add and multiply results of a form

[skartdo]

I want to add together the values of a series of check boxes then multiply the result by a number that is derived from adding together the values of another different series of check boxes.

 

Any thoughts?

 

thanks

[Barand]

Group the c/boxes on the form into two arrays. When posted then you can use array_sum() on each group

 

The first group all have same name, say, name='gp1[]' and second set have name='gp2[]'.

 

to process

 

$tot1 = array_sum($_POST['gp1'];
$tot2 = array_sum($_POST['gp2'];

 

edit by ober to add closing php tags.

 

[alco19357]

HTML FORM

<form action="" method="post">
1<br>
<input type="checkbox" value="3" name="cb1[]"><br>
<input type="checkbox" value="6" name="cb1[]"><br>
<input type="checkbox" value="8" name="cb1[]"><br><br>
2<br>
<input type="checkbox" value="1" name="cb2[]"><br>
<input type="checkbox" value="2" name="cb2[]"><br>
<input type="checkbox" value="3" name="cb2[]"><br>
<input type="submit" value="calculate">
</form>

 

php

$group1 = $_POST['cb1'];
$group2 = $_POST['cb2'];
//calculate group 1
$group1_value = 0;
for($i=0; $i<count($group1); $i++){
  $group1_value = ($group1[$i])+($group1_value);
}

//calculate group 2
$group2_value = 0;
for($q=0; $q<count($group2); $q++){
  $group2_value = ($group2[$q])+($group2_value);
}

//multiply group 1 and 2
$end_value = $group1_value*$group2_value;

echo "End Value = ".$end_value;

 

How bout something like that?

 

[Barand]

or

 

$end_value = array_sum($_POST['gp1']) * array_sum($_POST['gp2']) ;