It should be faster ..
The simple reason is that the PHP error triggering system is quite heavy, and even if E_STRICT errors are suppressed, they still introduce an error mechanism (only to ignore).
But actually it depends a lot on the situation, because I could imagine that working around E_STRICT in itself could also be heavier than the original solution.
Despite this, using E_STRICT is a smart idea and allows you to use more portable, future code. However, I would not use performance as a good reason to start writing rigorous PHP code.
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