php文件上传类的分享

<?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>