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Detailed explanation of methods and examples of PHP file upload class

墨辰丷
墨辰丷Original
2018-06-04 09:51:281351browse

这篇文章主要介绍了PHP文件上传类,结合实例形式详细分析了PHP上传文件类的实现代码与相关使用技巧,需要的朋友可以参考下

这里演示了FileUpload.class.php文件上传类,其中用到了两个常量,可在网站配置文件中定义:

define('ROOT_PATH',dirname(__FILE__)); //网站根目录
define('UPDIR','/uploads/'); //上传主目录

具体代码如下:

error = $_FILES[$_file]['error'];
       $this->maxsize = $_maxsize / 1024;
       $this->type = $_FILES[$_file]['type'];
       $this->path = ROOT_PATH.UPDIR;
       $this->linktotay = date('Ymd').'/';
       $this->today = $this->path.$this->linktotay;
       $this->name = $_FILES[$_file]['name'];
       $this->tmp = $_FILES[$_file]['tmp_name'];
       $this->checkError();
       $this->checkType();
       $this->checkPath();
       $this->moveUpload();
    }
    //返回路径
    public function getPath() {
       $_path = $_SERVER["SCRIPT_NAME"];
       $_dir = dirname(dirname($_path));
       if ($_dir == '\\') $_dir = '/';
       $this->linkpath = $_dir.$this->linkpath;
       return $this->linkpath;
    }
    //移动文件
    private function moveUpload() {
       if (is_uploaded_file($this->tmp)) {
         if (!move_uploaded_file($this->tmp,$this->setNewName())) {
            Tool::alertBack('警告:上传失败!');
         }
       } else {
         Tool::alertBack('警告:临时文件不存在!');
       }
    }
    //设置新文件名
    private function setNewName() {
       $_nameArr = explode('.',$this->name);
       $_postfix = $_nameArr[count($_nameArr)-1];
       $_newname = date('YmdHis').mt_rand(100,1000).'.'.$_postfix;
       $this->linkpath = UPDIR.$this->linktotay.$_newname;
       return $this->today.$_newname;
    }
    //验证目录
    private function checkPath() {
       if (!is_dir($this->path) || !is_writeable($this->path)) {
         if (!mkdir($this->path)) {
            Tool::alertBack('警告:主目录创建失败!');
         }
       }
       if (!is_dir($this->today) || !is_writeable($this->today)) {
         if (!mkdir($this->today)) {
            Tool::alertBack('警告:子目录创建失败!');
         }
       }
    }
    //验证类型
    private function checkType() {
       if (!in_array($this->type,$this->typeArr)) {
         Tool::alertBack('警告:不合法的上传类型!');
       }
    }
    //验证错误
    private function checkError() {
       if (!empty($this->error)) {
         switch ($this->error) {
            case 1 :
              Tool::alertBack('警告:上传值超过了约定最大值!');
              break;
            case 2 :
              Tool::alertBack('警告:上传值超过了'.$this->maxsize.'KB!');
              break;
            case 3 :
              Tool::alertBack('警告:只有部分文件被上传!');
              break;
            case 4 :
              Tool::alertBack('警告:没有任何文件被上传!');
              break;
            default:
              Tool::alertBack('警告:未知错误!');
         }
       }
    }
  }
?>

其中,用到了一个静态工具类 Tool.class.php,代码如下:

Tool.class.php

alert('$_info');history.back();";
       exit();
     }     //弹窗赋值关闭
     static public function alertOpenerClose($_info,$_path) {
       echo "";
       echo "";
       echo "";
       echo "";
       echo "";
       exit();
     } }
?>

下面进行一个实例演示,请看下面的步骤:

1、先创建一个 index.php 页面,做一个表单

index.php



  
     
     main
  
( * 必须是jpg,gif,png,并且200k内)

2、创建 upfile.html 文件,建立表单提交到 upload.php

upfile.html



  
    
    上传图片
  

3、通过 upload.php 文件调用文件上传类实现上传,并且把路径赋给 input 标签和显示图片

getPath();
    Tool::alertOpenerClose('文件上传成功!',$_path);
  } else {
    Tool::alertBack('警告:文件过大或者其他未知错误导致浏览器崩溃!');
  }
?>

总结:以上就是本篇文的全部内容,希望能对大家的学习有所帮助。

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