I can answer #2 for you...
http://php.net/manual/en/language.types.type-juggling.php
http://php.net/manual/en/language.types.string.php#language.types.string.conversion
An excerpt from "String Conversion":
The value is given by the initial portion of the string. If the string
starts with valid numeric data, this will be the value used.
Otherwise, the value will be 0 (zero).
It might be a good idea if switch didn't convert its types, but then
that would be inconsistent with the rest of the language, so maybe
not.
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