php - GET - get the value and append to a link? -

i have query string in url:

?search=whatever

i need append paginated links:

example.com/articles/p3/?search=whatever

i can value using:

$_get['search'] //whatever

but what's best way build string can append url. there proper way or case of appending string:

'?search='.$_get['search']

for building url's should use propper urlbuilder.

My