PHP file operation example: file details

With the continuous development of the Internet, PHP has become one of the most widely used languages. In PHP, file operations are one of the very common operations. This article will introduce some examples for file operations and explain in detail how to obtain file details.

In PHP, we can use a series of functions to perform file operations. Below, we will introduce several common file operation functions:

1. fopen(): used to open a file and receives two parameters. The first parameter is used to specify the file name, and the second parameter is used to specify the file name. Parameters are used to specify the operation mode.
2. fread(): Used to read an open file, receiving two parameters. The first parameter specifies the open file handle, and the second parameter specifies the read length.
3. fwrite(): Used to write content to an open file. It receives three parameters. The first parameter specifies the open file handle, the second parameter specifies the content to be written to the file, and the third parameter The parameter specifies the length to be written.
4. fclose(): used to close an open file and receives one parameter, which is the open file handle.

We can use the above function to get the details of a file. Below, we will explain in detail how to obtain file details.

Get the file name, path and file type

To get the file information, we first need to open the file to get the information, and then use the built-in function that comes with PHP to get the file name, path and file type. The code is as follows:

$file = 'example.txt';
$info = pathinfo($file);
echo $info['filename'];  // 输出文件名
echo $info['dirname'];  // 输出路径名
echo $info['extension'];  // 输出文件扩展名

In the above code, we use the pathinfo() function to obtain the file name, path and file type information. This function returns an array containing information such as file name, path, and file type. In the above code, we only output the file name, path and file type. In fact, this function can also return information such as file size, creation time, etc.

Get the file size, creation time and modification time

To get the file size, creation time and modification time, we can use the PHP built-in functions filesize(), filectime() and filemtime() . The code is as follows:

$file = 'example.txt';
echo '文件大小：'.filesize($file).' bytes'."
";  // 输出文件大小
echo '创建时间：'.date("Y-m-d H:i:s",filectime($file))."
";  // 输出文件创建时间
echo '修改时间：'.date("Y-m-d H:i:s",filemtime($file))."
";  // 输出文件修改时间

In the above code, we use the filesize() function to get the file size, the filectime() function to get the creation time, and the filemtime() function to get the modification time. It should be noted that the timestamps returned by these functions need to be converted into a time format we can understand through the date() function.

Get file contents

To get the file contents, we can use the PHP built-in function file_get_contents(). The code is as follows:

$file = 'example.txt';
$content = file_get_contents($file);
echo $content;

In the above code, we use the file_get_contents() function to obtain the contents of the file. This function returns the content string of the file. We can use the echo statement to output the string.

Through the above code, we can easily obtain the details of a file. This is very useful for daily development work, especially file upload, download and other operations. Using the above method, we can obtain information such as file size, creation time, modification time, and file content. This information can help us better understand the files, and it can also help us better manage the files.

Summary

In this article, we introduced how to get the details of a file using PHP built-in functions. Through the above code, we can easily obtain information such as file name, path, size, creation time, modification time, and content. This information can help us better manage files and also improve our development efficiency. Of course, in actual use, we can also make appropriate adjustments according to our own needs to meet actual needs.

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