CODEWITHSUNDEEP
phparrays
Ifeoluwapo Ojikutu
Ifeoluwapo Ojikutu

Reputation: 69

Multiplying two arrays in php

I have a challenge multiplying two arrays. this is what i intend doing

Array1 ( [0] => 2 [1] => 2 )
Array2 ( [0] => 8000.00 [1] => 1234.00 )

Every time i multiply this it breaks it down into 4 and returns a result as this

Array ( [0] => 16000 [1] => 16000 [2] => 2468 [3] => 2468 )

However when i pass single a single data it gets it right. Here is my code, i'll appreciate any help i can get. Thanks

$total = array();
foreach($office_price as $price){
    foreach($office_quantity as $quantity){
        $total[] = $price * $quantity;
    }
}

Upvotes: 1

Views: 21946

Answers (8)

A.d.adams
A.d.adams

Reputation: 11

$total_in_array = array_map(function($x, $y) { return $x * $y; }, $office_price, $office_quantity); // This will return array of multiplied numbers
$total = array_sum($total_in_array); // This will return the total

Upvotes: 1

Calin Blaga
Calin Blaga

Reputation: 1373

function a($a, $b)
{
    $r = [];

    for($i = 0; $i < (count($a)); $i ++)
    {
        $r[] = $a[$i] * $b[$i];
    }

    return $r;
}

Upvotes: 0

Keshav Kalra
Keshav Kalra

Reputation: 315

Use Array map function it will works 

$total_hours = array(10, 20, 30);
    $hourly_rate = array(15, 10, 15);    

    $total_pay = array_map(function($hour, $rate) {
        return $hour * $rate;
    }, $total_hours, $hourly_rate);

Upvotes: 1

Ankit Agrawal
Ankit Agrawal

Reputation: 6124

$a= array (2,2);
$b= array(8000,1234);
$total = array();
for ($i=0;$i<count($a);$i++) {
   $total[] = $a[$i] * $b[$i];
  }

Upvotes: 1

Barmar
Barmar

Reputation: 780889

You can give multiple arrays to array_map, and it will process the corresponding elements:

$total = array_map(function($x, $y) { return $x * $y; },
                   $office_price, $office_quantity);

Upvotes: 19

Ming-Tang
Ming-Tang

Reputation: 17651

To multiply two arrays, you must do it elementwise: no nested loops involved. For example, if you want to get $total[2], then its value is $office_price[2] * $office_quantity[2]. Thus the one foreach loop. To loop through keys, use ... as $key => $price.

$office_price = array(10, 100, 1000);
$office_quantity = array(1, 2, 3);

$total = array();
foreach($office_price as $key => $price){
    $total[$key] = $price * $office_quantity[$key];
}

var_dump($total);
// array(3) { [0]=> int(10) [1]=> int(200) [2]=> int(3000) }

Upvotes: 0

Marty McVry
Marty McVry

Reputation: 2856

You loop through both arrays, so you get every value twice.

As you know, an array is built up using keys and values.

Use your foreach to that extent:

$total = array();
foreach ($office_price as $key=>$price) {
    $total[] = $price * $office_quantity[$key];
}

You only need to loop one array, and by using the value from the second array with the same key, you get the proper result.

Upvotes: 3

rakeshjain
rakeshjain

Reputation: 1761

Use this

$total = array();
for($i=0;$i<count($office_price);$i++){
        $total[] = $office_price[$i] * $office_quantity[$i];
}

Upvotes: 0

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