Detailed explanation of php form file iframe asynchronous upload example-PHP Tutorial-php.cn

1. Place an iframe element in the form;

2. When the content of the file upload control changes, trigger JS to set the action of the form to the img_upload_process.php file that processes file uploads, and set the target of the form Set to iframe and let the iframe submit to the server for file upload;
3. After the file upload is successfully processed in img_upload_process.php, the file path that was successfully uploaded and saved will be returned to the hidden field in the form;
4. Click When the form submit button is used, JS sets the form action to the form_process.php file that receives the form data, and the target of the form is set to _self.

This article mainly introduces the example of asynchronous upload of PHP form file iframe for everyone. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Form: asyn_uplaod.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片异步上传</title>
</head>
<body>
<!-- application/x-www-form-urlencoded 缺省编码类型 -->
<!-- multipart/form-data 多媒体传输协议 ,方法必须是post 既可以发送文本数据，也支持二进制数据上载 -->
<form action="" method="post" enctype="multipart/form-data">
 用户名: <input type="text" name="username" /><br /> 
 上传头像: <input type="file" id="avator" name="avator" onchange="startUpload(this.form)" />

 <iframe frameborder=&#39;0&#39; width=&#39;0&#39; height=&#39;0&#39; name="uploadframe"></iframe> 
 <input type="hidden" id="save_path" name="save_path" />
 <span id="loading"></span> <br /> 
 <img     style="max-width:90%"Detailed explanation of php form file iframe asynchronous upload example" > <br />
 <input type="submit" name="submitted" value="提交" onclick="formSubmit(this.form)" />

</form>

<script>

function startUpload(formObj){
  document.getElementById(&#39;loading&#39;).innerHTML = &#39;上传中...&#39;; 
  formObj.action = &#39;img_upload_process.php&#39;; 
  formObj.target = &#39;uploadframe&#39;; 
  formObj.submit(); 
}


function formSubmit(formObj) {
 formObj.action = &#39;form_process.php&#39;; 
 formObj.target = &#39;_self&#39;;

 //清空文件上传内容，防止重复提交
 var fileObj = document.getElementById(&#39;avator&#39;) ;

 // for IE, Opera, Safari, Chrome
 if (fileObj.outerHTML) {
  fileObj.outerHTML = fileObj.outerHTML;
 } else { // FF(包括3.5)
  fileObj.value = "";
 }

 formObj.submit(); 
}

</script>

</body>
</html>

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Process file upload: img_upload_process.php

<?php
include &#39;Upload.class.php&#39;;

$file = $_FILES[&#39;avator&#39;];
$upload = new Upload();//上传工具类对象


if($save_path = $upload->up($file)){//上传成功
 echo <<<STR
 <script> 
  window.parent.document.getElementById(&#39;uploaded_img&#39;).src = "$save_path";
  window.parent.document.getElementById(&#39;loading&#39;).innerHTML = &#39;上传成功&#39;; 
  window.parent.document.getElementById(&#39;save_path&#39;).value = "$save_path"; 
 </script>
STR;

}else{
 $error = $upload->error();
 echo <<<STR
 <script>
  window.parent.document.getElementById(&#39;uploaded_img&#39;).src = "";
  window.parent.document.getElementById(&#39;loading&#39;).innerHTML = "上传失败: $error";
 </script>
STR;

}

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File upload tool class: Upload.class.php

<?php
class Upload{
 private $path; //文件上传目录
 private $max_size; //上传文件大小限制
 private $errno; //错误信息号
 private $mime = array(&#39;image/jpeg&#39;,&#39;image/png&#39;,&#39;image/gif&#39;);//允许上传的文件类型

 /**
  * 构造函数,
  * @access public
  * @param $path string 上传的路径
  */
 public function __construct($path = &#39;./&#39; ){
  $this->path = $path;
  $this->max_size = 1000000;
 }

 /**
  * 文件上传的方法，分目录存放文件
  * @access public
  * @param $file array 包含上传文件信息的数组
  * @return mixed 成功返回上传的文件名，失败返回false
  */
 public function up($file){
  //判断文件是否是通过 HTTP POST 上传，防止恶意欺骗
  /*
  if (! is_uploaded_file($file[&#39;tmp_name&#39;])) {
   $this->errno = 5; //设置错误信息号为5，表示非法上传
   return false;
  }
  */

  //判断是否从浏览器端成功上传到服务器端
  if ($file[&#39;error&#39;] == 0) {
   # 上传到临时文件夹成功,对临时文件进行处理
   //上传类型判断
   if (!in_array($file[&#39;type&#39;], $this->mime)) {
    # 类型不对
    $this->errno = -1; 
    return false;
   }

   //判断文件大小
   if ($file[&#39;size&#39;] > $this->max_size) {
    # 大小超出配置文件的中的上传限制
    $this->errno = -2;
    return false;
   }

   //获取存放上传文件的目录
   $sub_path = date(&#39;Ymd&#39;).&#39;/&#39;;
   if (!is_dir($this->path . $sub_path)) {
    # 不存在该目录，创建之
    mkdir($this->path . $sub_path);
   }

   //文件重命名,由当前日期 + 随机数 + 后缀名
   $file_name = date(&#39;YmdHis&#39;).uniqid().strrchr($file[&#39;name&#39;], &#39;.&#39;);

   //准备就绪了，开始上传
   if (move_uploaded_file($file[&#39;tmp_name&#39;], $this->path . $sub_path . $file_name)) {
    # 移动成功
    return $sub_path . $file_name;
   } else {
    # 移动失败
    $this->errno = -3;
    return false;
   }

  } else {
   # 上传到临时文件夹失败，根据其错误号设置错误号
   $this->errno = $file[&#39;error&#39;];
   return false;
  }

 }

 /**
  * 多文件上传方法
  * @access public
  * @param $file array 包含上传文件信息的数组，是一个二维数组
  * @return array 成功返回上传的文件名构成的数组, ?如果有失败的则不太好处理了
  */
 public function multiUp($files){
  //在多文件上传时，上传文件信息 又是一个多维数组，如$_FILES[&#39;userfile&#39;][&#39;name&#39;][0]，$_FILES[&#39;userfile&#39;][&#39;name&#39;][1]
  //我们只需要遍历该数组，得到每个上传文件的信息，依次调用up方法即可
  foreach ($files[&#39;name&#39;] as $key => $value) {
   # code...
   $file[&#39;name&#39;] = $files[&#39;name&#39;][$key];
   $file[&#39;type&#39;] = $files[&#39;type&#39;][$key];
   $file[&#39;tmp_name&#39;] = $files[&#39;tmp_name&#39;][$key];
   $file[&#39;error&#39;] = $files[&#39;error&#39;][$key];
   $file[&#39;size&#39;] = $files[&#39;size&#39;][$key];
   //调用up方法，完成上传
   $filename[] = $this->up($file);
  }
  return $filename;
 }

 /**
  * 获取错误信息,根据错误号获取相应的错误提示
  * @access public
  * @return string 返回错误信息
  */
 public function error(){
  switch ($this->errno) {
   case -1:
    return &#39;请检查你的文件类型，目前支持的类型有&#39;.implode(&#39;,&#39;, $this->mime);
    break;
   case -2:
    return &#39;文件超出系统规定的大小，最大不能超过&#39;. $this->max_size;
    break;
   case -3:
    return &#39;文件移动失败&#39;;
    break;
   case 1:
    return &#39;上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值,其大小为&#39;.ini_get(&#39;upload_max_filesize&#39;);
    break;
   case 2:
    return &#39;上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值,其大小为&#39; . $_POST[&#39;MAX_FILE_SIZE&#39;];
    break;
   case 3:
    return &#39;文件只有部分被上传&#39;;
    break;
   case 4:
    return &#39;没有文件被上传&#39;;
    break;
   case 5:
    return &#39;非法上传&#39;;
    break;
   case 6:
    return &#39;找不到临时文件夹&#39;;
    break;
   case 7:
    return &#39;文件写入临时文件夹失败&#39;;
    break;
   default:
    return &#39;未知错误,灵异事件&#39;;
    break;
  }
 }
}

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Processing form submission: form_process.php

<?php
var_dump($_REQUEST);
var_dump($_FILES);

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Click the form submit button result:

Detailed explanation of php form file iframe asynchronous upload example

Code download: php form file iframe asynchronous upload

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