expect_popen
I make a VERY simple class that monitors a folder (and its subfolders) for new or removed files. I use it in order to auto index a folder where I have all my eBooks into a MySQL database.
CLASS FILE:
<?php
class FileAlterationMonitor
{
private $scanFolder, $initialFoundFiles;
public function __construct($scanFolder)
{
$this->scanFolder = $scanFolder;
$this->updateMonitor();
}
private function _arrayValuesRecursive($array)
{
$arrayValues = array();
foreach ($array as $value)
{
if (is_scalar($value) OR is_resource($value))
{
$arrayValues[] = $value;
}
elseif (is_array($value))
{
$arrayValues = array_merge( $arrayValues, $this->_arrayValuesRecursive($value));
}
}
return $arrayValues;
}
private function _scanDirRecursive($directory)
{
$folderContents = array();
$directory = realpath($directory).DIRECTORY_SEPARATOR;
foreach (scandir($directory) as $folderItem)
{
if ($folderItem != "." AND $folderItem != "..")
{
if (is_dir($directory.$folderItem.DIRECTORY_SEPARATOR))
{
$folderContents[$folderItem] = $this->_scanDirRecursive( $directory.$folderItem."\\");
}
else
{
$folderContents[] = $folderItem;
}
}
}
return $folderContents;
}
public function getNewFiles()
{
$finalFoundFiles = $this->_arrayValuesRecursive( $this->_scanDirRecursive($this->scanFolder));
if ($this->initialFoundFiles != $finalFoundFiles)
{
$newFiles = array_diff($finalFoundFiles, $this->initialFoundFiles);
return empty($newFiles) ? FALSE : $newFiles;
}
}
public function getRemovedFiles()
{
$finalFoundFiles = $this->_arrayValuesRecursive( $this->_scanDirRecursive($this->scanFolder));
if ($this->initialFoundFiles != $finalFoundFiles)
{
$removedFiles = array_diff( $this->initialFoundFiles, $finalFoundFiles);
return empty($removedFiles) ? FALSE : $removedFiles;
}
}
public function updateMonitor()
{
$this->initialFoundFiles = $this->_arrayValuesRecursive($this->_scanDirRecursive( $this->scanFolder));
}
}
?>
A simple script that uses this class could be like this one (use it with PHP CLI):
<?php
$f = new FileAlterationMonitor($MY_FOLDER_TO_MONITOR)
while (TRUE)
{
sleep(1);
if ($newFiles = $f->getNewFiles())
{
// Code to handle new files
// $newFiles is an array that contains added files
}
if ($removedFiles = $f->getRemovedFiles())
{
// Code to handle removed files
// $newFiles is an array that contains removed files
}
$f->updateMonitor();
}
File Alteration Monitor Functions
簡介
FAM monitors files and directories, notifying interested applications of changes. More information about FAM is available at » http://oss.sgi.com/projects/fam/.
A PHP script may specify a list of files for FAM to monitor using the functions provided by this extension.
The FAM process is started when the first connection from any application to it is opened. It exits after all connections to it have been closed.
Note: 本擴充功能已被移動到 » PECL 函式庫中且自以下版本起不再被包含到 PHP 中：5.1.0.
Note: 本擴充功能在 Windows 平台下不可用。
需求
This extension uses the functions of the » FAM library, developed by SGI. Therefore you have to download and install the FAM library.
安裝
To use PHP's FAM support you must compile PHP --with-fam[=DIR] where DIR is the location of the directory containing the lib and include directories.
執行時期設定
本擴充功能在 php.ini 中未定義任何設定選項。
資源類型
There are two resource types used in the FAM module. The first one is the connection to the FAM service returned by fam_open(), the second a monitoring resource returned by the fam_monitor_XXX functions.
預設常數
以下常數由擴充功能定義，因此只有在擴充功能被編譯到 PHP 中，或者在執行時被動態載入後才有效。
| Constant | Description |
|---|---|
| FAMChanged (integer) | Some value which can be obtained with fstat(1) changed for a file or directory. |
| FAMDeleted (integer) | A file or directory was deleted or renamed. |
| FAMStartExecuting (integer) | An executable file started executing. |
| FAMStopExecuting (integer) | An executable file that was running finished. |
| FAMCreated (integer) | A file was created in a directory. |
| FAMMoved (integer) | This event never occurs. |
| FAMAcknowledge (integer) | An event in response to fam_cancel_monitor(). |
| FAMExists (integer) | An event upon request to monitor a file or directory. When a directory is monitored, an event for that directory and every file contained in that directory is issued. |
| FAMEndExist (integer) | Event after the last FAMEExists event. |
Table of Contents
- fam_cancel_monitor — Terminate monitoring
- fam_close — Close FAM connection
- fam_monitor_collection — Monitor a collection of files in a directory for changes
- fam_monitor_directory — Monitor a directory for changes
- fam_monitor_file — Monitor a regular file for changes
- fam_next_event — Get next pending FAM event
- fam_open — Open connection to FAM daemon
- fam_pending — Check for pending FAM events
- fam_resume_monitor — Resume suspended monitoring
- fam_suspend_monitor — Temporarily suspend monitoring
add a note
User Contributed Notesfam
Yassin Ezbakhe <yassin88 at gmail dot com>
01-Sep-2005 07:16
01-Sep-2005 07:16
ca50015 at yahoo dot com
28-Nov-2004 01:17
28-Nov-2004 01:17
if u want do recursive monitoring on directory tree,
dont use fam_monitor_directory()
try to use fam_monitor_collection() instead
:)
b e n a d l e r -at- g m x -d-o-t- net
12-Aug-2004 01:57
12-Aug-2004 01:57
in the example above, I would not use the while(1) and sleep() functions, since then you're back at waiting and polling for file changes, which you were trying to avoid using fam.
Instead, you can use while(fam_next_event($resource)), which blocks until there is an event. No polling, no useless wasting of cpu cycles.
Anyway, I have some problems with fam: It is very limited and almost useless.
- You cannot monitor a directory tree easily, since fam_monitor_directory() is non-recursive. Its an ugly hack, but you can go through each subdir and also monitor it with fam_monitor_directory().
- When you do that, you will have another problem: The events you get contain the code and the filename, but not the pathname of the file that caused the event. Thus, if you monitor two or more directories, and they possibly contain files with the same basename, you cannot find out what file has changed. One ugly solution might be to create a new fam_resource for each directory you want to monitor, but then you cannot use fam_next_event() in your while loop anymore.
- When a big file is saved (i.e. with photoshop via samba), you get file_changed events pretty much every second the file is being written to. It is not possible to receive ONE event AFTER the file operation is done.
I'm not sure, but I think most of this is not PHPs fault. Its just that fam (or dnotify, which fam uses on linux) sucks very badly. If you search on google, it seems everyone hates fam/dnotify (even linus), but noone has done anything about it yet.
If you find out how to work around thing, or if I'm completely wrong about all of this, please post here! Thanks!
sergiopaternoster at no_spam_tiscali dot it
22-May-2004 12:20
22-May-2004 12:20
Here is a simple script to check changes etc. to a file.
<?php
/* opens a connection to the FAM service daemon */
$fam_res = fam_open ();
/*
* The second argument is the full pathname
* of the file to monitor.
* Note that you can't use relative pathnames.
*/
$nres = fam_monitor_file ( $fam_res, '/home/sergio/test/fam/file_to_monitor.log');
while(1){
if( fam_pending ( $fam_res ) ) $arr = (fam_next_event($fam_res)) ;
switch ($arr['code']){
case 1:
echo "FAMChanged\n";
break;
case 2:
echo "FAMDeleted\n";
break;
case 3:
echo "FAMStartExecuting\n";
break;
case 4:
echo "FAMStopExecuting\n";
break;
case 5:
echo "FAMCreated\n";
break;
case 6:
echo "FAMMoved\n";
break;
case 7:
echo "FAMAcknowledge\n";
break;
case 8:
echo "FAMExists\n";
break;
case 9:
echo "FAMEndExist\n";
break;
default:
break;
}
if(isset($arr)) unset($arr);
/* In order to avoid too much CPU load */
usleep(5000);
}
/* Close FAM connection */
fam_close($fam_res);
?>
Hope this could help.
God Belss PHP!
regards
Sergio Paternoster