Mixing $_GET[''] with a string? [closed]

Mixing $_GET[''] with a string? [closed]

References

Reference NO 1

http://stackoverflow.com/questions/15189602/mixing-get-with-a-string

Reference NO 2

https://github.com/phalcon/docs/blob/master/en/api/Phalcon_Http_Request.rst

Reference NO 3

http://php.net/manual/en/function.isset.php

Reference NO 4

http://php.net/manual/en/function.filter-input.php

Reference NO 5

http://www.sitepoint.com/on-get-and-post/

Reference NO 6

http://xref.dokuwiki.org/reference/dokuwiki/inc/Input.class.php.html

Reference NO 7

http://www.astro.ufl.edu/~warner/prog/php.html

Reference NO 8

http://razzed.com/2009/01/14/top-5-most-useful-non-native-php-functions/