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PHP单文件上传原理及上传函数的打包

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Release: 2016-06-13 12:19:08
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PHP单文件上传原理及上传函数的封装

<?php //单文件上传函数的封装//文件上传原理:将客户端的文件上传到服务器端,再将服务器端的临时文件移动到指定目录即可。//文件的方向:客户端——>服务器(临时文件)——>指定目录,当文件进入服务器时它就是临时文件了,这时操作中要用临时文件的名称tmp_name。//在客户端设置上传文件的限制(文件类型和大小)是不安全的,因为客户能通过源代码修改限制,所以在服务端这里设置限制。//设置编码为UTF-8,以避免中文乱码 header('Content-Type:text/html;charset=utf-8');//通过$_FILES接收上传文件的信息$fileInfo = $_FILES['myFile'];function uploadFile($fileInfo,$uploadPath='uploads',$flag=true,$allowExt=array('jpeg','jpg','png','gif'),$maxSize = 2097152){//判断错误号,只有为0或者是UPLOAD_ERR_OK,没有错误发生,上传成功	if($fileInfo['error']>0){		//注意!错误信息没有5		switch($fileInfo['error']){			case 1:				$mes= '上传文件超过了PHP配置文件中upload_max_filesize选项的值';				break;			case 2:				$mes= '超过了HTML表单MAX_FILE_SIZE限制的大小';				break;			case 3:				$mes= '文件部分被上传';				break;			case 4:				$mes= '没有选择上传文件';				break;			case 6:				$mes= '没有找到临时目录';				break;			case 7:				$mes= '文件写入失败';				break;			case 8:				$mes= '上传的文件被PHP扩展程序中断';				break;						}			exit($mes);	}	$ext=pathinfo($fileInfo['name'],PATHINFO_EXTENSION);	//$allowExt=array('jpeg','jpg','png','gif');		//检测上传文件的类型	if(in_array($ext,$allowExt)){		exit('非法文件类型');		}		//检测上传文的件大小是否符合规范	//$maxSize = 2097152;//2M	if($fileInfo['size']>$maxSize){		exit('上传文件过大');		}		//检测图片是否为真实的图片类型	//$flag=true;	if($flag){		if(!getimagesize($fileInfo['tmp_name'])){			exit('不是真实的图片类型');			}		}		//检测是否是通过HTTP POST方式上传上来	if(!is_uploaded_file($fileInfo['tmp_name'])){		exit('文件不是通过HTTP POST方式上传上来的');		}		//$uploadPath='uploads';	//如果没有这个文件夹,那么就创建一个	if(!file_exists($uploadPath)){		mkdir( $uploadPath, 0777, true);		chmod( $uploadPath, 0777 );	}	//新文件名唯一	$uniName = md5 ( uniqid( microtime(true),true) ).'.'.$ext;	$destination = $uploadPath.'/'.$uniName;	[email protected]	if(! @move_uploaded_file($fileInfo['tmp_name'], $destination )){		exit('文件移动失败');		}		//echo '文件上传成功';	//return array(	//	'newName'=>$destination,	//	'size'=>$fileInfo['size'],	//	'type'=>$fileInfo['type']	//);	return $destination;}?>
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