Learn about PHP file uploading

The following article will introduce you to the relevant knowledge of PHP file upload. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

1. Types of file uploads

1. Picture files image/gif image/jpg image/jpeg iamge/png image /x-png

2. PHP can upload multiple types of files, such as word, text files, Excel files, PPT files, binary files, PDF files, video and audio files

2. Form characteristics

1. The enctype attribute must be multipart/form-data to indicate uploading binary data

2. The type attribute of the input tag is file

	<form action="test.php" enctype="multipart/form-data" method="post">
		<input type="file" name="file">
		<input type="submit" value="上传">
	</form>	

3. Global variable $_FILES

1. Introduction: It is a two-dimensional data used to receive information about uploaded files

2.$_FILES[][ 'name'] stores the name of the file in the client file system

3, $_FILES[]['type'] stores the type of the file passed by the client

4, $_FILES[] ['size'] stores the byte size of the file

5, $_FILES[]['tmp_name'] stores the temporary full path of the file stored on the server after it is uploaded

6,$_FILES []['error'] Stores the error code of file upload

• 0 means no error occurred

• 1 The size of the uploaded file exceeds PHP The configured agreed value

• 2 The size of the uploaded file exceeds the HTML configured agreed value

• 3 Indicates that the file is partially uploaded

• 4 means no files have been uploaded

	//获得上传文件名字
	echo $_FILES['file']['name'];//输出 1.jpg
	echo &#39;<br>&#39;;

	//获得上传文件类型
	echo $_FILES[&#39;file&#39;][&#39;type&#39;];//输出 image/jpeg
	echo &#39;<br>&#39;;

	//获得上传文件大小,以字节为单位
	echo $_FILES[&#39;file&#39;][&#39;size&#39;];//输出 31019
	echo &#39;<br>&#39;;

	//获得临时文件的路径
	echo $_FILES[&#39;file&#39;][&#39;tmp_name&#39;];//输出 G:\xampp\tmp\phpED8A.tmp
	echo &#39;<br>&#39;;

	//获得文件上传的错误代码,不同的错误代码对应不同的错误
	echo $_FILES[&#39;file&#39;][&#39;error&#39;];//输出 0
	echo &#39;<br>&#39;;

4. File upload

move_uploaded_file()

Copy the uploaded files stored in the temporary directory to a new location

	//判断是否上传成功
	if(!$_FILES['file']['error']){

		//判断是否有uploads目录，没有则创建这个目录
		if(!is_dir('uploads')){
			mkdir('uploads');
		}

		//获取文件名，创建文件放置的位置
		$filepath = 'uploads/'.$_FILES['file']['name'];

		//将临时文件移动到指定位置
		move_uploaded_file( $_FILES['file']['tmp_name'],$filepath);

		//移动成功后，可以在uploads目录中看到上传的文件
	}

Recommended learning: PHP video tutorial

The above is the detailed content of Learn about PHP file uploading. For more information, please follow other related articles on the PHP Chinese website!