php - How to delete an array element based on key?

Possible Duplicate:
How to delete an element from an array in php?

For instance,

Array(      
    [0] => Array
        (
            [0] => hello
            [1] => open
        )

    [1] => Array
        (

            [0] => good
            [1] => center
        )

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

I want to delete the element which key is 1, after the operation:

Array(
    [0] => Array
        (
            [0] => hello
            [1] => open
        )


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

Answer

PHP

unset($array[1]);