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<?php $array = [ ['city' => 'NewYork', 'cash' => '1000'], ['city' => 'Philadelphia', 'cash' => '2300'], ['city' => 'NewYork', 'cash' => '2000'] ]; var_export( array_reduce( $array, function($result, $row) { static $ref; if (!isset($ref[$row['city']])) { $ref[$row['city']] = $row; $result[] = &$ref[$row['city']]; } else { $ref[$row['city']]['cash'] += $row['cash']; } return $result; } ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'city' => 'NewYork', 'cash' => 3000, ), 1 => array ( 'city' => 'Philadelphia', 'cash' => '2300', ), )

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