PHP: array_sum

Description

number array_sum ( array array )

array_sum() returns the sum of values in an array as an integer or float.

Example 1. array_sum() examples

<?php $a = array(2, 4, 6, 8); echo "sum(a) = " . array_sum($a) . "\n"; $b = array("a" => 1.2, "b" => 2.3, "c" => 3.4); echo "sum(b) = " . array_sum($b) . "\n"; ?>
The above example will output:
sum(a) = 20 sum(b) = 6.9

Note: PHP versions prior to 4.2.1 modified the passed array itself and converted strings to numbers (which most of the time converted them to zero, depending on their value).

User Contributed Notes
array_sum

punchto at hotmail dot com
15-Mar-2005 09:06


Microsoft Excel - SUMIF()



function sumif($array,$criteria,$sum_array){ 

  if(is_array($array) && is_array($sum_array) && trim($criteria)!= ""){ 

    $array_count = (count($array) < count($sum_array)) ? count($array):count($sum_array);

    for($i=0;$i<$array_count;$i++){

      if(ereg("^<",$criteria)){

        $value = ereg_replace("^<","",$criteria);

        $result += $array[$i] < $value ? $sum_array[$i]:0; 

      }

      elseif(ereg("^>",$criteria)){ 

        $value = ereg_replace("^>","",$criteria);

        $result += $array[$i] > $value ? $sum_array[$i]:0;

      }

      else{

        $value = $criteria;

        $result += $array[$i] == $value ? $sum_array[$i]:0;

      }

      

    }

    return $result ? $result:0;

  }

}

adam at laural dot com dot au
01-Mar-2005 06:37


Here's a function to return the sum of a portion of an array:



function array_partial_sum($array, $start, $length){

    $new_array = array_slice($array, $start, $length);

    return array_sum($new_array);

}



$array = array(1, 2, 3, 4, 5);

print array_partial_sum($array, 0, 3);  // prints 6

ncheung at maine dot rr dot com
07-Feb-2005 08:02


For clarity, array indices containing boolean values such as TRUE and FALSE are added up as though they are 1 and 0 respectively.

info at sgonda dot de
07-Dec-2003 05:54


Don't use number_format() before array_sum()...it won't work correctly, if you have a summary...

mucello NOO SPAM @ weatherimages dOt org
22-Oct-2003 05:44


If you want to find the AVERAGE of the values in your array, use the sum and count functions together.  For example, let's say your array is $foo and you want the average...





<?php


$average_of_foo = array_sum($foo) / count($foo);


?>

mcrm at NOTNEEDIT dot freemal dot it
13-Aug-2003 11:40


Hi people, if someone is searching a function that works also with multimension array, i suggest this :





<?php


function cw_array_count($a) {


  if(!is_array($a)) return $a;


  foreach($a as $key=>$value) 


     $totale += cw_array_count($value);


  return $totale;


}





$a[0][E][PS][P][a1]=1;


$a[0][E][PS][P][a2]=2;


$a[0][E][PJ][P][a2]=2;


$a[1][E][PS][E][a3]=3;





echo cw_array_count($a[0]);


// or


echo cw_array_count($a[0][E]);


?>





Bye, Bye.


R.Martina

drverieevil at REMOVEMEasenne dot org
30-Jul-2003 05:14


If some array elements arent integers, function will change them to integers (content of array will not change) type and then sum them.



Example:

<?php

$foo[] = "12";

$foo[] = 10;

$foo[] = "bar";

$foo[] = "summer";

echo array_sum ($foo); //same as echo "22";

?>

search for in the