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<?php $array = [ [1, 2014, 'context' => 'aaa'], [12, 2014, 'context' => 'aaa'], [5, 2014, 'context' => 'zzz'], ]; foreach ($array as $i => &$row) { if (!isset($ref[$row['context']])) { $ref[$row['context']] = &$row[0]; } else { $ref[$row['context']] += $row[0]; unset($array[$i]); } } var_export($array);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => 13, 1 => 2014, 'context' => 'aaa', ), 2 => array ( 0 => 5, 1 => 2014, 'context' => 'zzz', ), )

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