filemtime
(PHP 4, PHP 5)
filemtime — Gets file modification time
說明
int filemtime
( string $filename
)
This function returns the time when the data blocks of a file were being written to, that is, the time when the content of the file was changed.
參數
- filename
-
Path to the file.
Return值
Returns the time the file was last modified, or FALSE in case of an error. The time is returned as a Unix timestamp, which is suitable for the date() function.
範例
Example#1 filemtime() example
<?php
// outputs e.g. somefile.txt was last modified: December 29 2002 22:16:23.
$filename = 'somefile.txt';
if (file_exists($filename)) {
echo "$filename was last modified: " . date ("F d Y H:i:s.", filemtime($filename));
}
?>
註釋
Note: 本函式的結果會被存入緩衝區。詳情參見 clearstatcache()。
Tip
自 PHP 5.0.0 起本函式也可被某些 URL wrapper 使用。參考List of Supported Protocols/Wrappers 來看哪些 wrapper 支援 stat() 系列函式的功能。