Log File

I ended up going through your code and have worked out what is wrong. In resmushit.inc.php the following returns FALSE if the file does not exist.

if( !is_writable(ABSPATH . RESMUSHIT_LOGS_PATH) ) {
	return FALSE;
}

As soon as I went and created it, it immediately started writing to it 🙂

That check should actually be:

if( !is_writable(ABSPATH) ) {
	// Do Something Here to Inform User
	return FALSE;
}

Then extend the code that follows it with an else, and cater for the scenario of a file not existing:

if(file_exists(ABSPATH . RESMUSHIT_LOGS_PATH)){
	if(filesize(ABSPATH . RESMUSHIT_LOGS_PATH) > RESMUSHIT_LOGS_MAX_FILESIZE) {
		$logtailed = logtail(ABSPATH . RESMUSHIT_LOGS_PATH, 20);
		$fp = fopen(ABSPATH . RESMUSHIT_LOGS_PATH, 'w');
		fwrite($fp, $logtailed);
		fclose($fp);
	}
} else {
	// Create New File
	// Do Whatever Else
}