Description:
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From manual page: https://php.net/datetime.createfromformat
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Format character "u" doesn't handle correctly "up to" 6 characters microseconds values in PHP < 5.3.7. I think it should be stated in docs, because system working on such version still exists because of register_globals and few other breaking changes.

I choose version as "irrevelant", because docs are just misleading, no matter if it hits version 5 or 7 :)

Test script:
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<?php
$dt = DateTime::createFromFormat('u', '123');
var_dump($dt);
var_dump(DateTime::getLastErrors());

Expected result:
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I don't think there will be fix released for PHP5, so it could be nice to see docs updated.

Actual result:
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No info in docs that "u" format character works differently on older PHP versions.