PHP Is it possible to sum elements of an array?

Question

I have an array which has multiple sets of data.

Is it possible to sum elements (not all) of the array. For example, is it possible to sum the first 5 sets of data in an array, then then next 7, then the next three etc.

EDIT:

I've tried the following but with not joy:

for ($p=0; $p<=8; $p++){
    $tot = 0;
    $resp = 0;

    $tot = $tot + $row4['Total_Staff'];
    $resp = $resp + $row4['Total_Resp'];

}

Clearly I am not using this correctly!

Array Output (print_r output):

Array ( [department] => Central>ACME>BusDev [Total_Staff] => 4 [Total_Resp] => 0 ) 
Array ( [department] => Central>ACME>ChemDev [Total_Staff] => 7 [Total_Resp] => 0 ) 
Array ( [department] => Central>ACME>Admin [Total_Staff] => 1 [Total_Resp] => 0 ) 
Array ( [department] => Central>ACME>Chemistry [Total_Staff] => 4 [Total_Resp] => 0 )

Anything is possible. Can you show what you've done so far and ask a specific question for us to help with? — jterry
– jterry, Commented Mar 11, 2014 at 14:00
combination of array_sum() with array_slice() should do it.... perhaps you should show why your array makes it any more complicated — Mark Baker
– Mark Baker, Commented Mar 11, 2014 at 14:03

Amal · Accepted Answer · 2014-03-11 14:12:12Z

4

Use array_splice() to remove $numOfElems elements from the array and the return them. Use array_sum() to calculate the sum. Repeat the process until the array is empty.

$array = array(/* your array */)
$sets = array(5,7,3);
$sum_arr = array();

foreach ($sets as $numOfElems) {
    while (!empty($array)) {
        $elem_arr = array_splice($array, 0, $numOfElems);
        $sum[] = array_sum($elem_arr);
    }
}

print_r($sum_arr);

This will repeat the process with the same sets until it reaches the end of array. If you only want count($sets) number of iterations, then perhaps, you could change while to if.

Demo

edited Mar 11, 2014 at 14:12

answered Mar 11, 2014 at 14:04

Amal

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8 Comments

Homer_J Over a year ago

Thanks Amal, seem to be having a problem - is this because my array has multiple sets of data (title, staff, responses)? Output from the above when I implement is lots of Array ().

Homer_J Over a year ago

Thanks for adding the demo - I think as I have three sets of data per array entry the above isn't working?

Homer_J Over a year ago

So, for the first three sets of data in the array I need to sum the staff part of the array and then `responses' part of the array etc.

Amal Over a year ago

@Homer_J: I have no idea how your array looks like. Add the output of echo '<pre>'.print_r($your_array_here, TRUE).'</pre>'; to the question.

Homer_J Over a year ago

there you go, thanks again for your assistance - struggling to get my head around this.

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