php 在PHP中删除所有超过2天的文件的正确方法
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The correct way to delete all files older than 2 days in PHP
提问by user4951
Just curious
只是好奇
$files = glob(cacheme_directory()."*");
foreach($files as $file)
{
$filemtime=filemtime ($file);
if (time()-$filemtime>= 172800)
{
unlink($file);
}
}
I just want to make sure if the code is correct or not. Thanks.
我只想确定代码是否正确。谢谢。
回答by buschtoens
You should add an is_file()check, because PHP normally lists .and .., as well as sub-directories that could reside in the the directory you're checking.
您应该添加一个is_file()检查，因为 PHP 通常会列出.和..以及可能驻留在您正在检查的目录中的子目录。
Also, as this answer suggests, you should replace the pre-calculated seconds with a more expressive notation.
此外，正如这个答案所暗示的那样，您应该用更具表现力的符号替换预先计算的秒数。
<?php
$files = glob(cacheme_directory()."*");
$now = time();
foreach ($files as $file) {
if (is_file($file)) {
if ($now - filemtime($file) >= 60 * 60 * 24 * 2) { // 2 days
unlink($file);
}
}
}
?>
Alternatively you could also use the DirectoryIterator, as shown in this answer. In this simple case it doesn't really offer any advantages, but it would be OOP way.
或者，您也可以使用DirectoryIterator，如本答案所示。在这种简单的情况下，它并没有真正提供任何优势，但它会是 OOP 方式。
回答by Stefanie Janine St?lting
The easiest way is by using DirectoryIterator:
最简单的方法是使用DirectoryIterator：
<?php
if (file_exists($folderName)) {
foreach (new DirectoryIterator($folderName) as $fileInfo) {
if ($fileInfo->isDot()) {
continue;
}
if ($fileInfo->isFile() && time() - $fileInfo->getCTime() >= 2*24*60*60) {
unlink($fileInfo->getRealPath());
}
}
}
?>
回答by Maksim.T
Another simplier and more modern way, using FilesystemIterator.
另一种更简单、更现代的方法，使用FilesystemIterator。
I'm using 'logs' directory as an example.
我以“logs”目录为例。
$fileSystemIterator = new FilesystemIterator('logs');
$now = time();
foreach ($fileSystemIterator as $file) {
if ($now - $file->getCTime() >= 60 * 60 * 24 * 2) // 2 days
unlink('logs/'.$file->getFilename());
}
Main advantage is: DirectoryIterator returns virtual directories "." and ".." in a loop. But FilesystemIterator ignores them.
主要优点是：DirectoryIterator 返回虚拟目录“.”。和“..”在一个循环中。但是 FilesystemIterator 忽略了它们。
回答by Lachit
/* Delete Cache Files Here */
$dir = "cache/"; /** define the directory **/
/*** cycle through all files in the directory ***/
foreach (glob($dir."*") as $file) {
//foreach (glob($dir.'*.*') as $file){
/*** if file is 24 hours (86400 seconds) old then delete it ***/
if (filemtime($file) < time() - 172800) { // 2 days
unlink($file);
}
}
Hope it help you.
希望对你有帮助。
回答by Niet the Dark Absol
Looks correct to me. I'd just suggest you replace 172800with 2*24*60*60for clarity.
对我来说看起来是正确的。我只是建议你更换172800使用2*24*60*60的清晰度。
回答by John Carter
回答by user3657553
Here is an example of how to do it recursively.
这是一个如何递归执行的示例。
function remove_files_from_dir_older_than_x_seconds($dir,$seconds = 3600) {
$files = glob(rtrim($dir, '/')."/*");
$now = time();
foreach ($files as $file) {
if (is_file($file)) {
if ($now - filemtime($file) >= $seconds) {
echo "removed $file<br>".PHP_EOL;
unlink($file);
}
} else {
remove_files_from_dir_older_than_x_seconds($file,$seconds);
}
}
}
remove_files_from_dir_older_than_x_seconds(dirname(__file__).'/cache/', (60 * 60 * 24 * 1) ); // 1 day
回答by Leon
I reckon this is much tidier and easier to read and modify.
我认为这更整洁，更易于阅读和修改。
$expire = strtotime('-7 DAYS');
$files = glob($path . '/*');
foreach ($files as $file) {
// Skip anything that is not a file
if (!is_file($file)) {
continue;
}
// Skip any files that have not expired
if (filemtime($file) > $expire) {
continue;
}
unlink($file);
}
回答by Miguel
/** It deletes old files.
* @param string $dir Directory
* @param int $secs Files older than $secs seconds
* @param string $pattern Files matching $pattern
*/
function delete_oldfiles($dir,$secs,$pattern = "/*")
{
$now = time();
foreach(glob("$dir$pattern") as $f) {
if (is_file($f) && ($now - filemtime($f) > $secs)) unlink($f);
}
}
