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@ 2017-09-17T16:21:37Z

<?php
$years = array(
    2018 => array(
        01 => array(),
        02 => array()
    ),
    2017 => array(
        02 => array(),
        01 => array()
    )
);
ksort($years);
foreach ($years as &$year) {
	ksort($year);
}
var_dump($years);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
ksort: documentation ( source)

preferences:dark modelive previewkey bindings

30.89 ms | 405 KiB | 5 Q