PHP实现文件上传

川长思鸟来 2022-07-26 00:29 259阅读 0赞

工具类如下：

<?php 
    	class UploadHelper {
    		//上传文件数组的名称
    		private $fileName;
    		//允许上传的最大值
    		private $maxSize;
    		//允许的上传类型
    		private $allowMime;
    		//文件扩展名
    		private $allowExt;
    		//上传文件到服务器的路径
    		private $uploadPath;
    		//是否只允许上传图片
    		private $imgFlag;
    		//上传文件信息
    		private $fileInfo;
    		//上传错误码，1为正确
    		private $code = 1;
    		//上传错误信息
    		private $error = 'success';
    		//文件扩展名
    		private $ext;
    		//上传文件的地址：路径+文件名
    		private $destination;
    
    
    
    		/**
    		* 构造函数，这里面的参数都是默认的，在实际使用中，其实只需要指定一下
    		* uploadPath上传路径和imgFlag是否限制只允许上传图片即可
    		* @param $uploadPath 上传到服务器的路径
    		* @param $imgFlag 是否限制只允许上传图片
    		* @param $maxSize 允许上传的最大值
    		* @param $allowExt 允许上传文件的后缀名
    		* @param $allowMime 允许上传文件的类型
    		*/
    		public function __construct($uploadPath='./uploads', $imgFlag = true,
    			$maxSize=5242880, $allowExt=''/*array('jpeg', 'jpg', 'png', 'gif')*/, 
    			$allowMime=''/*array('image/jpeg', 'image/png', 'image/gif')*/) {
    
    			$this->maxSize = $maxSize;
    			$this->allowMime = $allowMime;
    			$this->allowExt = $allowExt;
    			$this->uploadPath = $uploadPath;
    			$this->imgFlag = $imgFlag;
    			$this->init();
    		}
    
    		private function init() {
    			$this->fileInfo = array();
    			foreach ($_FILES as $k => $v) {
    				$this->fileInfo = $v;
    			}
    			
    			if (!empty($this->fileInfo)) {
    				$this->ext = strtolower(pathinfo($this->fileInfo['name'], PATHINFO_EXTENSION));
    			}
    			
    		}
    
    		/**
    		* 上传文件
    		* @return 如果上传失败那么就返回false，如果上传成功，那么返回路径
    		*/
    		public function uploadFile() {
    			if (!$this->checkError() || !$this->checkSize() || !$this->checkHTTPPost() || !$this->checkTrueImg()) {
    				return false;
    			}
    			if (!empty($this->allowExt) && !$this->checkExt()) {
    				return false;
    			}
    			if (!empty($this->allowMime) && !$this->checkMime()) {
    				return false;
    			}
    			$this->checkUploadPath();
    			$this->uniName = $this->getUniName();
    			$this->destination = $this->uploadPath . '/' . $this->uniName . '.' . $this->ext;
    			if (!@move_uploaded_file($this->fileInfo['tmp_name'], $this->destination)) {
    				return false;
    			}
    			return $this->destination;
    		}
    
    		/**
    		* 获取错误信息
    		*/
    		public function getError() {
    			return $this->error;
    		}
    
    		/**
    		* 检测上传文件是否出错
    		* @return boolean
    		*/
    		private function checkError() {
    
    			if (empty($this->fileInfo)) {
    				$this->error = '文件上传出错';
    				$this->code = 1001;
    				return false;
    			}
    			
    			if ($this->fileInfo['error'] == 0) {
    				return true;
    			}
    
    			switch ($this->fileInfo['error']) {
    				case 1:
    					$this->error = '超过了PHP配置文件中upload_max_filesize选项的值';
    					$this->code = 1002;
    					break;
    				case 2:
    					$this->error = '超过了表单中MAX_FILE_SIZE设置的值';
    					$this->code = 1003;
    					break;
    				case 3:
    					$this->error = '文件部分被上传';
    					$this->code = 1004;
    					break;
    				case 4:
    					$this->error = '没有选择上传文件';
    					$this->code = 1005;
    					break;
    				case 6:
    					$this->error = '没有找到临时目录';
    					$this->code = 1006;
    					break;
    				case 7:
    					$this->error = '文件不可写';
    					$this->code = 1007;
    					break;
    				case 8:
    					$this->error = '由于PHP的扩展程序中断文件上传';
    					$this->code = 1008;
    					break;
    			}
    			return false;
    		}
    
    		/**
    		* 检测上传文件的大小
    		* @return boolean
    		*/
    		private function checkSize() {
    			if ($this->fileInfo['size'] > $this->maxSize) {
    				$this->error = '上传文件过大';
    				$this->code = 1009;
    				return false;
    			}
    			return true;
    		}
    
    		/**
    		* 检测扩展名
    		* @return boolean
    		*/
    		private function checkExt() {
    			if (!in_array($this->ext, $this->allowExt)) {
    				$this->error = '不允许的扩展名';
    				$this->code = 1010;
    				return false;
    			}
    			return true;
    		}
    
    		/**
    		* 检测文件类型
    		* @return boolean
    		*/
    		private function allowMime() {
    			if (!in_array($this->fileInfo['type'], $this->allowMime)) {
    				$this->error = '不允许的文件类型';
    				$this->code = 1011;
    				return false;
    			}
    			return true;
    		}
    
    		/**
    		* 检测是否是真实图片
    		* @return boolean
    		*/
    		private function checkTrueImg() {
    			if ($this->imgFlag) {
    				if (!@getimagesize($this->fileInfo['tmp_name'])) {
    					$this->error = '不是真实图片';
    					$this->code = 1012;
    					return false;
    				}
    				return true;
    			}
    			return true;
    		}
    
    		/**
    		* 检测是否通过HTTP POST方式上传的
    		* @return boolean
    		*/
    		private function checkHTTPPost() {
    			if (!is_uploaded_file($this->fileInfo['tmp_name'])) {
    				$this->error = '文件不是通过HTTP POST方式上传的';
    				$this->code = 1013;
    				return false;
    			}
    			return true;
    		}
    
    		/**
    		* 检测目录不存在，则创建
    		*/
    		private function checkUploadPath() {
    			if (!file_exists($this->uploadPath)) {
    				mkdir($this->uploadPath, 0777, true);
    			}
    		}
    
    		/**
    		* 产生唯一字符串
    		* @return string
    		*/
    		private function getUniName() {
    			return md5(uniqid(microtime(true), true));
    		}
    
    
    	}
     ?>

使用方法如下：

<!doctype html>
    <html lang="en">
    <head>
    	<meta charset="UTF-8">
    	<title>文件上传</title>
    </head>
    <body>
    	<form action="uploadHelperTest.php" method="post" enctype="multipart/form-data">
    		上传：
    		<input type="file" name="myFile" /><br/>
    		<input type="submit" value="上传">
    	</form>
    </body>
    </html>

<?php 
    	header('content-type:text/html; charset=utf-8');
    	require_once 'UploadHelper.class.php';
    
    	$uploadHelper = new UploadHelper('./test', false);
    	$destination = $uploadHelper->uploadFile();
    	if (!($destination === false)) {
    		echo "$destination";
    	}
    	echo $uploadHelper->getError();
     ?>