PHP single file upload principle and upload function encapsulation_PHP tutorial

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Release: 2016-07-13 09:54:52
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PHP single file upload principle and packaging of upload function

<!--?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)&mdash;&mdash;>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(&#39;Content-Type:text/html;charset=utf-8&#39;);
//通过$_FILES接收上传文件的信息
$fileInfo = $_FILES[&#39;myFile&#39;];
function uploadFile($fileInfo,$uploadPath=&#39;uploads&#39;,$flag=true,$allowExt=array(&#39;jpeg&#39;,&#39;jpg&#39;,&#39;png&#39;,&#39;gif&#39;),$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($fileInfo[&#39;error&#39;]>0){
		//注意!错误信息没有5
		switch($fileInfo[&#39;error&#39;]){
			case 1:
				$mes= &#39;上传文件超过了PHP配置文件中upload_max_filesize选项的值&#39;;
				break;
			case 2:
				$mes= &#39;超过了HTML表单MAX_FILE_SIZE限制的大小&#39;;
				break;
			case 3:
				$mes= &#39;文件部分被上传&#39;;
				break;
			case 4:
				$mes= &#39;没有选择上传文件&#39;;
				break;
			case 6:
				$mes= &#39;没有找到临时目录&#39;;
				break;
			case 7:
				$mes= &#39;文件写入失败&#39;;
				break;
			case 8:
				$mes= &#39;上传的文件被PHP扩展程序中断&#39;;
				break;
				
		}	
		exit($mes);
	}
	$ext=pathinfo($fileInfo[&#39;name&#39;],PATHINFO_EXTENSION);
	//$allowExt=array(&#39;jpeg&#39;,&#39;jpg&#39;,&#39;png&#39;,&#39;gif&#39;);
	
	//检测上传文件的类型
	if(in_array($ext,$allowExt)){
		exit(&#39;非法文件类型&#39;);	
	}
	
	//检测上传文的件大小是否符合规范
	//$maxSize = 2097152;//2M
	if($fileInfo[&#39;size&#39;]>$maxSize){
		exit(&#39;上传文件过大&#39;);	
	}
	
	//检测图片是否为真实的图片类型
	//$flag=true;
	if($flag){
		if(!getimagesize($fileInfo[&#39;tmp_name&#39;])){
			exit(&#39;不是真实的图片类型&#39;);	
		}	
	}
	
	//检测是否是通过HTTP POST方式上传上来
	if(!is_uploaded_file($fileInfo[&#39;tmp_name&#39;])){
		exit(&#39;文件不是通过HTTP POST方式上传上来的&#39;);	
	}
	
	//$uploadPath=&#39;uploads&#39;;
	//如果没有这个文件夹,那么就创建一个
	if(!file_exists($uploadPath)){
		mkdir( $uploadPath, 0777, true);
		chmod( $uploadPath, 0777 );
	}
	//新文件名唯一
	$uniName = md5 ( uniqid( microtime(true),true) ).&#39;.&#39;.$ext;
	$destination = $uploadPath.&#39;/&#39;.$uniName;
	//@符号是为了不让客户看到错误信息
	if(! @move_uploaded_file($fileInfo[&#39;tmp_name&#39;], $destination )){
		exit(&#39;文件移动失败&#39;);	
	}
	
	//echo &#39;文件上传成功&#39;;
	//return array(
	//	&#39;newName&#39;=>$destination,
	//	&#39;size&#39;=>$fileInfo[&#39;size&#39;],
	//	&#39;type&#39;=>$fileInfo[&#39;type&#39;]
	//);
	return $destination;
}
?>
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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/995650.htmlTechArticlePHP single file upload principle and the encapsulation server (temporary file) of the upload function specifies the directory. When the file enters the server, it It is a temporary file. In this case, the name of the temporary file must be used during the operation...
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