You can--you need to check the signature of the visiting client and
determine whether it is a spider (for example, Google indexers are called
"googlebot"s). This is in $_SERVER['HTTP_USER_AGENT']. Here's a thread on
the subject:
http://news.php.net/php.general/217460
You can also use the browscap
hello group,
is it possible to make write a program in php ,so that only search bots can
see the output of that program.i mean to say that a program echoes a line at
the footer which only search bots can see,it will be invisible to general
visitors.
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