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<?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 for git.master, git.master_jit, rfc.property-hooks
array(2) { [2017]=> array(2) { [1]=> array(0) { } [2]=> array(0) { } } [2018]=> &array(2) { [1]=> array(0) { } [2]=> array(0) { } } }

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