Calculate two array values in php?

Question

i have two arrays like

    $a1                $b1
0 : A                  10
1:  B                  10
2:  A                  15
3:  A                  20
4: B                   05
5: c                   25

now i want to calculate them in same way then result is A=45, B=15 and C=25

So what have you tried so far?

lonesomeday
– lonesomeday

2012-08-23 13:31:06 +00:00
Commented Aug 23, 2012 at 13:31 — lonesomeday
– lonesomeday, Commented Aug 23, 2012 at 13:31

Peter · Accepted Answer · 2012-08-24 10:08:44Z

1

$calc = array_fill_keys($a1,0);
foreach($a1 as $i => $key) {
  $calc[$key] += $b1[$i];
}

$calc is array of calculated values:

[A] => 45,
[B] => 15
etc.

edited Aug 24, 2012 at 10:08

answered Aug 23, 2012 at 13:33

Peter

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3 Comments

Touki Over a year ago

Don't cheat with @, use $calc = array_fill_keys($a1,0) to remove the warnings

Jaiff JJ Over a year ago

can you tell me one more thing that how can i print $calc values in different html cells like A 45

Peter Over a year ago

echo "<table>"; foreach($calc as $key=>$value) { echo "<tr><td>{$key}</td><td>{$value}</td></tr>"; } echo "</table>";

Mark Baker · Accepted Answer · 2012-08-24 11:12:44Z

I know it's already been answered and accepted, and the accepted answer is a lot simpler and more efficient; but purely because I was tempted to try a rather different approach:

$a1 = array('A', 'B', 'A', 'A', 'B', 'c');
$b1 = array('10','10','15','20','05','25');

$sumArray = array();
foreach(array_unique($a1) as $key) {
    $arrayElements = array_filter(
                         $a1,
                         function($value) use ($key) {
                             return $value == $key;
                         }
                     );
    $sumArray[$key] = array_sum(
                          array_intersect_key(
                              $b1,
                              array_fill_keys(
                                  array_keys($arrayElements),
                                  NULL
                              )
                          )
                      );
}

var_dump($sumArray);

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