<?php 
$array = array(
             array('first' => 1, 'second' => 1),
array('first' => 1, 'second' => 1),
array('first' => 2, 'second' => 1),
array('first' => 3, 'second' => 1),
array('first' => 3, 'second' => 1),
array('first' => 3, 'second' => 1));

print_r($array);

Array
(
    [0] => Array
        (
            [first] => 1
            [second] => 1
        )

    [1] => Array
        (
            [first] => 1
            [second] => 1
        )

    [2] => Array
        (
            [first] => 2
            [second] => 1
        )

    [3] => Array
        (
            [first] => 3
            [second] => 1
        )

    [4] => Array
        (
            [first] => 3
            [second] => 1
        )

    [5] => Array
        (
            [first] => 3
            [second] => 1
        )

)