This addon just base on the keywords list which define in the plugin, so it may lead to wrong detection too. Just look in the code you will the all the list, such as:
Quote:
"c99shell.php', 'shell.php', 'cmd.php','r57.php?phpinfo', 'r57.php?phpini', 'r57.php?cpu', 'r57.php?'
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So if you have your php code file name as these above list then you could not run

. Any if a hacker read this, they 'll modified their backdoor to another filename such as "a.php" then this script is .. useless.