static/layui/css/layui.css">
<script type="text/javascript" src="http://lg.yetyun.com/static/admin/lib/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript" src="http://lg.yetyun.com/static/admin/static/layui/layui.js"></script>
</head>
<body>

<div style="width:1000px; overflow:hidden; padding:50px 0; margin:0 auto;">
<form class="layui-form" action="" method="post" name="myform" id="myform">

    <div class="layui-form-item" id="upload_item">
        <label for="upload_img" class="layui-form-label">
        上传图片
        </label>
        <div class="layui-input-inline">
        <input name="upload_img" type="hidden" value="" /> 
            <a href="javascript:;" class="layui-btn test" id="upload_img">上传图片</a>
            <div class="img_show"></div>
        </div>
    </div> 
    
      
</form>  
</div>  
<script>

layui.use('upload', function(){
		var upload = layui.upload;
		//执行实例
		var uploadInst = upload.render({
		  elem: '#upload_img' //绑定元素
		  ,url: 'upload_demo.php?name=upload_img' //上传接口
		  ,done: function(res){
			//上传完毕回调
			console.log(res);
			var data = res.data;
			var url = data.src+"?"+new Date().getTime();
			$("#upload_item .img_show").html('<img src="'+url+'" width="150"/>');				  
			$("input[name=upload_img]").val(url);				  
		  }
		  ,error: function(index, upload){
			//请求异常回调
			layer.closeAll('loading'); //关闭loading
		  }
		});
});
</script>    
               
</body>
</html>