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<?php $arr = array ('Q1 2017'=>'some value', 'Q3 2017'=>'some value', 'Q3 2012'=>'some value', 'Q4 2015'=>'some value', 'Q4 2017'=>'some value', 'Q2 2017'=>'some value'); $new = array(); foreach($arr as $key=>$subarr){ $tempArr = explode(' ', $key); $new[$tempArr[1]][$tempArr[0]] = $subarr; asort($new[$tempArr[1]]); } ksort($new); $secondarr = array(); foreach($new as $k=>$v){ ksort($v); $secondarr[$k] = $v; } foreach($secondarr as $key => $val){ foreach($val as $k=>$v){ $newkey = $k.' '.$key; $finalarr[$newkey] = $v; } } echo "<pre>"; print_r($finalarr);
Output for git.master, git.master_jit, rfc.property-hooks
<pre>Array ( [Q3 2012] => some value [Q4 2015] => some value [Q1 2017] => some value [Q2 2017] => some value [Q3 2017] => some value [Q4 2017] => some value )

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