How does php determine whether it is a directory or a file?

In PHP, you can use the is_dir() and is_file() functions to determine whether it is a directory or a file. The is_dir() function can determine whether it is a directory. If it is a directory, it returns true. The is_file() function can determine whether it is a file. If it is a regular file, it returns true.

PHP is_dir() function

is_dir() function checks whether the specified file is a directory. If the directory exists, this function returns TRUE. [Related tutorial recommendations: "PHP Tutorial"]

Note: The results of this function will be cached. Please use clearstatcache() to clear the cache.

Example:

<?php
$file = "images";
if(is_dir($file))
{
echo ("$file是一个目录");
}
else
{
echo ("$file不是一个目录");
}
?>

Output:

images是一个目录

PHP is_file() function

is_file() function checks the specification Whether the file is a regular file. If the file is a regular file, this function returns TRUE.

Example:

<?php
$file = "test.txt";
if(is_file($file))
{
echo ("$file是常规文件");
}
else
{
echo ("$file不是常规文件");
}
?>

Output:

test.txt是常规文件

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