fileatime

(PHP 4, PHP 5)

fileatime — Gets last access time of file

설명

int fileatime ( string $filename )

Gets the last access time of the given file.

인수

filename: Path to the file.

반환값

Returns the time the file was last accessed, or FALSE on failure. The time is returned as a Unix timestamp.

예제

Example #1 fileatime() example


<?php

// outputs e.g.  somefile.txt was last accessed: December 29 2002 22:16:23.

$filename = 'somefile.txt';
if (file_exists($filename)) {
    echo "$filename was last accessed: " . date("F d Y H:i:s.", fileatime($filename));
}

?>

오류/예외

Upon failure, an E_WARNING is emitted.

주의

Note:
The atime of a file is supposed to change whenever the data blocks of a file are being read. This can be costly performance-wise when an application regularly accesses a very large number of files or directories.

Some Unix filesystems can be mounted with atime updates disabled to increase the performance of such applications; USENET news spools are a common example. On such filesystems this function will be useless.

Note:
시간 정밀도는 각각 파일 시스템에 따라 다를 수 있습니다.

Note: 이 함수의 결과는 캐시에 저장합니다. 자세한 설명은 clearstatcache()를 참고하십시오.

Tip

PHP 5.0.0부터 이 함수는 몇몇 URL 래퍼를 사용할 수 있습니다. 기능적으로 stat() 패밀리를 지원하는 래퍼 목록은 Supported Protocols and Wrappers를 참고하십시오.

참고

filemtime() - Gets file modification time
fileinode() - Gets file inode
date() - 로컬 날짜/시간을 형식화합니다

add a note User Contributed Notes fileatime - [2 notes]

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-1

Tyler at visualbits dot net ¶

4 years ago


This only applys to the FAT filesystem, ntfs and greater have file access time support.



Be careful with this function it can degrade script performance if checking several files.

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-1

Maulwurf ¶

8 years ago


Using this function on Win98 made me grow grey hair.

Win 98 doesn't save the time for the last access. It only saves the date. This way, the returned timestamp from fileatime(file) is always much too small.



this command will always return false:



if($now - $last_access >1800) {

do something

}



using filemtime() instead did the thing.

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