php屏蔽恶意攻击php屏蔽恶意蜘蛛

php判断ua是否是恶意攻击恶意蜘蛛进行屏蔽
`$ua = $_SERVER[‘HTTP_USER_AGENT’];
function checkrobot($useragent=’’){
static $kw_spiders = array(‘bot’, ‘crawl’, ‘spider’ ,’slurp’, ‘sohu-search’,’Messenger’,’Micro’, ‘lycos’, ‘robozilla’);
static $kw_browsers = array(‘msie’, ‘netscape’, ‘opera’, ‘konqueror’, ‘mozilla’);

    $useragent = strtolower(empty($useragent) ? $_SERVER['HTTP_USER_AGENT'] : $useragent);
    if(strpos($useragent, 'http://') === false && dstrpos($useragent, $kw_browsers)) return false;
    if(dstrpos($useragent, $kw_spiders)) return true;
    return false;

}
function dstrpos($string, $arr, $returnvalue = false) {
if(empty($string)) return false;
foreach((array)$arr as $v) {
if(strpos($string, $v) !== false) {
$return = $returnvalue ? $v : true;
return $return;
}
}
return false;
}`

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