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@ 2018-12-27T22:40:19Z

<?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
Performance
VLD
References
Branches

array_map: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

27.42 ms | 405 KiB | 5 Q