PHP 5.3 Namespaces should i use every PHP function with backslash?

Question

im now using namespaces in PHP 5.3 now there is a fallback mechanism for functions which dont exist in the namespace. so php every time checks if the function exists in name

Answer 1

No matter the performance hit, no way should you do that. Ew, ew, ew. Any performance boost there may be is not worth your sanity.