Php multi-dimensional array from mysql

Question

I have a mysql table that looks like this:

id | id_transaction | id_item    | 
1  |  it0001        | T0001      | 
2  |  it0001        | T0002      |
2  |  it0001        | T0003      |
3  |  it0002        | T0001      |
4  |  it0002        | T0003      |
5  |  it0003        | T0003      |
6  |  it0003        | T0004      |

and I am trying to build a multi-dimensional array that would end up looking like this:

Array
(
    array('T0001','T0002','T0003'),

    array('T0001','T0003'),

    array('T0003','T0004'),

);

I am using the select query:

$result = mysql_query("SELECT id_item,id_transaction from transaction_item ")or die("<br/><br/>".mysql_error());

Does anyone know how to do this?

Answer 1

1.Don't use mysql_* it's deprecated+removed now. Use mysqli_* OR PDO for this

2.You din't did anything after query execution.

A mysqli_* version code is:-

 <?php
     $dbhost = 'localhost'; //change credentails
     $dbuser = 'root';//change credentails
     $dbpass = '';//change credentails
     $dbname = 'TUTORIALS';//change credentails
     $conn = mysqli_connect($dbhost, $dbuser, $dbpass,$dbname);

     if(! $conn ) {
        die('Could not connect: ' . mysqli_error());
     }
     $sql = 'SELECT id_item,id_transaction from transaction_item';
     $result = mysqli_query($conn, $sql) or die(mysqli_error($conn));
     $final_array = array();
     if (mysqli_num_rows($result) > 0) {
        while($row = mysqli_fetch_assoc($result)) {
           $final_array[$row['id_transaction']][] = $row['id_item'];
        }
        echo "<pre/>";print_r(array_values($final_array));
     } else {
        echo "0 results";
     }
     mysqli_close($conn);

?>