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<?php $dateTime1 = new DateTime('@0'); $dateTime2 = new DateTime('@0'); $dateTime3 = $dateTime1; var_dump($dateTime1 !== $dateTime2); var_dump($dateTime1 === $dateTime3); $dateTime1->modify('+1 day'); var_dump($dateTime1 === $dateTime3); var_dump($dateTime1, $dateTime2, $dateTime3);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) bool(true) object(DateTime)#1 (3) { ["date"]=> string(26) "1970-01-02 00:00:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } object(DateTime)#2 (3) { ["date"]=> string(26) "1970-01-01 00:00:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } object(DateTime)#1 (3) { ["date"]=> string(26) "1970-01-02 00:00:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }

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