php 上传文件代码

1. 图片上传的php 代码

<?php
    session_start();
    $number = isset($_POST['typename'])? $_POST['typename'] : '';
    $_SESSION['id'] = $number;
    $response = array();
    $_SESSION['count']=count($_FILES['image']['name']);
      for($i=0;$i<count($_FILES['image']['name']);$i++) {
          $type=$_FILES['image']['type'];
          $__filename = time() .rand(). substr($_FILES['image']['name'][$i], strrpos($_FILES['image']['name'][$i], '.'));
          $filename = './picture/' . $__filename;
          if (move_uploaded_file($_FILES['image']['tmp_name'][$i], $filename)) {
             $file_name = image($__filename,$type);
              $session=$_SESSION['id'];
             insert1($session,$file_name,$__filename);
          }
          else
          {
              echo '上传失败';
          }
      }
    function insert1($session,$file_name,$__filename)
    {
        include 'conn.php';
        $p="INSERT INTO `photo`(`Tid`, `Tphotoslt`, `Tphotoname`) VALUES ('".$session."','".$file_name."','".$__filename."')";
        mysqli_query($con,$p);
        echo '上传成功';
    }
    function  image($images,$type)
    {
       for($i=0;$i<count($type);$i++)
       {
           if($type[$i]=='image/jpeg')
           {
               $image=imagecreatefromjpeg("./picture/".$images);//新建1.png 图片
           }
           else{
               if($type[$i]=='image/gif')
               {
                   $image=imagecreatefromgif("./picture/".$images);//新建1.png 图片
               }
               else{
                   if($type[$i]=='image/png')
                   {
                       $image=imagecreatefrompng("./picture/".$images);//新建1.png 图片
                   }
               }

           }

       }
        $width=imagesx($image);//获取原图的width
        $height=imagesy($image);//获取原图的height
        if($width>2500 && $height>1500)
        {
            $thumb_width=$width*0.1;//缩略图的$thumb_width 的 width
            $thumb_height=$height *0.1;///缩略图的$thumb_height 的 height
        }
        else
        {
            if($width>1500 && $height>1000)
            {
                $thumb_width=$width*0.2;//缩略图的$thumb_width 的 width
                $thumb_height=$height *0.2;///缩略图的$thumb_height 的 height
            }
            else
            {
                if($width>800 &&  $height>800)
                {
                    $thumb_width=$width*0.3;//缩略图的$thumb_width 的 width
                    $thumb_height=$height *0.3;///缩略图的$thumb_height 的 height
                }
                else{
                    $thumb_width=$width*0.4;//缩略图的$thumb_width 的 width
                    $thumb_height=$height *0.4;///缩略图的$thumb_height 的 height
                }
            }
        }


        $thumb=imagecreatetruecolor($thumb_width,$thumb_height);//创建一个原图一半大小的画布
        imagecopyresampled($thumb,$image,0,0,0,0,$thumb_width,$thumb_height,$width,$height);//将原图按指定大小复制到画布上，得到缩略图
        imagejpeg($thumb,"./picture/img_".$images);//将缩略图保存在文件里
        imagedestroy($thumb);//清除占用的内存
        return 'img_'.$images;
    }
?>

2. html 上次界面代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link href="Backstage.css" rel="stylesheet" type="text/css">
</head>
<body>
<form  name="form1" id="form1">
   <select name="typename" id="typename">
       <option>--请选选择--</option>
   </select>
    <br>
    <br>
    <span>+文件上传</span>
    <input type="file" value="" name="image[]" id="image" multiple="multiple">
    <br> <br>
</form>
<button>
    上传图片
</button>
<div id="upload">
</div>
<script>
    function $(id) {
        return document.querySelector(id);
    }
    //查看图片显示
    $('#image').addEventListener('change',function () {
        if(typeof FileReader== "undefined")
        {
            alert("检测到你的浏览器不支持FileReader对象!");
        }
        var strHTML="";
        var file=this.files;
        for(var inti=0,len=file.length;inti<len;inti++)
        {
            var tmpFile=file[inti];
            var reader=new FileReader();
            reader.readAsDataURL(tmpFile);
            reader.onload=function (e) {
                strHTML=strHTML+"<span>";
                strHTML=strHTML+"<img src='"+e.target.result+"' width='200px' height='200px' alt=''/>";
                strHTML=strHTML+"</span>";
                $("#upload").innerHTML="<li>"+strHTML+"</li>";
            }
        }
    });
    //获取图片的分类
    var image =function() {
        var oReq = new XMLHttpRequest();
        oReq.onreadystatechange = function () {
            if (oReq.readyState == 4) {
                if (oReq.status == 200) {
                  //console.log(oReq.responseText);
                    var json=JSON.parse(oReq.responseText);
                    typename(json);
                }
            }
        };
        oReq.open("POST", "typename.php");
        oReq.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
        oReq.send(null);
    };
    image();
    //循环分类数据
    function  typename(data) {
        var option;
        for(var i=0,len=data.length;i<len;i++)
        {
            option=document.createElement('option');
            option.setAttribute('value',data[i]['Tid']);
            option.appendChild(document.createTextNode(data[i]['Tname']));
            $('#typename').appendChild(option);
        }
    }
    //上传图片显示  formdata
    $('button').addEventListener('click',function () {
            var form = $("#form1");
            var formData = new FormData(form);
            if(formData.getAll('typename')=="--请选选择--")
            {
                alert('请选择类型上传');
                return;
            }
            var oReq = new XMLHttpRequest();
            oReq.onreadystatechange = function () {
                if (oReq.readyState == 4) {
                    if (oReq.status == 200) {
                        console.log(oReq.responseText);
                        /// var json=JSON.parse(oReq.responseText);
                    }
                }
            };
            oReq.open("POST", "backstage.php");
            oReq.send(formData);
            return false;
    });
</script>
</body>
</html>

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