is_dir

Definition and usage

is_dir() function checks whether the specified file is a directory.

实例

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

输出：

images is a directory

grammar

 is_dir ( file )

illustrate

Returns true if the file name exists and is a directory. If the file is a relative path, check its relative path according to the current working directory.