How can I create a two-dimensional array?

How can I create a two-dimensional array? It is known that a while loop will generate n one-dimensional arrays: while (loop n times) {& nbsp; $ arr & nbsp; = & nbsp; array (...); // generate a one-dimensional array}. how can I put the n one-dimensional arrays in the list? how can I create a two-dimensional array?
It is known that a while loop will generate n one-dimensional arrays:
While (loop n times ){
$ Arr = array (...); // generates a one-dimensional array.
}

Then how can we put the n one-dimensional arrays into an array? Two-dimensional array
------ Solution --------------------
Let's take a look at the array_push () and array_merge () methods.
Http://www.w3schools.com/php/php_ref_array.asp
------ Solution --------------------
While (loop n times ){
$ Arr [] = array (...); // generates a one-dimensional array
}