I'm new to using OPcache on php 8 and I have some questions. So my folder structure looks like this:
https://i.stack.imgur.com/vb93u.png
Within each folder is the exact same thing, it's the structure of my website.
Why does OPcache generate multiple folders with the same content?
What is the best way to keep only the most recent folder and delete the others? Is there a check that can be done every so often or a setting that overwrites older files with new ones?
I'm fast approaching the file limit with my hosting and need to clear up some space.
I've read the docs but I don't have a lot of knowledge working with servers so any help is greatly appreciated!
Oh and these are the settings in my php.ini:
zend_extension=opcache.so;
opcache.enable=1;
opcache.memory_consumption=32;
opcache.interned_strings_buffer=8;
opcache.max_accelerated_files=3000;
opcache.revalidate_freq=180;
opcache.fast_shutdown=0;
opcache.enable_cli=0;
opcache.revalidate_path=0;
opcache.validate_timestamps=1;
opcache.max_file_size=0;
opcache.file_cache=/mywebsitepath/.opcache;
opcache.file_cache_only=1;
Just in case anyone else has the same problem, this is what I ended up doing. First I tried to use the Wordpress cron manager but I was having issues getting a simple function to work. Instead, in my hosting you can create a cron job and link it to a php file, so I went that route instead. Here's the contents of the cron-jobs.php file which I put in my OPcache folder. Basically it sorts the folders by date modified then deletes the old ones while keeping the fresh one. If anyone has suggestions for improvements, be my guest!
function opcache_clean($dir) {
$folders = array();
foreach (scandir($dir) as $file) {
//we only want the folders, not files
if ( strpos($file, '.') === false ) {
$folders[$file] = filemtime($dir . '/' . $file);
}
}
//only delete the old folders if there is more than one
if (count($folders) > 1) {
arsort($folders);
$folders = array_keys($folders);
//keep the first folder (most recent directory at index 0)
$deletions = array_slice($folders, 1);
foreach($deletions as $delete) {
echo "deleting $delete <br>";
system("rm -rf ".escapeshellarg($delete));
}
}
else {
echo "No folders to delete!";
}
}
//clean the current directory
opcache_clean ( dirname(__FILE__) );
Strange behaviour, exentially:
(the name of the folder depends on the date - the purpose is a hit counter of the website, broken down by day)
if (!is_dir($folder)) { // first access in the day
mkdir($folder);
}
Well: on the server in internet all works well.
But when i try in local, with the server simulator of Easy PHP, happens that:
(a) The first time, no problem. The folder doesn't exists and it is created.
(b) subsequently, for example to a page refresh, the program flow again goes in the IF (!!!) generating the error (at line of mkdir) of kind: "Warning: mkdir(): No such file or directory in [...]".
All parent part of the directory $folder exists.
Thanks
.
Try using a recursive directory creation function:
function mkdir_r($dirName, $rights = 0777)
{
$dirs = explode(DIRECTORY_SEPARATOR , $dirName);
$dir = '';
if (strpos($dirs[count($dirs) - 1], '.')) {
array_pop($dirs);
}
foreach ($dirs as $part) {
$dir .= $part . DIRECTORY_SEPARATOR ;
if (!is_dir($dir) && strlen($dir) > 0) {
mkdir($dir, $rights);
}
}
}
This way all directories up to the directry you wanted to create are created if they don't exist.
mkdir doesn't work recursively unfortunately.
If anyone faces the issue; Use the native clearstatcache() function after you delete the file.
I'm quoting the interesting part of the original documentation
You should also note that PHP doesn't cache information about non-existent files. So, if you call file_exists() on a file that doesn't exist, it will return false until you create the file. If you create the file, it will return true even if you then delete the file. However unlink() clears the cache automatically.
For further information here is the documentation page: https://www.php.net/manual/en/function.clearstatcache.php
When i am using scandir function i get different results on linux and windows.
Windows i see only folder name
Linux it does the job under
I run a check if WordPress files has been changed ?
function find_all_files($dir, $deep)
{
if(strpos($dir,"wp-content") == false){
$root = scandir($dir);
foreach($root as $value)
{
if($value === '.' || $value === '..') {continue;}
if(is_file("$dir/$value")) {
$tmpFile = "$dir/$value";
if(5000000>#filesize($tmpFile)){
$result[]="$tmpFile";
}
continue;
}
$tmp = "$dir/$value";
if(strpos($tmp,"wp-content") == false){
if($deep == true){
foreach(#$this->find_all_files("$dir/$value",true) as $value)
{
$tmpFile = $value;
if(5000000>#filesize($tmpFile)){
$result[]="$tmpFile";
}
}
}
}
}
//var_dump($result);
return $result;
}
}
I had a similar issue and it all came down to:
1) if you mean "running on windows" OS you need to include, and start from the drive directory (where server is installed) in $dir to scan.
2) Windows might be picky about separators, compare your $dir with Wordpress ABSPATH and try to use PHP constant DIRECTORY_SEPARATOR instead of your own '/' separators.
3) And I asume you working with paths, not urls (http://localhost/wordpress/...plugin/dir/). This is working for me on Windows 7, running Uniserver (LAMP):
$rootfolder = 'startfolder';
$dir = plugin_dir_path(dirname( __FILE__ )).DIRECTORY_SEPARATOR.$rootfolder;
$files = array_slice(scandir($dir), 2);
However, you need to cut down the path end begin in the install dir with ABSPATH or something. But I recommend to test where your filescript is, like plugins folder, to not consume a huge stall on errors while working with this kind of stuff.
Hint!
The PHP docs about scandir has a lot off contributed functions about reading, retriving, scanning functions and issues. Take a look at: http://php.net/manual/en/function.scandir.php
Important!
Do not start messing with windows folder access, and if you do, take a RAW copy of whole www directory first, otherwise exported Worpdress installs could get messy on a Apache server live.
Remember, did you manage to install a new plugin from the Wordpress
admin, you propably dont have a folder access issue.
Hop this helps!
I'm having a very weird issue with file_exists(). I'm using this function to check if 2 different files in the same folders do exist. I've double-checked, they BOTH do exist.
echo $relative . $url['path'] . '/' . $path['filename'] . '.jpg';
Result: ../../images/example/001-001.jpg
echo $relative . $url['path'] . '/' . $path['filename'] . '.' . $path['extension'];
Result: ../../images/example/001-001.PNG
Now let's use file_exists() on these:
var_dump(file_exists($relative . $url['path'] . '/' . $path['filename'] . '.jpg'));
Result: bool(false)
var_dump(file_exists($relative . $url['path'] . '/' . $path['filename'] . '.' . $path['extension']));
Result: bool(true)
I don't get it - both of these files do exist. I'm running Windows, so it's not related to a case-sensitive issue. Safe Mode is off.
What might be worth mentioning though is that the .png one is uploaded by a user via FTP, while the .jpg one is created using a script. But as far as I know, that shouldn't make a difference.
Any tips?
Thanks
file_exists() just doesn't work with HTTP addresses.
It only supports filesystem paths (and FTP, if you're using PHP5.)
Please note:
Works :
if (file_exists($_SERVER['DOCUMENT_ROOT']."/folder/test.txt")
echo "file exists";
Does not work:
if (file_exists("www.mysite.com/folder/test.txt")
echo "file exists";
Results of the file_exists() are cached, so try using clearstatcache(). If that not helped, recheck names - they might be similar, but not same.
I found that what works for me to check if a file exists (relative to the current php file it is being executed from) is this piece of code:
$filename = 'myfile.jpg';
$file_path_and_name = dirname(__FILE__) . DIRECTORY_SEPARATOR . "{$filename}";
if ( file_exists($file_path_and_name) ){
// file exists. Do some magic...
} else {
// file does not exists...
}
Just my $.02: I just had this problem and it was due to a space at the end of the file name. It's not always a path problem - although that is the first thing I check - always. I could cut and paste the file name into a shell window using the ls -l command and of course that locates the file because the command line will ignore the space where as file_exists does not. Very frustrating indeed and nearly impossible to locate were it not for StackOverflow.
HINT: When outputting debug statements enclose values with delimiters () or [] and that will show a space pretty clearly. And always remember to trim your input.
It's because of safe mode. You can turn it off or include the directory in safe_mode_include_dir. Or change file ownership / permissions for those files.
php.net: file_exists()
php.net: safe mode
Try using DIRECTORY_SEPARATOR instead of '/' as separator. Windows uses a different separator for file system paths (backslash) than Linux and Unix systems.
A very simple trick is here that worked for me.
When I write following line, than it returns false.
if(file_exists('/my-dreams-files/'.$_GET['article'].'.html'))
And when I write with removing URL starting slash, then it returns true.
if(file_exists('my-dreams-files/'.$_GET['article'].'.html'))
I have a new reason this happens - I am using PHP inside a Docker container with a mounted volume for the codebase which resides on my local host machine.
I was getting file_exists == FALSE (inside Composer autoload), but if I copied the filepath into terminal - it did exist! I tried the clearstatche(), checked safe-mode was OFF.
Then I remembered the Docker volume mapping: the absolute path on my local host machine certainly doesn't exist inside the Docker container - which is PHP's perspective on the world.
(I keep forgetting I'm using Docker, because I've made shell functions which wrap the docker run commands so nicely...)
It can also be a permission problem on one of the parent folders or the file itself.
Try to open a session as the user running your webserver and cd into it. The folder must be accessible by this user and the file must be readable.
If not, php will return that the file doesn't exist.
have you tried manual entry. also your two extensions seem to be in different case
var_dump(file_exists('../../images/example/001-001.jpg'));
var_dump(file_exists('../../images/example/001-001.PNG'));
A custom_file_exists() function inspired by #Timur, #Brian, #Doug and #Shahar previous answers:
function custom_file_exists($file_path=''){
$file_exists=false;
//clear cached results
//clearstatcache();
//trim path
$file_dir=trim(dirname($file_path));
//normalize path separator
$file_dir=str_replace('/',DIRECTORY_SEPARATOR,$file_dir).DIRECTORY_SEPARATOR;
//trim file name
$file_name=trim(basename($file_path));
//rebuild path
$file_path=$file_dir."{$file_name}";
//If you simply want to check that some file (not directory) exists,
//and concerned about performance, try is_file() instead.
//It seems like is_file() is almost 2x faster when a file exists
//and about the same when it doesn't.
$file_exists=is_file($file_path);
//$file_exists=file_exists($file_path);
return $file_exists;
}
This answer may be a bit hacky, but its been working for me -
$file = 'path/to/file.jpg';
$file = $_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['HTTP_HOST'].'/'.$file;
$file_headers = #get_headers($file);
if($file_headers[0] == 'HTTP/1.1 404 Not Found') {
$exists = false;
}else{
$exists = true;
}
apparently $_SERVER['REQUEST_SCHEME'] is a bit dicey to use with IIS 7.0 + PHP 5.3 so you could probably look for a better way to add in the protocol.
I found this answer here http://php.net/manual/en/function.file-exists.php#75064
I spent the last two hours wondering what was wrong with my if statement: file_exists($file) was returning false, however I could call include($file) with no problem.
It turns out that I didn't realize that the php include_path value I had set in the .htaccess file didn't carry over to file_exists, is_file, etc.
Thus:
<?PHP
// .htaccess php_value include_path '/home/user/public_html/';
// includes lies in /home/user/public_html/includes/
//doesn't work, file_exists returns false
if ( file_exists('includes/config.php') )
{
include('includes/config.php');
}
//does work, file_exists returns true
if ( file_exists('/home/user/public_html/includes/config.php') )
{
include('includes/config.php');
}
?>
Just goes to show that "shortcuts for simplicity" like setting the include_path in .htaccess can just cause more grief in the long run.
In my case, the problem was a misconception of how file_exists() behaves with symbolic links and .. ("dotdot" or double period) parent dir references. In that regard, it differs from functions like require, include or even mkdir().
Given this directory structure:
/home/me/work/example/
www/
/var/www/example.local/
tmp/
public_html -> /home/me/work/example/www/
file_exists('/var/www/example.local/public_html/../tmp/'); would return FALSE even though the subdir exists as we see, because the function traversed up into /home/me/work/example/ which does not have that subdir.
For this reason, I have created this function:
/**
* Resolve any ".." ("dotdots" or double periods) in a given path.
*
* This is especially useful for avoiding the confusing behavior `file_exists()`
* shows with symbolic links.
*
* #param string $path
*
* #return string
*/
function resolve_dotdots( string $path ) {
if (empty($path)) {
return $path;
}
$source = array_reverse(explode(DIRECTORY_SEPARATOR, $path));
$balance = 0;
$parts = array();
// going backwards through the path, keep track of the dotdots and "work
// them off" by skipping a part. Only take over the respective part if the
// balance is at zero.
foreach ($source as $part) {
if ($part === '..') {
$balance++;
} else if ($balance > 0) {
$balance--;
} else {
array_push($parts, $part);
}
}
// special case: path begins with too many dotdots, references "outside
// knowledge".
if ($balance > 0) {
for ($i = 0; $i < $balance; $i++) {
array_push($parts, '..');
}
}
$parts = array_reverse($parts);
return implode(DIRECTORY_SEPARATOR, $parts);
}
I just encountered this same problem and I solved it in a mysterious way. After inserting a a filepath I copied from Windows File explorer. file_exists() keeps returning false continuously, but if I copy same path from VSCode editor it works perfectly.
After dumping variables with var_dump($path); I noticed something mysterious.
For path I copied from file explorer it shows length 94.
For path I copied from VSCode Editor it shows length 88.
Both path look same length on my code Editor.
My suggestion: if string contain hidden characters, it may fail and not work.
I want to delete cache files in a directory, the directory can contain up to 50.000 files. I currently I use this function.
// Deletes all files in $type directory that start with $start
function clearCache($type,$start)
{
$open = opendir($GLOBALS['DOC_ROOT']."/cache/".$type."/");
while( ($file = readdir($open)) !== false )
{
if ( strpos($file, $start)!==false )
{
unlink($GLOBALS['DOC_ROOT']."/cache/".$type."/".$file);
}
}
closedir($open);
}
This works fine and it is fast, but is there any faster way to do this? (scan_dir seems to be slow). I can move the cache to memory obviously.
Thanks,
hamlet
You may want to take a look into the glob function, as it may be even faster... it depends on the C library's glob command to do its work.
I haven't tested this, but I think this would work::
foreach (glob($GLOBALS['DOC_ROOT']."/cache/".$type."/".$start) as $file) {
unlink($GLOBALS['DOC_ROOT']."/cache/".$type."/".$file);
}
Edit: I'm not sure if $file would be just the filename or the entire path. glob's documentation implies just the filename.
Either glob as suggested before or, if you can be certain there won't be malicious input, by issueing directly to the system via exec(sprintf('rm %s/sess*', realpath($path)));, which should be fastest.