PHP is_dir() Function: Determine if a Path is a Directory

The is_dir() function in PHP returns a boolean indicating whether the supplied filename corresponds to an existing directory.

Signature: bool is_dir(string $filename) Description: It checks the given path; if the filename exists and is a directory, it returns TRUE, otherwise FALSE. Relative paths are resolved against the current working directory.

Parameter: $filename – the path to test; can be absolute or relative.

Return value: TRUE if the path is a directory, FALSE otherwise.

Example:

<?php
var_dump(is_dir('a_file.txt'));
var_dump(is_dir('bogus_dir/abc'));
var_dump(is_dir('..'));
// one dir up
bool(false)
bool(false)
bool(true)