Problem with in_array function

Hi all i have problem with in_array() function to comparing string of filepath. I read from a directory and write the filepath into database if the flag is off. If the file is modified i update the last time of modify and if there are new file i add this file into Db. i have write a function to explain the problem to this link: http://www.fadelabor.net/update.php Thanks so much to all.