PHP 手冊
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# is_dir

(PHP 3, PHP 4 , PHP 5)

is_dir -- Tells whether the filename is a directory

## Description

bool is_dir ( string filename)

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.

> 備注:此函數的結果會被快取。詳細資訊請參考 clearstatcache()。

示範 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:
    bool(false)
    bool(false)
    bool(true)

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

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

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