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This article mainly shares with you the relevant code of the PHP file upload class and the PHP encapsulated multi-file upload class. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.


<?php
$upload = new UpLoad();
$upload->uploadFile(&#39;fm&#39;);
/*打印错误信息*/
// var_dump($upload->errorNumber);
// var_dump($upload->errorInfo);
class UpLoad{
  //文件上传路径
  protected $path = &#39;upload/&#39;;
  //允许文件上传的后缀
  protected $allowSuffix = [&#39;jpg&#39;,&#39;jpeg&#39;,
  &#39;gif&#39;,&#39;wbmp&#39;,&#39;png&#39;];
  //mime类型 
  protected $allowMime =[&#39;image/jpg&#39;,&#39;image/jpeg&#39;,
  &#39;image/gif&#39;,&#39;image/wbmp&#39;,&#39;image/png&#39;];
  //允许上传的大小
  protected $maxSize = 2000000;
  //是否启用默认的前缀
  protected $isRandName =true ;
  //文件的前缀
  protected $prefix = &#39;up_&#39;;
  //错误号和错误信息
  protected $errorNumber;
  protected $errorInfo;
  //文件的信息
  //文件名
  protected $oldName;
  //文件的后缀
  protected $suffix;
  //文件的大小
  protected $size;
  //文件的mime
  protected $mime;
  //文件的临时文件的路径
  protected $tmpName;
  //文件新名字
  protected $newName;
  
  //构造方法
  //因为成员属性比较多就用数组来显示
  public function __construct($arr =[]){
    foreach ($arr as $key=>$value){
      $this->setOption($key,$value);
    }
  }
  //判断$key是不是我的成员属性,如果是就设置
  protected function setOption($key,$value){
    //得到所有的成员属性
    $keys = array_keys(get_class_vars(__CLASS__));
    if(in_array($key, $keys)){
      $this->$key = $value;
    }
  }
  //文件上传函数
  //key 就是input框中的name属性值
  public function uploadFile($key){
    //判断有没有设置路径 path
    if(empty($this->path)){
      $this->setOption(&#39;errorNumber&#39;,-1 );
      return false;
    }
    //判断该路径是否存在是否可写
    if (!$this->check()){
      $this->setOption(&#39;errorNumber&#39;, -2);
      return false; 
    }
    //判断$_FILES里面的error信息是否为0,如果为0则说明文件信息在服务器端可以直接获取,提取信息保存到成员属性中
    $error = $_FILES[$key][&#39;error&#39;];
    if($error){
      $this->setOption(&#39;errorNumber&#39;, -3);
      return false;
    }else {
      //提取文件相关信息并且保存到成员属性中
      $this->getFileInfo($key);
    }
    //判断文件的大小、mime、后缀是否符合
     if(!$this->checkSize() || !$this->checkMime()|| !$this->checkSuffix()){
       return false;
     }
    //得到新的文件名字
    $this->newName = $this->createNewName();
    //判断是否是上传文件,并且是移动上传文件
    if(is_uploaded_file($this->tmpName)){
      if(move_uploaded_file($this->tmpName, $this->path.$this->newName)){
        return $this->path.$this->newName;
      }else {
        $this->setOption(&#39;errorNumber&#39;, -7);
        return false;
      }
    }else{
      $this->setOption(&#39;errorNumber&#39;, -6);
      return false;
    }
  }
  //检测文件夹是否存在,是否可写
  protected function check(){
    //文件夹不存在或者不是目录。创建文件夹
    if(!file_exists($this->path) ||!is_dir($this->path)){
      return mkdir($this->path,0777,true);
    }
    //判断文件是否可写
    if(!is_writeable($this->path)){
      return chmod($this->path, 0777);
    }
    return true;
  }
  //根据key得到文件信息
  protected function getFileInfo($key){
    //得到文件的名字
    $this->oldName = $_FILES[$key][&#39;name&#39;];
    //得到文件的mime类型
    $this->mime = $_FILES[$key][&#39;type&#39;];
    //得到文件的临时文件
    $this->tmpName = $_FILES[$key][&#39;tmp_name&#39;];
    //得到文件大小
    $this->size = $_FILES[$key][&#39;size&#39;];
    //得到文件后缀
    $this->suffix = pathinfo($this->oldName)[&#39;extension&#39;];
  }
  //判断文件大小
  protected function checkSize(){
    if($this->size > $this->maxSize){
      $this->setOption(&#39;errorNumber&#39;, -3);
      return false;
    }
    return true;
  }
  //判断mime类型
  protected function checkMime(){
    if(!in_array($this->mime, $this->allowMime)){
      $this->setOption(&#39;errorNumber&#39;, -4);
      return false;
    }
    return true;
  }
  //判断后缀
  protected function checkSuffix(){
    if(!in_array($this->suffix, $this->allowSuffix)){
      $this->setOption(&#39;errorNumber&#39;, -5);
      return false;
    }
    return true;
  }
  //创建新名字
  protected function createNewName(){
    if($this->isRandName){
      $name = $this->prefix.uniqid().&#39;.&#39;.$this->suffix;
    }else {
      $name = $this->prefix.$this->oldName;
    }
    return $name;
  }
  public function __get($name){
    if($name == &#39;errorNumber&#39;){
      return $this->errorNumber;
    }elseif ($name == &#39;errorInfo&#39;){
      return $this->getErrorInfo();
    }
  }
  protected function getErrorInfo(){
    switch ($this->errorNumber){
    case -1:
      $str = &#39;文件路径没有设置&#39;;
      break;
    case -2:
      $str = &#39;文件不是目录或者不可写&#39;;
      break;
    case -3:
      $str = &#39;文件超过指定大小&#39;;
      break;
    case -4:
      $str = &#39;mime类型不符合&#39;;
      break;
    case -5:
      $str = &#39;文件后缀不符合&#39;;
      break;
    case -6:
      $str = &#39;不是上传文件&#39;;
      break;
    case -7:
      $str = &#39;移动失败&#39;;
      break;
    case 1:
      $str = &#39;超出ini设置大小&#39;;
      break;
    case 2:
      $str = &#39;超出html表单大小&#39;;
      break;
    case 3:
      $str = &#39;文章只有部分上传&#39;;
      break;
    case 4:
      $str = &#39;没有文件上传&#39;;
      break;
    case 6:
      $str = &#39;找不到临时文件&#39;;
      break;
    case 7:
      $str = &#39;文件写入失败&#39;;
      break;
    }
    return $str;
  }
}


<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>文件上传</title>
</head>
<body>
<form action="UpLoad.php" method="post" enctype="multipart/form-data" >
   <input type="file" name="fm" value=""><br>
  <input type="submit" value="上传文件" /><br>
 
</form>
</body>
</html>

Note: The name in must be the same as the name in the upload class The values ​​passed in uploadFile are consistent!

Examples and usage details of multiple file upload classes encapsulated in PHP:

<?php
/**//*
 * @(#)UploadFile.php
 *
 * 可同时处理用户多个上传文件。效验文件有效性后存储至指定目录。
 * 可返回上传文件的相关有用信息供其它程序使用。(如文件名、类型、大小、保存路径)
 * 使用方法请见本类底部(UploadFile类使用注释)信息。
 *
 */
class UploadFile {
 var $user_post_file = array(); //用户上传的文件
 var $save_file_path;  //存放用户上传文件的路径
 var $max_file_size;   //文件最大尺寸
 var $last_error;   //记录最后一次出错信息
 //默认允许用户上传的文件类型
 var $allow_type = array(&#39;gif&#39;, &#39;jpg&#39;, &#39;png&#39;, &#39;zip&#39;, &#39;rar&#39;, &#39;txt&#39;, &#39;doc&#39;, &#39;pdf&#39;);
 var $final_file_path; //最终保存的文件名
 var $save_info = array(); //返回一组有用信息,用于提示用户。
 /**//**
 * 构造函数,用与初始化相关信息,用户待上传文件、存储路径等
 *
 * @param Array $file 用户上传的文件
 * @param String $path 存储用户上传文件的路径
 * @param Integer $size 允许用户上传文件的大小(字节)
 * @param Array $type  此数组中存放允计用户上传的文件类型
 */
 function UploadFile($file, $path, $size = 2097152, $type = &#39;&#39;) {
 $this->user_post_file = $file;
 $this->save_file_path = $path;
 $this->max_file_size = $size; //如果用户不填写文件大小,则默认为2M.
 if ($type != &#39;&#39;)
  $this->allow_type = $type;
 }
 /**//**
 * 存储用户上传文件,检验合法性通过后,存储至指定位置。
 * @access public
 * @return int  值为0时上传失败,非0表示上传成功的个数。
 */
 function upload() {
 for ($i = 0; $i < count($this->user_post_file[&#39;name&#39;]); $i++) {
  //如果当前文件上传功能,则执行下一步。
  if ($this->user_post_file[&#39;error&#39;][$i] == 0) {
  //取当前文件名、临时文件名、大小、扩展名,后面将用到。
  $name = $this->user_post_file[&#39;name&#39;][$i];
  $tmpname = $this->user_post_file[&#39;tmp_name&#39;][$i];
  $size = $this->user_post_file[&#39;size&#39;][$i];
  $mime_type = $this->user_post_file[&#39;type&#39;][$i];
  $type = $this->getFileExt($this->user_post_file[&#39;name&#39;][$i]);
  //检测当前上传文件大小是否合法。
  if (!$this->checkSize($size)) {
   $this->last_error = "The file size is too big. File name is: ".$name;
   $this->halt($this->last_error);
   continue;
  }
  //检测当前上传文件扩展名是否合法。
  if (!$this->checkType($type)) {
   $this->last_error = "Unallowable file type: .".$type." File name is: ".$name;
   $this->halt($this->last_error);
   continue;
  }
  //检测当前上传文件是否非法提交。
  if(!is_uploaded_file($tmpname)) {
   $this->last_error = "Invalid post file method. File name is: ".$name;
   $this->halt($this->last_error);
   continue;
  }
  //移动文件后,重命名文件用。
  $basename = $this->getBaseName($name, ".".$type);
  //移动后的文件名
  $saveas = $basename."-".time().".".$type;
  //组合新文件名再存到指定目录下,格式:存储路径 + 文件名 + 时间 + 扩展名
  $this->final_file_path = $this->save_file_path."/".$saveas;
  if(!move_uploaded_file($tmpname, $this->final_file_path)) {
   $this->last_error = $this->user_post_file[&#39;error&#39;][$i];
   $this->halt($this->last_error);
   continue;
  }
  //存储当前文件的有关信息,以便其它程序调用。
  $this->save_info[] = array("name" => $name, "type" => $type,
      "mime_type" => $mime_type,
               "size" => $size, "saveas" => $saveas,
               "path" => $this->final_file_path);
  }
 }
 return count($this->save_info); //返回上传成功的文件数目
 }
 /**//**
 * 返回一些有用的信息,以便用于其它地方。
 * @access public
 * @return Array 返回最终保存的路径
 */
 function getSaveInfo() {
 return $this->save_info;
 }
 /**//**
 * 检测用户提交文件大小是否合法
 * @param Integer $size 用户上传文件的大小
 * @access private
 * @return boolean 如果为true说明大小合法,反之不合法
 */
 function checkSize($size) {
 if ($size > $this->max_file_size) {
  return false;
 }
 else {
  return true;
 }
 }
 /**//**
 * 检测用户提交文件类型是否合法
 * @access private
 * @return boolean 如果为true说明类型合法,反之不合法
 */
 function checkType($extension) {
 foreach ($this->allow_type as $type) {
  if (strcasecmp($extension , $type) == 0)
  return true;
 }
 return false;
 }
 /**//**
 * 显示出错信息
 * @param $msg  要显示的出错信息
 * @access private
 */
 function halt($msg) {
 printf("<b><UploadFile Error:></b> %s <br>\n", $msg);
 }
 /**//**
 * 取文件扩展名
 * @param String $filename 给定要取扩展名的文件
 * @access private
 * @return String   返回给定文件扩展名
 */
 function getFileExt($filename) {
 $stuff = pathinfo($filename);
 return $stuff[&#39;extension&#39;];
 }
 /**//**
 * 取给定文件文件名,不包括扩展名。
 * eg: getBaseName("j:/hexuzhong.jpg"); //返回 hexuzhong
 *
 * @param String $filename 给定要取文件名的文件
 * @access private
 * @return String 返回文件名
 */
 function getBaseName($filename, $type) {
 $basename = basename($filename, $type);
 return $basename;
 }
}
/**//******************** UploadFile类使用注释
//注意,上传组件name属性不管是一个还是多个都要使用数组形式,如:
<input type="file" name="user_upload_file[]">
<input type="file" name="user_upload_file[]">
//如果用户点击了上传按钮。
if ($_POST[&#39;action&#39;] == "上传") {
 //设置允许用户上传的文件类型。
 $type = array(&#39;gif&#39;, &#39;jpg&#39;, &#39;png&#39;, &#39;zip&#39;, &#39;rar&#39;);
 //实例化上传类,第一个参数为用户上传的文件组、第二个参数为存储路径、
 //第三个参数为文件最大大小。如果不填则默认为2M
 //第四个参数为充许用户上传的类型数组。如果不填则默认为gif, jpg, png, zip, rar, txt, doc, pdf
 $upload = new UploadFile($_FILES[&#39;user_upload_file&#39;], &#39;j:/tmp&#39;, 100000, $type);
 //上传用户文件,返回int值,为上传成功的文件个数。
 $num = $upload->upload();
 if ($num != 0) {
 echo "上传成功<br>";
 //取得文件的有关信息,文件名、类型、大小、路径。用print_r()打印出来。
 print_r($upload->getSaveInfo());
 //格式为: Array
 //  (
 //  [0] => Array(
 //    [name] => example.txt
 //    [type] => txt
 //    [size] => 526
 //    [path] => j:/tmp/example-1108898806.txt
 //    )
 //  )
 echo $num."个文件上传成功";
 }
 else {
 echo "上传失败<br>";
 }
}
*/
?>

Related recommendations:

Examples explaining how to implement common file upload classes in PHP

Share php file upload class

Powerful php file upload class

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