<meta charset="utf-8" > 
    <form id= "uploadForm">  
       <p >指定文件名： <input type="text" name="filename" value= ""/></p >  
        <p> 
         上传文件：  
         <input type="file" name="photo" onchange="showPreview(this)" class="file" /> 
         <img id="portrait" src="/UploadFiles/2021-04-02/">

submit.php


<"上传文件失败"; 
    die; 
  } 
  $dir='./photo/'; 
  $type=substr($_FILES['photo']['name'],strrpos($_FILES['photo']['name'],'.')); 
  $filename=time().rand(1000,9999).$type; 
  if(is_uploaded_file($_FILES['photo']['tmp_name'])){ 
    move_uploaded_file($_FILES['photo']['tmp_name'],$dir.$filename); 
    echo "上传成功"; 
  }else{ 
    echo "上传文件失败"; 
  } 


遍历数据库数据  


 <"content-type:text/html;charset=utf-8"); 
  $link=mysql_connect("127.0.0.1",'root','root'); 
  mysql_select_db("php9",$link); 
  mysql_query("set names utf8"); 
  //查询数据中的总条数 
  $sql="select count(id) as count from upload"; 
  $arr=mysql_query($sql); 
  $result=mysql_fetch_assoc($arr); 
  //获得总条数 
  $size=$result['count']; 
  //每页显示2条数据 
  $length=6; 
  //计算出多少页 
  $pages=ceil($size/$length); 
  $page=isset($_GET['page'])"select * from upload limit $start,$length"; 
  $res=mysql_query($sql); 
  "1"> 
    <div> 
      <"photo.php" rel="external nofollow" ><img src="/UploadFiles/2021-04-02/<">

下载代码


 <"content-type:text/html;charset=utf-8"); 
  $dir=$_GET['dir']; 
  $filename=substr($dir,strrpos($dir,'/')+1); 
  header("Content-type:image"); 
  header("content-disposition:attachment;filename=$filename"); 
  readfile($dir); 
  ?> 


以上所述是小编给大家介绍的PHP中ajax无刷新上传图片与图片下载功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！