Hide content from web crawlers with php. Is it possible?

Hide content from web crawlers with php. Is it possible?

References

Reference NO 1

http://stackoverflow.com/questions/15187299/hide-content-from-web-crawlers-with-php-is-it-possible

Reference NO 2

http://stackoverflow.com/questions/13249754/web-crawler-fetch-only-useful-html-content-to-speed-up-fetching-in-php

Reference NO 3

http://stackoverflow.com/questions/8404775/how-to-identify-web-crawler

Reference NO 4

http://stackoverflow.com/questions/13282492/block-automatic-web-content-collector-crawler

Reference NO 5

http://stackoverflow.com/questions/3341620/php-based-web-crawler-or-java-based-web-crawler

Reference NO 6

http://en.wikipedia.org/wiki/Web_crawler

Reference NO 7

#EANF#

Reference NO 8

#EANF#