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PHP Integrating PHP with Databases Using Relational Tables Fetching Many Relationships

Posted by Michael Whalen
Michael Whalen
4,282 Points

Completely confused on how to add a secondary array for this exercise.

Below is output from a series of var_dumps I added to the program.

ROW: array(8) { ["media_id"]=> string(1) "3" ["title"]=> string(50) "Refactoring: Improving the Design of Existing Code" ["img"]=> string(25) "img/media/refactoring.jpg" ["genre_id"]=> string(2) "17" ["format"]=> string(9) "Hardcover" ["year"]=> string(4) "1999" ["category"]=> string(5) "Books" ["genre"]=> string(4) "Tech" }

GENRES array(1) { [17]=> array(1) { [0]=> string(4) "Tech" } }

ROW: array(8) { ["media_id"]=> string(1) "3" ["title"]=> string(50) "Refactoring: Improving the Design of Existing Code" ["img"]=> string(25) "img/media/refactoring.jpg" ["genre_id"]=> string(2) "51" ["format"]=> string(9) "Hardcover" ["year"]=> string(4) "1999" ["category"]=> string(5) "Books" ["genre"]=> string(8) "Business" }

GENRES array(2) { [17]=> array(1) { [0]=> string(4) "Tech" } [51]=> array(1) { [0]=> string(8) "Business" } }

ITEM array(8) { ["title"]=> string(50) "Refactoring: Improving the Design of Existing Code" ["category"]=> string(5) "Books" ["img"]=> string(25) "img/media/refactoring.jpg" ["format"]=> string(9) "Hardcover" ["year"]=> string(4) "1999" ["publisher"]=> string(27) "Addison-Wesley Professional" ["isbn"]=> string(14) "978-0201485677" [0]=> array(2) { [17]=> array(1) { [0]=> string(4) "Tech" } [51]=> array(1) { [0]=> string(8) "Business" } } }

index.php 
<?php

include "helper.php";

/*
 * helper contains the following variables:
 * $item is an array that contains details about the library item
 * $results is a PDOstatement object with our genre results.
 */

$genres = array();
while($row = $results->fetch(PDO::FETCH_ASSOC)) {

echo ("ROW:");
?> <br> <?php
var_dump($row);
?> <br><br> <?php

  $genres[$row["genre_id"]][] = $row["genre"];
  /*$item["genres"][] = $row["genres"]["genre_id"];*/
  /*$item["genres"][] = $genres;*/
  /*$item["genres"[$row["genre_id"]]][] = $row["genre"]; */
  /*$item[$genres[$row["genre_id"]]][] = $row["genre"]; */

echo ("GENRES");
?> <br> <?php
var_dump($genres);
?> <br><br> <?php

}

$item[] = $genres;

echo ("ITEM");
?> <br> <?php
var_dump($item);
?> <br><br> <?php

?>
Michael Whalen
Michael Whalen
4,282 Points

Thanks a lot.

1 Answer

Kyle McCullen
Kyle McCullen
16,639 Points

The challenge wants you to use the the variable specified ($item). All you need to do is the following:

while($row = $results->fetch(PDO::FETCH_ASSOC)) {
  $item["genres"][] = $row["genre"] ;
}

I hope this helps.