Could someone translate two lines of code for me please?

I'm in the middle of a teach yourself php book but there are two lines that have not been explained properly. I've been trying to figue it out for about an hour.

PHP Code:

$CatalogFile = "catalog.dat";

if (file_exists($CatalogFile)) {
   $Data = file($catalogFile);
     foreach ($data as $line) {
      $lineArray = explode(':', $line);
      $sku = trim($lineArray[0]);
      $CATALOG[$sku] ['desc'] = trim($lineArray[1]);
      $CATALOG[$sku] ['price'] = trim($lineArray[2]);
     }
} else { 
die("Could not find catalog file");
} 


example line for catalog.dat

101:AA batteries (pack of 2) : 2.99

I understand it all apart from -

PHP Code:

$CATALOG[$sku] ['desc'] = trim($lineArray[1]);
$CATALOG[$sku] ['price'] = trim($lineArray[2]); 


I know it's an associative array. But why [$sku] and ['desc'] for the first and [$sku] and ['price'] for the second? I guess that ['desc'] and ['price'] are the keys.


I can't get my head around it.

thankyou

$lineArray = explode(':', $line);
This line explodes the line with ':'
now $lineArray is an array with three element e.g:101,AA batteries (pack of 2),2.99
$sku = trim($lineArray[0]);
assigns $sku a number, the product id.
Now it creates an associative array $CATALOG with the number:
LIKE,
$CATALOG[101] ['desc'] = AA batteries (pack of 2)
$CATALOG[101] ['price'] = 2.99
This is known as file parsing .
Is it clear?

First, its splitting the text line into an array by exploding at the colon. So the line

101:AA batteries (pack of 2) : 2.99

Breaks apart as

[0] => 101
[1] => AA batteries (pack of 2)
[2] => 2.99

So $sku is being assigned the [0] value, and then creates a multidemintional array for the other values.

So the var is as follows:

$CATALOG[101]['desc'] => AA batteries (pack of 2)
$CATALOG[101]['price'] => 2.99

So $CATALOG gets concatnated with [101]?

if the next code is [202] then of course this means that -

$CATALOG[102]['desc'] => AA batteries (pack of 2)
$CATALOG[102]['price'] => 2.99

so $CATALOG[101] is one array and $CATALOG[102] is a different array? or can you have Numeric and Associative arrays working together?

I hope this make sense.

Originally Posted by jason_bristol

So $CATALOG gets concatnated with [101]?

if the next code is [202] then of course this means that -

$CATALOG[102]['desc'] => AA batteries (pack of 2)
$CATALOG[102]['price'] => 2.99

so $CATALOG[101] is one array and $CATALOG[102] is a different array? or can you have Numeric and Associative arrays working together?

I hope this make sense.

yes you can work with numeric and associative array together.

thanks! I understand now. talkupation ofcourse added