PHP 手冊
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# is_file

(PHP 3, PHP 4 , PHP 5)

is_file -- Tells whether the filename is a regular file

## Description

bool is_file ( string filename )

Returns `TRUE` if the filename exists and is a regular file.

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

> 提示: 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 is_dir() and is_link().

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