is_file
(PHP 4, PHP 5)
is_file — Tells whether the filename is a regular file
Description
bool is_file
( string $filename
)
Tells whether the given file is a regular file.
Parameters
- filename
-
Path to the file.
Return Values
Returns TRUE if the filename exists and is a regular file, FALSE otherwise.
範例
Example#1 is_file() example
<?php
var_dump(is_file('a_file.txt')) . "\n";
var_dump(is_file('/usr/bin/')) . "\n";
?>
The above example will output:
bool(true) bool(false)
Notes
Note: 此函數的結果會被快取。詳細資訊請參考 clearstatcache()。
Tip
As of PHP 5.0.0 this function can also be used with some URL wrappers. Refer to List of Supported Protocols/Wrappers for a listing of which wrappers support stat() family of functionality.