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Using the canonical function name for PHP functions is strongly recommended, as aliases may be deprecated or removed without (much) warning. This replaces all uses of the following: * `join()` with `implode()` * `sizeof()` with `count()` * `is_writeable()` with `is_writable()` * `doubleval()` with a `(float)` cast In part, this is a follow-up to #47746. Props jrf. See #50767. git-svn-id: https://develop.svn.wordpress.org/trunk@49193 602fd350-edb4-49c9-b593-d223f7449a82