Two dimensional arrays -||- How?

[sfullman]

I have a two-dimensional array created. I would like to do the following:

1. find out the highest element number on the first dimension
2. find out the highest element number on the second dimension
3. iterate through the array something as folows (excuse the ASP/Visual Basic style of writing this but that is what I'm coming over from):

for ($i = 1 to upperbound_first_dimension) {
for ($j = 1 to upperbound_second_dimension) {

  //do some action on the array element
  echo $arrayName[$i][$j];

}
}

I realize the syntax is off but you get the idea -- it's a nested array.

I realy appreciate everyone's help and before long I'll be helping others similarly who need it.

Regards,
Sam Fullman

[Anon]

Couple of questions:

Is the second dimension always going to have the same number of elements? Is so, just use the count() function.

If not, you might want to review what you are doing with your code. You could be creating a loop for elements that don't exist in the current array.

Out of curiousity, what are you doing?

[btubalinal]

1. sizeof($your_array);
2. sizeof($your_array[0]); //or whatever element # your looking for
   3.
   for($i = 0;$i<sizeof($your_array);$i++){
   for($j = 0;$j<sizeof($your_array[$i]);$i++){
   //do some action on the array element
   echo $your_array[$i][$j];
   }
   }

[sfullman]

Well, you asked so I'll tell you.

This is part of a function that will evaluate dynamically created forms. A good example is if you pull several records (say photos for example) from a database and each record has 5 fields to change. I want to the create SQL statements to the database for each record. Each group of elements for a record I refer to as a "formlet." there could be 1, could be more "formlets" on the form.

So you've got a 2-d array, fields x records. The way I do it is to have php generate a name for each field based on the unique id of the record, like this:

FIELD NAME:
f000395001 = photo #395 (justifed to 6 places), field #001 (let's say, Name)
f000395002 = photo #395, field #002 (Description)
f000395003 = photo #395, (date added)

f000396001
f000396002
f000396003
etc., etc...

I've already created something like this in ASP but it's too slow. It's taken some time to get used to curly braces and semicolons but I'm doing good. :-)

Sam Fullman
Compass Point Media

[sfullman]

That doesn't seem to work.

The count($arrayName) and sizeof($arrayName) seem to be synonymous, however the:

sizeof($arrayName[0])

seems to be useless for any value (0,1,2, etc.) BTW my array has 3 records with 5 fields each so 1st dim = 3, 2nd dim = 5.

Any suggestions?

Sam Fullman
Compass Point Media

[Anon]

So you already know the size of your array... 3 x 5....

[Anon]

By the way, sizeof is an alias for count.
count returns the number of elements in an array. it also returns a 1 if the object is not an array (or has 1 element), and returns a 0 if the object is not set, or is an empty array.

You might want to use it along with the is_array function to make sure you are counting everything correctly.

[sfullman]

No, I don't.

The user can select "I want to edit x photograph records at a time" x could be any number, or indefinite based on a search for certain images. Each record will have a set number of form elements though. I refer to the elements for a particular record as a "formlet" for lack of a better word. So if field 001 is name, 002, is description, 003 is addDate, then I could have:

f000359001 = "dog"
f000359002 = "my dog skip"
f000359003 = "9/15/2001"
f000215001 = "cat"
f000215002 = "my cat meowing"
f000215003 = "1/1/2002"

and so on. NO, I don't know how many records are in the first dimension or even what order they're in. That's the job of this function, i.e. to sort the array.

Sam Fullman
Compass Point Media

[tomhath]

Try this:

$fruits = array (
"fruits" => array ("a"=>"orange", "b"=>"banana", "c"=>"apple"),
"numbers" => array (1, 2, 3, 4, 5, 6),
"holes" => array ("first", 5 => "second", "third")
);
//
echo "<BR>";
echo sizeof($fruits) . "<BR>";
echo sizeof($fruits["fruits"]) . "<BR>";
echo sizeof($fruits["numbers"]) . "<BR>";
echo sizeof($fruits["holes"]) . "<BR>";

foreach($fruits as $k => $v) {
foreach($v as $n => $m) {
echo "fruits[$k][$n] = " . $fruits[$k][$n] . "<BR>";
}
}

// Output should be:
3
3
6
3
fruits[fruits][a] = orange
fruits[fruits] = banana
fruits[fruits][c] = apple
fruits[numbers][0] = 1
fruits[numbers][1] = 2
fruits[numbers][2] = 3
fruits[numbers][3] = 4
fruits[numbers][4] = 5
fruits[numbers][5] = 6
fruits[holes][0] = first
fruits[holes][5] = second
fruits[holes][6] = third