building a multidimensional array from mysql with php - php

Question

I am trying to form a specific multidimensional array from a mysql result set.
I would like it to look like this:
array(
'product_name' => 'prod_1',
'categories' => array(1,2,3,4)
);
The db result return an array that looks something like this
Array
(
[0] => Array
(
[id] => 1
[product_name] => prod_1
)
[1] => Array
(
[id] => 2
[product_name] => prod_1
)
[2] => Array
(
[id] => 3
[product_name] => prod_1
)
[3] => Array
(
[id] => 4
[product_name] => prod_1
)
As you can see, i would like to group the product name and place the id into another array
Does anyone have any tips on how to do this?

Answer 1

$yourarray = array(array('id'=>1, 'product_name' => 'prod_1'), array('id'=>2, 'product_name' => 'prod_2'),array('id'=>3, 'product_name' => 'prod_3'));
$multiarray = array();
for($i=0; $i<count($yourarray);$i++){
$multiarray['product_name'][] = $yourarray[$i]['product_name'];
$multiarray['product_id'][] = $yourarray[$i]['id'];
}
print_r($yourarray); //original array
print_r($multiarray); //gives you multi array
Something similar to this?
Your original array:
Array
(
[0] => Array
(
[id] => 1
[product_name] => prod_1
)
[1] => Array
(
[id] => 2
[product_name] => prod_2
)
[2] => Array
(
[id] => 3
[product_name] => prod_3
)
)
The result would print:
Array
(
[product_name] => Array
(
[0] => prod_1
[1] => prod_2
[2] => prod_3
)
[product_id] => Array
(
[0] => 1
[1] => 2
[2] => 3
)
)

Answer 2

Did you try GROUP_CONCAT. It's something like:
SELECT name, GROUP_CONCAT(name) AS friends FROM friendships GROUP BY name;
Have a look for details here: http://forums.mysql.com/read.php?10,287931,287936#msg-287936

Answer 3

$yourarray = array(array('id'=>1, 'product_name' => 'prod_1'), array('id'=>2, 'product_name' => 'prod_1'), array('id'=>3, 'product_name' => 'prod_1'),array('id'=>4, 'product_name' => 'prod_1'));
$multiarray = array();
foreach ($yourarray as $value) {
if(!isset($multiarray['product_name'])) {
$multiarray['product_name'] = $value['product_name'];
}
$multiarray['categories'][] = $value['id'];
}
print_r($multiarray);