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<?php $allTickets = array( array( 'date' => '2021-05-05 15:00:00', 'email' => 'aaa@gmail.com' ), array( 'date' => '2021-05-05 14:00:00', 'email' => 'bbb@gmail.com' ), array( 'date' => '2021-05-05 13:00:00', 'email' => 'aaa@gmail.com' ), array( 'date' => '2021-05-05 12:00:00', 'email' => 'bbb@gmail.com' ), array( 'date' => '2021-04-02 14:00:00', 'email' => 'ccc@gmail.com' ), array( 'date' => '2021-05-02 12:00:00', 'email' => 'bbb@gmail.com' ), array( 'date' => '2021-05-02 11:00:00', 'email' => 'aaa@gmail.com' ), array( 'date' => '2021-05-01 11:00:00', 'email' => 'bbb@gmail.com' ), array( 'date' => '2021-05-01 10:00:00', 'email' => 'aaa@gmail.com' ) ); $emails = array_column($allTickets, 'date', 'email'); var_export($emails); $res = array_reduce( $allTickets, function($res, $el) { //if }, [] );
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