PHP is_dir() Function: Description, Parameters, Return Values, and Usage Examples

The PHP is_dir() function determines whether a given filename refers to an existing directory.

Signature: bool is_dir(string $filename) Parameters: $filename – the path to check; if it exists and is a directory, the function returns true, otherwise false. Relative paths are resolved against the current working directory.

Return value: true if the path is a directory, false otherwise.

Example 1:

<?php
var_dump(is_dir('a_file.txt'));
var_dump(is_dir('bogus_dir/abc'));
var_dump(is_dir('..'));
?>

Output:

bool(false)
bool(false)
bool(true)

Example 2:

<?php
$file = "images";
if (is_dir($file)) {
    echo "$file is a directory";
} else {
    echo "$file is not a directory";
}
?>

This will echo whether images is a directory.