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<?php $array = [ ['Adams', 'King Street 12', '14:25', 'Heart Attack'], ['Ellis', 'Vine Street 4', '02:48', 'Broken Leg'], ['Adams', 'Parker Street 43', '20:10', 'Heart Attack'], ['Neil', 'Jack Street 9', '12:25', 'Broken Heart'], ['Colin', 'Queen Street 18', '05:48', 'Restless Leg'], ['Artemis', 'First Street 1', '10:17', 'Broken Leg'], ['Rufus', 'Long Street 5', '11:11', 'Dog Attack'], ]; $result = []; foreach ($array as $row) { if (isset($result[$row[3]])) { $result[$row[3]][] = $row; } elseif (isset($first[$row[3]])) { $result[$row[3]] = [$first[$row[3]], $row]; } else { $first[$row[3]] = $row; } } var_export($result);
Output for git.master_jit, git.master, rfc.property-hooks
array ( 'Heart Attack' => array ( 0 => array ( 0 => 'Adams', 1 => 'King Street 12', 2 => '14:25', 3 => 'Heart Attack', ), 1 => array ( 0 => 'Adams', 1 => 'Parker Street 43', 2 => '20:10', 3 => 'Heart Attack', ), ), 'Broken Leg' => array ( 0 => array ( 0 => 'Ellis', 1 => 'Vine Street 4', 2 => '02:48', 3 => 'Broken Leg', ), 1 => array ( 0 => 'Artemis', 1 => 'First Street 1', 2 => '10:17', 3 => 'Broken Leg', ), ), )

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