PHP has a great function to help you capture only the files you need. Its called
glob - Find pathnames matching a pattern
Returns an array containing the matched files/directories, an empty array if no file matched or FALSE on error.
Here is an example usage -
$files = glob("/path/to/folder/*.txt");
This will populate the
$files variable with a list of all files matching the
*.txt pattern in the given path.
If you want more than one extension searched, then
preg_grep() is an alternative for filtering:
$files = preg_grep('~\.(jpeg|jpg|png)$~', scandir($dir_f));
glob has a similar extra syntax. This mostly makes sense if you have further conditions, add the
~i flag for case-insensitive, or can filter combined lists.