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<?php $arr = [ (object) [ "book" => "book 1", "n_ano" => "2013", ], (object) [ "book" => "book 2", "n_ano" => "2012", ], (object) [ "book" => "book 3", "n_ano" => "2013", ], ]; foreach($arr as $v) $data[$v->n_ano][] = $v->book; foreach($data as $n_ano => $books) { echo $n_ano . "<br>"; foreach($books as $book) echo " - " . $book . "<br>"; }
Output for git.master, git.master_jit, rfc.property-hooks
2013<br> - book 1<br> - book 3<br>2012<br> - book 2<br>

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