$data = eregi_replace("(.*)", prodwebsearch('\\1'), "$data");

function prodwebsearch($search) { 
# here search is fine
# search = ultra 5
return prodsearch($search); 
}

function prodsearch($search) { 
#here its not
# search = \1
return $search;
}

(this is just an example)

why does $search change to \1?