php - How can I convert record set from database to array?

How can I convert record set from database to array? It has 1 table named:tblproduct, with the following schema:

 product_id | product_name | product_desc | product_price | product_img
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When I select data from the database I would like an array in the following format:

$product_array = array(
  "105" => array('product_id' => '105', 'product_name' => 'Blackberry 8900',
                 'product_desc' => '', 'product_price' => '1150.00',
                 'product_img' => 'products/product5.jpg'),
  "106" => array('product_id' => '106', 'product_name' => 'Headphone with mic',
                 'product_desc' => '', 'product_price'=>'148.85', 
                 'product_img' => 'products/product8.jpg')
);
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Best regards