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<?php $arr = array ( array ('Q1',2017), array ('Q3',2017), array ('Q3',2012), array ('Q4',2015), array ('Q4',2017), array ('Q2',2017), ); $new = array(); foreach($arr as $subarr){ $new[$subarr[1]][] = $subarr[0]; sort($new[$subarr[1]]); } ksort($new); $finalarr = array(); foreach($new as $key => $val){ foreach($val as $k=>$v){ $finalarr[] = array($v, $key); } } echo "<pre>"; print_r($finalarr);
Output for git.master, git.master_jit, rfc.property-hooks
<pre>Array ( [0] => Array ( [0] => Q3 [1] => 2012 ) [1] => Array ( [0] => Q4 [1] => 2015 ) [2] => Array ( [0] => Q1 [1] => 2017 ) [3] => Array ( [0] => Q2 [1] => 2017 ) [4] => Array ( [0] => Q3 [1] => 2017 ) [5] => Array ( [0] => Q4 [1] => 2017 ) )

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