php - Toggle links for crawler and guest visitors -

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i need display 2 different links crawler , guest. example:
crawler see normal link - <a href="example.com">example.com</a>
guest see link - <a href="other.com/register">register see link</a>

// check user agent of current 'visitor' if($detect->iscrawler()) {     // true if crawler user agent detected }else{     // false }

for part, can determine if site being crawled looking @ 'user-agent' header:

function iswebcrawler() {   $iscrawler = false;    $useragent = $_server['http_user_agent'];   if(strlen(strstr($useragent, "google")) <= 0 ) {     $iscrawler = true;   }    return $iscrawler; }

here listing of user agent strings of major bots: list of web crawler user agents


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