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<?php $meeting = array( array( 'name' => 'meeting1', 'year' => '2020' ), array( 'name' => 'meeting2', 'year' => '2020' ), array( 'name' => 'meeting3', 'year' => '2019' ), array( 'name' => 'meeting4', 'year' => '2018' ), array( 'name' => 'meeting5', 'year' => '2018' ) ); foreach($meeting as $e) { $array[$e['year']][] = array('name' => $e['name']); } print_r($array);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [2020] => Array ( [0] => Array ( [name] => meeting1 ) [1] => Array ( [name] => meeting2 ) ) [2019] => Array ( [0] => Array ( [name] => meeting3 ) ) [2018] => Array ( [0] => Array ( [name] => meeting4 ) [1] => Array ( [name] => meeting5 ) ) )

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