php mathematical addition of numerical values in 2 associative arrays

Question

Probably a simple one for you :

I have 2 arrays

$array1 = array(
  'foo' => 5,
  'bar' => 10,
  'baz' => 6
);

$array2 = array(
  'x' => 100,
  'y' => 200,
  'baz' => 30
);

I wish to get a third array by combining both the above, which should be :

$result_array = array(
  'foo' => 5,
  'bar' => 10,
  'baz' => 36,
  'x' => 100,
  'y' => 200,
);

Is there any built in 'array - way' to do this, or will I have to write my own function ? Thanks

Mark Baker · Accepted Answer · 2011-01-25 21:31:10Z

2

$resultArray = $array1;
foreach($array2 as $key => $value) {
   if (isset($resultArray[$key])) {
      $resultArray[$key] += $value;
   } else {
      $resultArray[$key] = $value;
   }
}

answered Jan 25, 2011 at 21:31

Mark Baker

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2 Comments

SIndhu Over a year ago

thanks, that works. How come there's no built in way for this i wonder. by the way, I havent negative voted any of the answers on this page ! i cant - vote anyways ;p

Mark Baker Over a year ago

Probably because you want to add the matching values, others might want to subtract, others to do a logical and, etc... so you'd need a function for every possible operation. And it isn't exactly difficult to write your own, just a few short lines of code

Core Xii · Accepted Answer · 2011-01-25 21:31:25Z

1

There's no built-in function for this, you'll have to write your own.

answered Jan 25, 2011 at 21:31

Core Xii

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1 Comment

Andrew Over a year ago

Not sure why this got downvoted; it explicitly and specifically answered the question: "Is there a function, or do I have to make my own?"

bharath · Accepted Answer · 2011-01-25 21:57:04Z

-2

you need

$newArray = $array1;
foreach($array2 as $key => $value) {
    if(array_key_exists($key, $newArray)){
     $newArray[$key] += $value;
    }else{
     $newArray[$key] = $value;
    }
}

edited Jan 25, 2011 at 21:57

answered Jan 25, 2011 at 21:28

bharath

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2 Comments

Mark Baker Over a year ago

OP is requesting that the values be added when the keys match

SIndhu Over a year ago

sorry, that ate up 6 from baz

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