PHP 手冊
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# is_readable

(PHP 3, PHP 4 , PHP 5)

is_readable -- Tells whether the filename is readable

## Description

bool is_readable ( string filename )

Returns `TRUE` if the filename exists and is readable.

Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody'). Safe mode limitations are not taken into account.

> 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_writable(), file_exists(), and fgets().

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