(PHP 5, PHP 7, PHP 8)
DirectoryIterator::isFile — Determine if current DirectoryIterator item is a regular file
Determines if the current DirectoryIterator item is a regular file.
此函数没有参数。
   Returns true if the file exists and is a regular file 
   (not a link or dir), 
   otherwise false
  
示例 #1 DirectoryIterator::isFile() example
This example will list all regular files in the directory containing the script.
<?php
$iterator = new DirectoryIterator(dirname(__FILE__));
foreach ($iterator as $fileinfo) {
    if ($fileinfo->isFile()) {
        echo $fileinfo->getFilename() . "\n";
    }
}
?>
以上例程的输出类似于:
apple.jpg banana.jpg example.php pears.jpg