Detailed explanation of php file upload class examples

This article mainly introduces the PHP file upload class. It analyzes the type judgment of PHP upload files, computer size restrictions and other techniques in the form of a complete example. Friends in need can refer to it.

The details are as follows:

/**
$file=new class_file($file_array,"flash/");
 $file->set_allow_type(array("jpg","jpeg","gif"));
 $file->is_limit_size();
 if(!$file->allow_file_size()){
   echo $file->error;
   exit;
 }
 if(!$file->allow_file_type()){
    echo $file->error;
    exit();
  }else if(!$file->uploadfile()){
  echo $file->error;
  exit;
 }
**/
<?php
 class class_file{
   private $file_type;
   private $file_size;
   private $save_path;
   private $file_path;
   private $allow_type=array();
   private $allow_size;
   private $file_name;
   private $flag=false;
   private $mime_type;
   private $is_limit_size=false;
   public $error;
   //构造函数
  function class_file($file_array,$save_path){
       $this->file_path=$file_array[&#39;tmp_name&#39;];
       $this->file_size=$file_array[&#39;size&#39;];
       $this->file_type=$file_array[&#39;type&#39;];
       $this->save_path=$save_path;
    }
    //设置允许的文件类型
   function set_allow_type($allow_type){
      $this->allow_type=$allow_type;
    }
    //设置允许的文件大小
   function set_allow_size($allow_size){
      $this->allow_size=$allow_size;
    }
    //文件上传
   public function uploadfile(){
     if(!$this->allow_file_type()){
     $this->file_name();
     }
     if(move_uploaded_file($this->file_path,$this->save_path.$this->file_name)){
       return true;
     }else{
       $this->error="文件上传失败";
       return;
     }
   }
//判断文件上传的类型
   function allow_file_type(){
     $this->file_name();
     if(in_array($this->mime_type,$this->allow_type)){
         return true;
       }else{
         $this->error="不允许上传的类型";
         exit();
       }
   }
 //判断文件上传的大小
   function allow_file_size($size=100){
     if($this->is_limit_size){
     $this->set_allow_size($size);
     if($this->allow_size>=$this->file_size){
       return true;
     }else{
       $this->error="超过文件上传大小限制";
     }
     }
   }
 //是否限制文件大小
   function is_limit_size(){
     $this->is_limit_size=true;
   }
//文件类型和文件名称
   function file_name(){
    $this->mime_type=substr($this->file_type,strpos($this->file_type,"/")+1);
   if($this->mime_type=="pjpeg"){
     $this->mime_type="jpg";
    }
   if($this->mime_type=="x-ms-wma"){
      $this->mime_type="wma";
    }
    if($this->mime_type=="x-ms-wmv"){
      $this->mime_type="wmv";
    }
    $this->file_name=date("YmdHis").".$this->mime_type";
   }
   function _get_file_name(){
     return $this->file_name;
   }
 }
?>

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