CODEWITHSUNDEEP
phparraysforeachelement
user7141165
user7141165

Reputation:

Foreach only repeats last element of array

$amount = 2;
$array = array(3,6,12);
foreach($array as $a){
   $total = $a*$amount;  
}

result for only the last element:
int(24) int(12)

result must be: int(6) int(12) int(24)

I want to calculate a sum of all the elements in the array, but only the last element is calculated.

Upvotes: 0

Views: 233

Answers (4)

musashii
musashii

Reputation: 445

use array_map:

function double($v)
{      
    return $v * 2;
}

$a=array(3, 6, 12);
$resArr = array_map("double" ,$a));

the result will be an array [6, 12, 24]

Upvotes: 0

Ramsés Fernández
Ramsés Fernández

Reputation: 347

If you say that you want calculate sum elements of array $amount isn't neccesary.

You can use array_reduce You can see documentation here

function sumArray($carry, $item)
{
    $carry += $item;
    return $carry;
}

array_reduce($array, "sumArray");

if you need get array with (6,12,24) you can use

function sumArray($item)
    {

        return $item*2;
    }

    array_map("sumArray",$array); //array(6,12,24)

Upvotes: 1

Aman
Aman

Reputation: 370

Iterate over each element of the array passed as reference and update inside the loop, like this: 

$amount = 2;
$array = array(3,6,12);
foreach($array as &$a){
    $a = $a*$amount;  
}

var_dump($array);

Upvotes: 2

Niellles
Niellles

Reputation: 878

If this is indeed your code you should get a lot of undefined errors. You say that you want to get the sum, so why are you multiplying with $amount?

You want to do this:

<?php
$array = array(3,6,12);
$total = 0;
foreach($array as $a){
   $total += $a;  
}

Or even easier: Just use array_sum:

array_sum — Calculate the sum of values in an array

Like so:

<?php
$array = array(3,6,12);
echo array_sum($array);

Upvotes: 0

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