[RSS Feed/News] Use global namespace version of functions to allow bytecode optimizations

[XenForo]

php supports converting a number of functions from function calls into specific bytecode as a fast-pass. This however requires the function be pulled from the global namespace, and in XF virtually call code is called from non-global namespace, which defeats this optimization.

A simple way would be to include something like this after the namespace declaration, in each file;
PHP:

use function strlen, is_null, is_bool, is_long, is_int, is_integer, is_float, is_double, is_string, is_array...

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