PHP is_dir function

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is_dir

(PHP 3, PHP 4, PHP 5)

Returns TRUE if the filename exists and is a directory. If
filename is a relative filename, it will be
checked relative to the current working directory.

Note: The results of this
function are cached. See clearstatcache() for
more details.

Example 1. is_dir() example

var_dump(is_dir('a_file.txt')) . "\n";
var_dump(is_dir('bogus_dir/abc')) . "\n";
 
var_dump(is_dir('..')); //one dir up

The above example will output:

Tip: As of PHP 5.0.0 this function
can also be used with some URL wrappers. Refer to
Appendix N for a listing of which wrappers support
stat() family of functionality.

See also chdir(), dir,
opendir(), is_file() and
is_link().