PHP - sum of two simple arrays to create [closed]

Question

Closed. This question needs details or clarity. It is not currently accepting answers.

Want to improve this question? As written, this question is lacking some of the information it needs to be answered. If the author adds details in comments, consider editing them into the question. Once there's sufficient detail to answer, vote to reopen the question.

Closed last year.

Improve this question

Array1 ( [a] => 1 [b] => 2 [c] => 7 [d] => ) 

Array2 ( [a] => 2 [x] => 4 [y] =>  )

I tried these to add the two arrays to get a new array where matching keys values are added. The final array would be:

Array3 ( [a] => 3 [b] => 2 [c] => 7 [d] => [x] => 4 [y] => )

I am looking at, but can't get the final array to display all keys:

    foreach($array1 as $key => $val)
        {
        $final_value = $val + $array2[$key]; 
        $final_array[] = array($key=>$final_value);
        }

Is that I have, but does not work.

I also looked at Jonah's suggestion at: Merge 2 Arrays and Sum the Values (Numeric Keys)

It is unclear and unexpected to have blank values in your input arrays. This missing component affects how answers are constructed and makes this page difficult to answer confidently. — mickmackusa
– mickmackusa ♦, Commented Jan 14, 2024 at 12:21

Paul Facklam · Accepted Answer · 2014-01-26 22:06:56Z

2

Here we go:

$firstArray = array ('a' => 1, 'b' => 2, 'c' => 7, 'd' => 0); // d must have a value
$secondArray = array ('a' => 2, 'x' => 4, 'y' =>  0); // y must have a value

$keys = array();
$result = array();

foreach($firstArray as $key => $value) {
    $keys[] = $key;
}

foreach($secondArray as $key => $value) {
    if(! in_array($key, $keys)) {
         $keys[] = $key;
    }
}

foreach($keys as $key) {

    $a = 0;
    $b = 0;

    if(array_key_exists($key, $firstArray)) {
        $a = $firstArray[$key];
    }

    if(array_key_exists($key, $secondArray)) {
        $b = $secondArray[$key];
    }

    $result[$key] = $a + $b;
}

print_r($result);

Output:

Array ( [a] => 3 [b] => 2 [c] => 7 [d] => 0 [x] => 4 [y] => 0 )

answered Jan 26, 2014 at 22:06

Paul Facklam

1,64312 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Emz · Accepted Answer · 2014-01-26 19:14:37Z

0

This goes through both arrays and compares their key to each other. It can be optimized a bit by checking so that it doesn't compare itself against previous values.

$array1 = array (
    'a' => 1,
    'b' => 2,
    'c' => 7,
    'd' => // needs a value
);

$array2 = array (
    'a' => 2
    'b' => 4
    'c' => // needs a value
);

foreach ($array1 as $key1 => $value1) {
    foreach ($array2 as $key2 => $value2) {
        if ($key1 == $key2) {
            $array3[$key1] = $value1 + $value2;
        }
    }   
}

answered Jan 26, 2014 at 19:14

Emz

1,2781 gold badge14 silver badges29 bronze badges

1 Comment

FartMachine4U Over a year ago

The 'if ($key1 == $key2)' will be true only if elements in same position have the same key name, otherwise it will not do the total.

miltos · Accepted Answer · 2014-01-28 13:41:23Z

0

try this code

$Array3 = $Array1;
foreach ($Array2 as $k => $v) {
    $Array3[$k] = $Array3[$k] + $Array2[$k];
}

answered Jan 28, 2014 at 13:41

miltos

1,0191 gold badge6 silver badges10 bronze badges

Collectives™ on Stack Overflow

PHP - sum of two simple arrays to create [closed]

3 Answers 3

Comments

1 Comment

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

Comments

Linked

Related