Fix #79015: undefined-behavior in php_date.c

We check that the given microsecond fraction is in the valid range
[0, 1000000[, and otherwise mark it as invalid. We also drop the
usel

Fix #79015: undefined-behavior in php_date.c

We check that the given microsecond fraction is in the valid range
[0, 1000000[, and otherwise mark it as invalid. We also drop the
useless do loop; a plain block is sufficient here.

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