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@ 2013-03-06T15:20:34Z

<?php

$dates = array(
    new \DateTime('2013-05-01'),
    new \DateTime('2013-04-01'),
);

usort($dates, function ($a, $b) {
    if ($a == $b) {
        return 0;
    }
});

Output
Performance
VLD
References
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usort: documentation ( source)

preferences:dark modelive preview

58.29 ms | 402 KiB | 5 Q