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PHP file upload classification

Feb 18, 2017 pm 04:13 PM
php

<?php
/**
* 文件上传类
* @author lijiamin
* @time 2017-02-17
* @email 1195989301@qq.com
*/
class Upload{

private $allowExt = array(&#39;gif&#39;,&#39;jpg&#39;,&#39;jpeg&#39;,&#39;bmp&#39;,&#39;png&#39;,&#39;swf&#39;);//限制文件上传的后缀名
private $maxSize = 1;//限制最大文件上传1M

/**
* 获取文件的信息
* @param str $flag 上传文件的标识
* @return arr 上传文件的信息数组
*/
public function getInfo($flag){
return $_FILES[$flag];
}

/**
* 获取文件的后缀
* @param str $filename 文件名
* @return str 文件扩展名
*/
public function getExt($filename){
return pathinfo($filename,PATHINFO_EXTENSION);
}

/**
* 检测上传文件是否合法
* @param str $filename 文件名
* @return bool 文件扩展名是否合法
*/
private function checkExt($filename){
$ext = $this->getExt($filename);
return in_array($ext,$this->allowExt);
}

/**
* 检测文件大小是否超过限制
* @param int size 文件大小
* @return bool 文件大小是否超过限制
*/
public function checkSize($size){
return $size < $this->maxSize * 1024 * 1024;
}

/**
* 随机的文件名
* @param int $len 随机文件名的长度
* @return str 随机字符串
*/
public function randName($len=6){
return substr(str_shuffle(&#39;abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ234565789&#39;),0,$len);
}

/**
* 创建文件上传到的路径
* @return str 文件上传的路径
*/ 
public function createDir(){
//上传文件路径
$dir = &#39;./upload/&#39;.date(&#39;Y/m/d&#39;,time());

//判断文件夹是否存在,不存在则新建
if(is_dir($dir) || mkdir($dir,0777,true)){
return $dir;
}
}

/**
* 文件上传
* @param str $flag 文件上传标识
* @return array 返回上传文件名、保存路径
*/
public function uploadFile($flag){
if($_FILES[$flag][&#39;name&#39;] === &#39;&#39; || $_FILES[$flag][&#39;error&#39;] !== 0){
echo "没有上传文件";
return;
}

$info = $this->getInfo($flag);

if(!$this->checkExt($info[&#39;name&#39;])){
echo "不支持的文件类型";
return;
}
if(!$this->checkSize($info[&#39;size&#39;])){
echo "文件大小超过限制";
return;
}
$filename = $this->randName().&#39;.&#39;.$this->getExt($info[&#39;name&#39;]);

$dir = $this->createDir();

if(!move_uploaded_file($info[&#39;tmp_name&#39;], $dir.&#39;/&#39;.$filename)){
echo "文件上传失败";
}else{
return array(&#39;filename&#39;=>$filename,&#39;dir&#39;=>$dir);
}
}

}
?>
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