Adding parts of an array?

[Magicmarkuk]

Apologies if this is not in the correct forum.

I have some php code which pulls back data relating to books in the format

ISBN|Author|Title|Price|Availability|URL|Standard Shipping|Binding

I have code which splits the 8 parts:

$pieces = split("|",$contentsarray[$n]);
$contentsarray2[$n][0] = $pieces[0];
$contentsarray2[$n][1] = $pieces[1];
$contentsarray2[$n][2] = $pieces[2];
$contentsarray2[$n][3] = $pieces[3];
$contentsarray2[$n][4] = $pieces[4];
$contentsarray2[$n][5] = $pieces[5];
$contentsarray2[$n][6] = $pieces[6];
$contentsarray2[$n][7] = $pieces[7];
$contentsarray2[$n][8] = $pieces[8];
$tempopenfile = @fopen("$tempurl", "r");
$n++;

some of which are later displayed in a table:

echo "<td><b>".$contentsarray2[$n][2]."</b><br>";
echo "Author: ".$contentsarray2[$n][1]."<br>";
echo "Binding: ".$contentsarray2[$n][7]."<br>";
echo "ISBN: ".$contentsarray2[$n][0]."</td><td align=center>";

The cost of the book is part 3 and the postage cost is part 6.

Is there any way that I can add these together to create a total cost?

Apologies if this is not clear as I am new to this and attempting to alter a script.

Many thanks

Mark

[devinemke]

simple math:

$total = $contentsarray2[$n][3] + $contentsarray2[$n][6];

BTW: based on your code snippet, you really don't need REGEX for splitting up your string. this will be marginally faster:

$pieces = explode('|', $contentsarray[$n]);

[Magicmarkuk]

Thank you very much for your speedy reply and help.

Regards

Mark