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<?php $a = [ [ 'group_id' => 2, 'contact' => 'foo', 'contact_email' => 'foo@gmail.com' ], [ 'group_id' => 2, 'contact' => 'bar', 'contact_email' => 'bar@gmail.com' ], [ 'group_id' => 2, 'contact' => 'foobar', 'contact_email' => 'bar@gmail.com' ], [ 'group_id' => 2, 'contact' => 'bar', 'contact_email' => 'bar@gmail.com' ] ]; $r = []; foreach($a as $v){ $r[$v['contact_email']] = $v; } print_r(array_values($r));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [group_id] => 2 [contact] => foo [contact_email] => foo@gmail.com ) [1] => Array ( [group_id] => 2 [contact] => bar [contact_email] => bar@gmail.com ) )

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