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@ 2016-01-21T11:51:53Z

<?php
$a = new DateInterval("P0Y0DT17H45M0S");
$b = new DateInterval("P0Y0DT21H15M0S");
$unique = array_unique([$a, $b], SORT_REGULAR);
var_dump($a == $b);
var_dump($unique);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_unique: documentation ( source)

preferences:dark modelive preview

37.65 ms | 402 KiB | 5 Q