function check_content($filename,$disallowed_content)
    {
        $disallowed_content = explode(\'|\', $disallowed_content);
        $fp = @fopen($filename, \'rb\');
        if ($fp !== false)
        {
            $ie_mime_relevant = fread($fp, 256);
            fclose($fp);
            foreach ($disallowed_content as $forbidden)
            {
                if (stripos($ie_mime_relevant, \'<\' . $forbidden) !== false)
                {
                    return false;
                }
            }
        }
        return true;
    }

$disallowed = \'body|head|html|pre|script|table|title\';
    if(check_content(\'/path/to/file.php\',$disallowed)){
        
    }