本文实例为大家分享了php文件上传类的具体代码，供大家参考，具体内容如下

<?php
$upload = new UpLoad();
$upload->uploadFile("fm");
/*打印错误信息*/
// var_dump($upload->errorNumber);
// var_dump($upload->errorInfo);
class UpLoad{
  //文件上传路径
  protected $path = "upload/";
  //允许文件上传的后缀
  protected $allowSuffix = ["jpg","jpeg",
  "gif","wbmp","png"];
  //mime类型 
  protected $allowMime =["image/jpg","image/jpeg",
  "image/gif","image/wbmp","image/png"];
  //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 = "up_";
  //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)){
      $this->setOption("errorNumber",-1 );
      return false;
    }
    //判断该路径是否存在是否可写
    if (!$this->check()){
      $this->setOption("errorNumber", -2);
      return false; 
    }
    //判断$_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]["error"];
    if($error){
      $this->setOption("errorNumber", -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("errorNumber", -7);
        return false;
      }
    }else{
      $this->setOption("errorNumber", -6);
      return false;
    }
  }
  //检测文件夹是否存在，是否可写
  protected function check(){
    //文件夹不存在或者不是目录。创建文件夹
    if(!file_exists($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]["name"];
    //得到文件的mime类型
    $this->mime = $_FILES[$key]["type"];
    //得到文件的临时文件
    $this->tmpName = $_FILES[$key]["tmp_name"];
    //得到文件大小
    $this->size = $_FILES[$key]["size"];
    //得到文件后缀
    $this->suffix = pathinfo($this->oldName)["extension"];
  }
  //判断文件大小
  protected function checkSize(){
    if($this->size > $this->maxSize){
      $this->setOption("errorNumber", -3);
      return false;
    }
    return true;
  }
  //判断mime类型
  protected function checkMime(){
    if(!in_array($this->mime, $this->allowMime)){
      $this->setOption("errorNumber", -4);
      return false;
    }
    return true;
  }
  //判断后缀
  protected function checkSuffix(){
    if(!in_array($this->suffix, $this->allowSuffix)){
      $this->setOption("errorNumber", -5);
      return false;
    }
    return true;
  }
  //创建新名字
  protected function createNewName(){
    if($this->isRandName){
      $name = $this->prefix.uniqid().".".$this->suffix;
    }else {
      $name = $this->prefix.$this->oldName;
    }
    return $name;
  }
  public function __get($name){
    if($name == "errorNumber"){
      return $this->errorNumber;
    }elseif ($name == "errorInfo"){
      return $this->getErrorInfo();
    }
  }
  protected function getErrorInfo(){
    switch ($this->errorNumber){
    case -1:
      $str = "文件路径没有设置";
      break;
    case -2:
      $str = "文件不是目录或者不可写";
      break;
    case -3:
      $str = "文件超过指定大小";
      break;
    case -4:
      $str = "mime类型不符合";
      break;
    case -5:
      $str = "文件后缀不符合";
      break;
    case -6:
      $str = "不是上传文件";
      break;
    case -7:
      $str = "移动失败";
      break;
    case 1:
      $str = "超出ini设置大小";
      break;
    case 2:
      $str = "超出html表单大小";
      break;
    case 3:
      $str = "文章只有部分上传";
      break;
    case 4:
      $str = "没有文件上传";
      break;
    case 6:
      $str = "找不到临时文件";
      break;
    case 7:
      $str = "文件写入失败";
      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>

注意：input中的name必须和上传类中的uploadFile中是传值一致！

更多精彩内容请参考php文件上传操作汇总进行学习。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持网页设计。