Update deprecations and BC breaks and extract strings for translation #33
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Removed the deprecation for returning a non-string from a user output handler, since it was reverted (php/php-src#20455). Also documented the warning for destructuring non-array values.
I also included a commit which reverts to the simpler
array_last()example. IMO the Stopwatch implementation details tend to obfuscate the benefit ofarray_last()rather than helping to highlight it.