PHP: array_sum

説明

mixed array_sum ( array arr)

array_sum() は、配列の中の値の合計を整数または floatとして返します。

例 1. array_sum() の例

<?php $a = array(2,4,6,8); echo "sum(a) = ".array_sum($a)."\n"; // 出力: sum(a) = 20 $b = array("a"=>1.2,"b"=>2.3,"c"=>3.4); echo "sum(b) = ".array_sum($b)."\n"; // 出力: sum(b) = 6.9 ?>
上のプログラムは次のように出力されます:
sum(a) = 20 sum(b) = 6.9

注意: 4.0.6より前のバージョンのPHPは、渡された配列自体を修正し、文字列を数値(これは値にもよるが多くの場合ゼロとなります)に変換していました。

add a note User Contributed Notes
array_sum

punchto at hotmail dot com
16-Mar-2005 04:06


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
02-Mar-2005 01:37


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
08-Feb-2005 03:02


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
08-Dec-2003 12:54


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

mucello NOO SPAM @ weatherimages dOt org
23-Oct-2003 12:44


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 06:40


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 12:14


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";

?>

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