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@ 2015-09-29T12:39:36Z

<?php

$x = new DateTimeImmutable('2015-07-31');

$y = $x->modify('last day of -1 month');
var_dump($y);
$z = $y->setDate($y->format('Y'), $y->format('n'), 15);
var_dump($z);

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

44.42 ms | 402 KiB | 5 Q