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<?php $a = array(array('Holidays' => new DateTime('2018-01-01', new DateTimeZone('Europe/Berlin'))), array('Holidays' => new DateTime('2018-01-26', new DateTimeZone('Australia/Sydney')))); print_r($a); $a = array_map(function ($v) { return $v['Holidays']->format('Y-m-d'); }, $a); print_r($a);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [Holidays] => DateTime Object ( [date] => 2018-01-01 00:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Berlin ) ) [1] => Array ( [Holidays] => DateTime Object ( [date] => 2018-01-26 00:00:00.000000 [timezone_type] => 3 [timezone] => Australia/Sydney ) ) ) Array ( [0] => 2018-01-01 [1] => 2018-01-26 )

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