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<?php $o = function () {}; var_dump($o); // just for visual compare var_dump((array) $o); // <-- the issue $o = new \DateTime('2013-02-20 20:00:12 UTC'); var_dump($o); var_dump((array) $o);
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(Closure)#1 (3) { ["name"]=> string(21) "{closure:/in/fQ0ep:3}" ["file"]=> string(9) "/in/fQ0ep" ["line"]=> int(3) } array(1) { [0]=> object(Closure)#1 (3) { ["name"]=> string(21) "{closure:/in/fQ0ep:3}" ["file"]=> string(9) "/in/fQ0ep" ["line"]=> int(3) } } object(DateTime)#2 (3) { ["date"]=> string(26) "2013-02-20 20:00:12.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } array(3) { ["date"]=> string(26) "2013-02-20 20:00:12.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
object(Closure)#1 (0) { } array(1) { [0]=> object(Closure)#1 (0) { } } object(DateTime)#2 (3) { ["date"]=> string(26) "2013-02-20 20:00:12.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } array(3) { ["date"]=> string(26) "2013-02-20 20:00:12.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

preferences:
51.86 ms | 870 KiB | 4 Q