Solved

Size of multi-dimensional array

Posted on 2006-06-28
4
2,992 Views
Last Modified: 2011-10-03
I know this is probably easy, but I haven't found the answer yet - I need to loop thru a 2-d array.

array(0, array('a','b','c','d','e'), 1, array('f','g','h','i','j'), 2, array('k','l','m','n','o'))

Is there an easy way to find out that my array is 3x5?  I need to know the dimensions because I need to group the data together (a-e, f-j, and k-o) for display purposes.
0
Comment
Question by:BigMonkeyHead
  • 2
4 Comments
 
LVL 6

Accepted Solution

by:
mattjp88 earned 125 total points
ID: 17006839
well, count($array) will return the size of the 1D part.  You could do count($array[0]) to find the 2D part.  That will work fine if you know all the elements have the same 2D array size.

but if you do need to loop through the entire array:

$arr=array(array('a','b','c','d','e'), array('f','g','h','i','j'), array('k','l','m','n','o'));

for ($a=0;$a<count($arr);$a++)
 for ($b=0;$b<count($arr[$a]);$b++)
  echo $arr[$a][$b];

-Matt
0
 
LVL 1

Author Comment

by:BigMonkeyHead
ID: 17006863
Thanks Matt!
0
 
LVL 10

Expert Comment

by:Khanh Doan
ID: 17006913
array(0, array('a','b','c','d','e'), 1, array('f','g','h','i','j'), 2, array('k','l','m','n','o'))

your array should be

array(array('a','b','c','d','e'), array('f','g','h','i','j'), array('k','l','m','n','o'))

so, to loop through 2-d array :

$arr = array(array('a','b','c','d','e'), array('f','g','h','i','j'), array('k','l','m','n','o'));
for ($i = 0; $i < count($arr); $i++)
{
      for ($j = 0; $j < count($arr[$i]); $j++)
      {
            echo ' [' . $i . '][' . $j . '] = ' . $arr[$i][$j];
      }
      echo "<br>";
}

Bonmat86.
0
 
LVL 10

Expert Comment

by:Khanh Doan
ID: 17006918
oops, sorry...

Bonmat86.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article will explain how to display the first page of your Microsoft Word documents (e.g. .doc, .docx, etc...) as images in a web page programatically. I have scoured the web on a way to do this unsuccessfully. The goal is to produce something …
Nothing in an HTTP request can be trusted, including HTTP headers and form data.  A form token is a tool that can be used to guard against request forgeries (CSRF).  This article shows an improved approach to form tokens, making it more difficult to…
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question