PHP - Sorting Multidimensional Arrays

This has been driving me NUTS for two days now. How to efficiently sort a multidimensional array by any column.

For example, say I have this multidimensional array (arrays withing an array):

Code:

---

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 20
            [2] => hello
        )

    [1] => Array
        (
            [0] => 2
            [1] => 1
            [2] => hi
        )

    [2] => Array
        (
            [0] => 3
            [1] => 100
            [2] => good evening
        )

    [3] => Array
        (
            [0] => 4
            [1] => 5
            [2] => good morning
        )
)

---

This data would actually be stored in a mysql database, and this is the format the array is in when I pull the data.

The first value in each array is the index, the second value is what I want to sort the array's by, and the third is just some textual information.

How would I sort the array so that it would become:

Code:

---

Array
(
    [0] => Array
        (
            [0] => 2
            [1] => 1
            [2] => hi
        )

    [1] => Array
        (
            [0] => 4
            [1] => 5
            [2] => good morning
        )

    [2] => Array
        (
            [0] => 1
            [1] => 20
            [2] => hello
        )

    [3] => Array
        (
            [0] => 3
            [1] => 100
            [2] => good evening
        )
)

---

Thanks for helping! I really haven't learned about sorting algorithms and appreciate it!

If the data is generated by a database then always sort the data from the database to output into an array. A small example...

Code:

---

SELECT * FROM table ORDER BY column ASC

---