average loop

[rwilson]

if i have an array like

 

$book = array("newbook" => array(10, 20, 30), "usedbook" => array(15, 25, 35));

 

and i want to average the three numbers for each book, how do i do it? i've tried several ways already and they don't work.

 

i want them to print out using a loop.

 

like,

 

col. 1      col. 2

new book  30

used book  25

[Yesideez]

<?php
  $arr=array("newbook" => array(10, 20, 30), "usedbook" => array(15, 25, 35));
  $newbooktotal=0;
  $usedbooktotal=0;
  foreach ($arr['newbook'] as $newbook) {
    $newbooktotal+=$newbook;
  }
  foreach ($arr['usedbook'] as $usedbook) {
    $usedbooktotal+=$usedbook;
  }
  echo 'Averages:<br />New='.$newbooktotal/count($arr['newbook']).'<br />Used='.$usedbooktotal/count($arr['usedbook']);
?>

I think thats about right...

[GingerRobot]

Perhaps a shorter way to do it:

 

<?php
$book = array("newbook" => array(10, 20, 30), "usedbook" => array(15, 25, 35));
foreach($book as $key => $value){
	$average = array_sum($value) / count($value);
echo "Average of: $key = $average <br />";
}
?>

[Yesideez]

Darn!

 

I keep forgetting about those brilliant array functions!

[GingerRobot]

Haha, i was annoyed there wasn't an array_average() function built in