How to check if directory contents has changed with PHP?

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As already mentioned by others, a better way to solve this would be to trigger a function when particular events happen, that changes the folder.
However, if your server is a unix, you can use inotifywait to watch the directory, and then invoke a PHP script.

Here’s a simple example:

#!/bin/sh
inotifywait --recursive --monitor --quiet --event modify,create,delete,move --format '%f' /path/to/directory/to/watch |
  while read FILE ; do
    php /path/to/trigger.php $FILE
  done

See also: http://linux.die.net/man/1/inotifywait

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