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Size of multi-dimensional array

Posted on 2006-06-28
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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.
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Question by:BigMonkeyHead
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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
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by:BigMonkeyHead
ID: 17006863
Thanks Matt!
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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.
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Expert Comment

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

Bonmat86.
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