Accessing array within an array in multiple database rows - php

Question

I have a database structure that looks like the following:
I am trying to store the prices as a variables so that if I reference cage_linear_feet it will display 225.
I have tried the following code:
$sql = "SELECT * from pricing WHERE region = '$region' ";
$result = mysqli_query($conn, $sql);
while($rows=mysqli_fetch_assoc($result)){
$test[] = array($rows['field']=>$rows['price']);
}
print_r ($test);
This displays the following:
Array ( [0] => Array ( [cage_linear_feet] => 225 ) [1] => Array ( [cage_doors] => 1800 ) )
How do I access the "225" and "1800" values ensuring that if more records are added to the db it will still pick up the correct records. E.g as the $test1 which is cage_doors may change if records are added.

Answer 1

My opinion is that there is no point in wrapping the key-value pairs in their own separate arrays. I would change this line:
$test[] = array($rows['field']=>$rows['price']);
to this:
$test[$rows['field']] = $rows['price'];
The data association will be maintained in the key=>value pairs of one associative array ($test). So echo $test['cage_linear_feet'] ---> 225

Answer 2

If you want to set field as the array-key
$sql = "SELECT * from pricing WHERE region = '$region' ";
$result = mysqli_query($conn, $sql);
while($rows=mysqli_fetch_assoc($result)){
$test[$rows['field']] = $rows['price']);
}
print_r ($test);
No you should be able to reference by field like so:
echo $test['cage_doors'];
// returns 1800

Answer 3

Is the column 'field' unique? If so, do this:
while($rows=mysqli_fetch_assoc($result)){
$test[$rows['field']] = $rows['price'];
}
This will set the key in the array to the field, i.e.
Array('cage_doors' => 1800)
If its not unique, I recommend doing something like:
while($rows=mysqli_fetch_assoc($result)){
$test[$rows['field'] . '_' . $rows['pricing_id']] = $rows['price'];
}
This will set the key in the array to the field and the pricing id, which makes it unique, i.e.
Array('cage_doors_2' => 1800)