Multi dimensional array basic question

[JakeMogul]

Hi,

 

I decided to learn PHP & MySQL from scratch with "PHP & MySQL in Easy Steps" by Mike McGrath.

 

Page 35 is a tutorial on Describing Dimensions.

 

I think I've done exactly what it says, but my output is weird.

 

The php code I wrote:

 

<?php


$letters = array('A','B','C','D','E','F','G');
$numbers = array(1,2,3,4,5,6);
$matrix = array('Letters'=> $letters,'Number'=> $numbers);


echo "<p>Start: {$matrix['Letter'][0]}</p>";


foreach($matrix as $array => $list) 
{
echo '<ul>';
foreach($list as $key => $value)
{echo "<li>$array[$key]=$value";}
echo '</ul>';
}


?>

 

According to the book should display like this:

 

Start: A

- Letter [0] = A

- Letter [1] = B

- Letter [2] = C

 

- Number[0] = 1

- Number[1] = 2

- Number[2] = 3

 

I've checked my code twice. And had a friend check it. Can't find a difference between the book and my code, yet mine appears like this:

 

 

Start:

• L=A
  
• e=B
  
• t=C
  
• t=D
  
• e=E
  
• r=F
  
• s=G
  

• N=1
  
• u=2
  
• m=3
  
• b=4
  
• e=5
  
• r=6
  

 

What's wrong with it!?

[Jessica]

So the syntax is:

foreach($array AS $key=>$value){...

 

Your matrix array has a KEY of 'Letters' and a value of $letters. When you use array syntax on a string like 'Letters' you get the character at that point in the string (starting at 0).

 

Try putting a space between $array and [$key]. Right now you're doing $array[$key] meaning the character at the key in that variable. You want to just echo the string that is $array and the string that is [$key].

[PFMaBiSmAd]

You are missing the {} in the following line that would cause the key/index name in $array to be literally output, instead of being treated as an array of characters -

 

echo "<li>{$array}[$key]=$value";

[JakeMogul]

Thanks guys. Putting a space between $array and [$key] did the trick.