(PHP 5, PHP 7, PHP 8)
DirectoryIterator::isDir — Determine if current DirectoryIterator item is a directory
Determines if the current DirectoryIterator item is a directory.
此函数没有参数。
   Returns true if it is a directory, otherwise false
  
示例 #1 DirectoryIterator::isDir() example
This example lists the directories within the directory of the current script.
<?php
$iterator = new DirectoryIterator(dirname(__FILE__));
foreach ($iterator as $fileinfo) {
    if ($fileinfo->isDir()) {
        echo $fileinfo->getFilename() . "\n";
    }
}
?>
以上例程的输出类似于:
. .. apples bananas pears