数据库数组仅返回一行

Question

I am sorry for my lazy title. I hope that a moderator could improve it so the database won't get infected.

I got the following code ( forum.php );

<?php

$res = $db->query('
  SELECT *
  FROM forums_categories
  ORDER BY category_id
');

while ($row = $db->fetch_array($res)) {
  $categories = array(
    'ID'   => $row['category_id'],
    'NAME' => $row['category_name']
  );

  echo '<pre>';
  print_r($categories);
  echo '</pre>';
}

And I got the following database structure;

|---------------|-------------------|
|  category_id  |  category_name    |
|---------------|-------------------|
|  1            | Example 1         |
|  2            | Example 2         |
|  3            | Example 3         |
|  4            | Example 4         |
|  5            | Example 5         |
|  6            | Example 6         |
|---------------|-------------------|

But my array only returns 1 value:

Array
(
    [ID] => 1
    [NAME] => Example 1
)

Oh and if somebody likes to know how my $db->fetch_array looks like:

<?php

function fetch_array($result)
{
return mysql_fetch_assoc($result);
}

How can I return all rows in my array? Thank you for reading and thank you for replying!

Answer 1

You're overwriting the previous value of $categories on each iteration

$categories[] = array(
    'ID'   => $row['category_id'],
    'NAME' => $row['category_name']
  );

You might also want to initialize an empty array

$categories = array();

before your loop to avoid warnings.