<[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
>How could I count the elements of each dimension of an array?
>I have this script, but it failed, thanks for any help
>$ojpp[0] = "1";
>$ojpp[1] = "2";
>$ojpp[2] = "3";
>$ojpp[3] = "4";
>$ojpp[0][1] = "1";
>$ojpp[0][2] = "2";
>$ojpp[0][3] = "3";
>$ojpp[0][0][1] = "1";
>$ojpp[0][0][2] = "2";
>$test1 = count($ojpp); // first dimension
>$test2 = count($ojpp[0]); // second dimension
>$test3 = count($ojpp[0][0]); // third dimension
>echo $test1;
>echo $test2;
>echo $test3;
>echo "<pre>";
>print_r($ojpp);
>echo "</pre>";
The problem with the code above isn't with how you count the dimensions of
the array, but how you assign values to the second and third dimensions.
Ordinarily, the code $ojpp[0][1] = "1" will create an array at $ojpp[0] and
set it's second element to be "1". On the first line of your code, however
you have *already* assigned the string value "1" to $ojpp[0].
So when PHP sees the code $ojpp[0][1] = "1" it thinks you're trying to use
the 'curly braces' syntax for accessing single characters of a string. This
syntax is not widely known, but essentially means you can access characters
in a string like elements of an array, by using curly braces. For example,<?
echo $string{2}; ?> will print the third character in $string. For reasons
unknown to me, PHP will also let you use square brackets on a string to
perform the same action ... eg <? echo $string[2]; ?> although this
alternate syntax is being phased out. ( For more info see:
http://us2.php.net/manual/en/language.types.string.php ).
So essentially PHP intereperets $ojpp[0][1] = "1" as being an attempt to
assign "1" as the second character to the string already assigned to
$ojpp[0]. Which begs the question: why assign "1" to $ojpp in the first line
of your code when you seem to want to reaplce it with an array on lines 5 -
8?
This kind of coding bug is a by-product of a type-juggling, permissive
languge that doesn't require you to pre-declare variables. To fix your code,
change the first line of your code to read:
$ojpp[0] = array();
Hope that helps,
Al
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