How can PHP be used to check if a folder exists?
To check if a folder exists in PHP, you can use the `file_exists()` function with the path to the folder as the argument. This function will return true if the folder exists and false if it does not.
$folderPath = 'path/to/folder';
if (file_exists($folderPath) && is_dir($folderPath)) {
echo 'Folder exists.';
} else {
echo 'Folder does not exist.';
}