[TYPO3-core] RFC #15021: Cleanup: replace calls to t3lib_div::testInt with calls to is_int, mark t3lib_div:testInt as deprecated

[Dmitry Dulepov]

Hi!

Michiel Roos [netcreators] wrote:
> V2 adds: self::logDeprecatedFunction(); to the testInt function.

-1 for the same reason as previous patch: is_int() does not do the same as
t3lib_div::testInt():

t3lib_div::testInt('5') returns true
is_int('5') returns false

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Dmitry Dulepov
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