PHP function introduction—pathinfo(): returns file information in the path

PHP function introduction—pathinfo(): Returns file information in the path

In the process of web development, we often need to operate files, such as obtaining file information, file paths, etc. PHP provides many functions to handle these needs. Among them, the pathinfo() function is very useful, it can easily extract file-related information from a file path.

The basic syntax of the pathinfo() function is as follows:

pathinfo($path, $options);

$path is the file path, $options are optional parameters, used to control the output results. This function returns an array containing various information in the file path. Next, let’s look at a few commonly used options.

1. PATHINFO_DIRNAME: Get the directory part of the path
2. PATHINFO_BASENAME: Get the file name part of the path
3. PATHINFO_EXTENSION: Get the file extension part of the path
4. PATHINFO_FILENAME: Get the file name (excluding extension) part of the path

The following are some code examples to show the use of the pathinfo() function:

// 获取路径的目录部分
$path = "/home/user/www/example.php";
$dirname = pathinfo($path, PATHINFO_DIRNAME);
echo "目录：".$dirname."
";

// 获取路径的文件名部分
$basename = pathinfo($path, PATHINFO_BASENAME);
echo "文件名：".$basename."
";

// 获取路径的文件扩展名部分
$extension = pathinfo($path, PATHINFO_EXTENSION);
echo "扩展名：".$extension."
";

// 获取文件名（不包含扩展名）部分
$filename = pathinfo($path, PATHINFO_FILENAME);
echo "文件名（不包含扩展名）：".$filename."
";

Running the above code, you will get the following results:

目录：/home/user/www
文件名：example.php
扩展名：php
文件名（不包含扩展名）：example

Through the pathinfo() function, we can easily get each part of the path. This is often used in development, especially in file uploading and processing. We can easily obtain the directory, file name, extension and other information of the file for further operations.

Summary:

• The pathinfo() function is a very convenient function in PHP. It can easily extract various information about the file from the file path.
• PATHINFO_DIRNAME is used to get the directory part of the path.
• PATHINFO_BASENAME is used to get the file name part of the path.
• PATHINFO_EXTENSION is used to get the file extension part of the path.
• PATHINFO_FILENAME is used to get the file name (excluding extension) part of the path.

I hope this article can help everyone better understand and use the pathinfo() function and bring convenience to development work.

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