PHP Forum

**jwriter** · 09-10-2009, 01:59 AM

I am trying to create a multi-dimensional array...

PHP Code:


			
<?php // Script 4.6 - bv_03.php



// $my_array = array;

// (doesn't work)



for ($i = 1; $i <= 10; $i++) {

    $time = $i * 0.5;

    $other1 = rand (70, 80);

    $other2 = rand (40, 50);    

    $my_array[$i]['time'] = $time;

    $my_array[$i]['otherdata1'] = $other1;

    $my_array[$i]['otherdata2'] = $other2;



print "<br />  

<p>

$my_array[$i]['time'] and

    $my_array[$i]['otherdata1'] and

    $my_array[$i]['otherdata2'] 

</p>";



}

?>

Any help would be appreciated.

**lizciz** · 09-10-2009, 02:47 AM

You almost got it right. You just missed to initiate the array. Before the for loop, add this

PHP Code:


			
$my_array = array();

An just in case you didn't know, the "normal" behavior of an array is to start counting from index 0, not 1. So you might want to change the loop to

PHP Code:


			
for ($i = 0; $i < 10; $i++) {
   $time = ($i + 1) * 0.5;

Of course your way works aswell, but it's more common to start from 0.

**jwriter** · 09-10-2009, 04:16 AM

Thank you - I really appreciate the help. I initiated the array, but the loop is returning 10 lines of the following...

Array['time'] and Array['otherdata1'] and Array['otherdata2']

so I think there is something else wrong.

**Trey Walter** · 10:43 AM

I think you already created the array you want. The output is the problem.

PHP Code:


			
<?php // Script 4.6 - bv_03.php

// $my_array = array;
// (doesn't work)

for ($i = 0; $i < 10; $i++) {
    $time = $i * 0.5;
    $other1 = rand (70, 80);
    $other2 = rand (40, 50);    
    $my_array[$i]['time'] = $time;
    $my_array[$i]['otherdata1'] = $other1;
    $my_array[$i]['otherdata2'] = $other2;

    print "<br /><p>".$my_array[$i]['time']." and ".$my_array[$i]['otherdata1']." and ".$my_array[$i]['otherdata2']." </p>";

}
?>

It should work with this code. (At least it did on my local webserver...)

**jwriter** · 09-10-2009, 11:21 AM

Trey, the new print statement works well. Thanks!

I don't see any explanation in the manuals of the following construction...

Code:

".$my_array[$i]['time']."

Is this a way of nesting quotes within quotes?

**Trey Walter** · 09-10-2009, 11:40 AM

Quote:

Originally Posted by jwriter

Trey, the new print statement works well. Thanks!

I don't see any explanation in the manuals of the following construction...

Code:

".$my_array[$i]['time']."

Is this a way of nesting quotes within quotes?

You're welcome.

'.' is a string operator, here is a link to the manual: PHP String Operators
My construction is just a shorter way of writing something like this:

Code:

print "<br /><p>";
print $my_array[$i]['time'];
print " and ";
...