PHP | is_dir( ) Function

The is_dir() function in PHP used to check whether the specified file is a directory or not. The name of the file is sent as a parameter to the is_dir() function and it returns True if the file is a directory else it returns False.

Syntax:

is_dir($file)

Parameters Used:
The is_dir() function in PHP accepts only one parameter.

• $file : It is a mandatory parameter which specifies the file.

Return Value:
It returns True if the file is a directory else it returns false.

Exceptions:

1. An E_WARNING is emitted on failure.
2. The result of this function are cached and therefore the clearstatcache() function is used to clear the cache.
3. is_dir() function returns false for non-existent files.

Below programs illustrate the is_dir() function.

Program 1

<?php
$myfile = "user/home/documents/gfg";

// checking whether a file is directory or not
if (is_dir($myfile))
    echo ("$myfile is a directory");
else
    echo ("$myfile is not a directory");
?>

Output:

user/home/documents/gfg is a directory

Program 2

<?php
$myfile = "https://www.geeksforgeeks.org";

// checking whether a file is directory or not
if (is_dir($myfile))
    echo ("$myfile is a directory");

else
    echo ("$myfile is not a directory");
?>

Output:

https://www.geeksforgeeks.org is not a directory

Reference:
http://php.net/manual/en/function.is-dir.php