fix and test php_to_byte() related to #2756 #2556

This refactors the php_to_byte() method to properly return integers
always. A bug when reading byte sizes under 10 bytes was fixed. Infinity
(signal

fix and test php_to_byte() related to #2756 #2556

This refactors the php_to_byte() method to properly return integers
always. A bug when reading byte sizes under 10 bytes was fixed. Infinity
(signaled by a -1 in php.ini) is now returned as -1.

According to [1] PHP supports size shortcuts for (K)ilobytes,
(M)egabytes and (G)igagbytes only. The support for Tera- and Petabytes
has been removed.

[1] https://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes

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