php symfony/var-dumper安装打印插件的方法

$records = array(
            array(
                'id'         => 2135,
                'first_name' => 'John',
                'last_name'  => 'Doe',
            ),
            array(
                'id'         => 3245,
                'first_name' => 'Sally',
                'last_name'  => 'Smith',
            ),
            array(
                'id'         => 5342,
                'first_name' => 'Jane',
                'last_name'  => 'Jones',
            ),
            array(
                'id'         => 5623,
                'first_name' => 'Peter',
                'last_name'  => 'Doe',
            )
        );

dump($records);