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Full Discussion: Pointers and array
Top Forums Programming Pointers and array Post 302856699 by yifangt on Tuesday 24th of September 2013 03:56:55 PM
Old 09-24-2013
Thanks Corona688!
I fully understand the full array is actually a big 1-dimension array from your previous reply.
I tried:
Code:
printf("The value in a[1] is: %p\n", a[1]);
    printf("The value in a[0] is: %p\n", a[0]);
    printf("The value in a[1][0] is: %p\n", a[1][0]);
    printf("The value in a[1][1] is: %p\n", a[1][1]);

Code:
Output:
The value in a[1] is: 0x7fff80c346a6
The value in a[0] is: 0x7fff80c346a0
The value in a[1][0] is: 0x7fff80c346a6
The value in a[1][1] is: 0x7fff80c346a8

The value in a[1][0][0] is: g
The value in a[1][0][1] is: h

first 4 printf() print addresses in fact, and I seem understand that:
Because a[1] is the first address of a two-way (3x2) array, so a[1] is the same as a[1][0], which in turn is the first address of two-elements array, so that (now value, not address) a[1][0][0] = g; a[1][0][1] = h.
My confusion is: How is the connection with the pointer (*pa)[2]? Here the [2] is the last dimension of the array a[4][3][2]. I treat each "2-element array" as a box---a single unit. so that (*pa)[2] points a[4][3], each unit is an address of an array. Right?
I thought pa[4][3] should point to an address of the array{'q', 'r'}, but it actually points to the element, char "r". I lost the connection here (*pa)[2] vs. pa[4][3].
Another confusion is the declaration of (*pa)[2] = &a[1][0] and (*ppa)[3][2] = &a[1]. The author is to emphasize the address of array and pointer. By array address only one anwer for char "r" which is a[2][2][1]. With pointer, you can have many ways(!?) What is the trick to connect two of them, say, if I declare (*pa)[2] = &a[2][0]?

Sorry I am so slow with this important point.
Last edited by yifangt; 09-24-2013 at 05:22 PM.. Reason: typo
 

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LEARN ABOUT PHP

next

NEXT(3) 								 1								   NEXT(3)

next - Advance the internal array pointer of an array

SYNOPSIS

       mixed next (array  &$array)

DESCRIPTION

       next(3) behaves like current(3), with one difference. It advances the internal array pointer one place forward before returning the element
       value. That means it returns the next array value and advances the internal array pointer by one.

PARAMETERS

	      o $array
		- The array being affected.

RETURN VALUES

	Returns the array value in the next place that's pointed to by the internal array pointer, or FALSE if there are no more elements.

       Warning

	      This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
	      Booleans for more information. Use the === operator for testing the return value of this function.

EXAMPLES

       Example #1

	      Example use of next(3) and friends

	      <?php
	      $transport = array('foot', 'bike', 'car', 'plane');
	      $mode = current($transport); // $mode = 'foot';
	      $mode = next($transport);    // $mode = 'bike';
	      $mode = next($transport);    // $mode = 'car';
	      $mode = prev($transport);    // $mode = 'bike';
	      $mode = end($transport);	   // $mode = 'plane';
	      ?>

NOTES

       Note

	       You  won't be able to distinguish the end of an array from a boolean FALSE element. To properly traverse an array which may contain
	      FALSE elements, see the each(3) function.

SEE ALSO

       current(3), end(3), prev(3), reset(3), each(3).

PHP Documentation Group 														   NEXT(3)
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