How to quickly know the size, type and permissions of the file in php file operations

In the previous article "php file operation: how to obtain the time attribute (information) of the file", we learned that we can use the built-in functions filectime(), filemtime, fileatime() to obtain separate files Three time attributes: creation time, modification time and last access time. Interested friends can learn about it~

The main content of this article is to understand the file size, file type and file/directory permissions method of obtaining. Let’s give you a detailed introduction to how to obtain it.

1. Get the size of the file

You can use the filesize($filename) function to return the specified file$filename the size of. Returns the file size in bytes on success or FALSE on failure.

<?php
header("content-type:text/html;charset=utf-8");
$filename = "test.txt";
echo "{$filename} 文件的大小为：".filesize($filename);
?>

The output result is:

2. Get the file type

You can use filetype ($filename) The function returns the type of the specified file or directory $filename. If successful, one of the following 7 possible values ​​will be returned:

• fifo

• ##char

##dir
block
link
file
unknown
If failed, return FALSE.

<?php
header("content-type:text/html;charset=utf-8");
$filename = "D:/demo/text.txt";
echo "{$filename} 文件的类型为：".filetype($filename);

$filename = "D:/demo/1.jpg";
echo "<br>{$filename} 文件的类型为：".filetype($filename);

$filename = "D:/demo/img";
echo "<br>{$filename} 文件的类型为：".filetype($filename);

?>

The output result is:

3. Obtain file permissions

You can use

fileperms ($filename)

The function returns the permissions of the file or directory $filename. If successful, the permissions are returned as a number. On failure, returns FALSE.

<?php
header("content-type:text/html;charset=utf-8");
$filename = "test.txt";
echo "{$filename} 文件的权限为：".fileperms($filename);
?>

The output result is:

# Description: The number representing permissions has three possible values. To set multiple permissions, you can use the following numbers. Total:

1 = Execute permission
#2 = Write permission
4 = Read permission
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