Performing calculation on each array element

Question

I have this array called $addon_array, that when i use var_dump shows up like this

array(10) { 
    ["ext_token"]=> string(5) "floor"  
    ["ext_token_child"]=> string(6) "carpet"  
    ["concrete"]=> string(1) "4"  
    ["cement"]=> string(1) "3"  
    ["sand"]=> string(1) "2"  
    ["wood_4_2"]=> string(1) "4"  
    ["wood_8_2"]=> string(1) "2"  
    [0]=> string(0) ""  
    ["brick"]=> string(3) "100"  
    ["carpet"]=> string(1) "3"
}

What I have bee trying to do most of the night is try and figure a way of cycling through all the different elements of the array (except ext_token and ext_token_child) and multiply each number via another variable called $qty (which can be anything, it doesn't matter).

Then I want them put in a new array again along with their corresponding columnNames (cement or sand etc...) I think it is jsut the simple case of just performing a foreach loop on each element, but I can't seem to be able to put them back into a new array.

Thanks for any and all help

What does this have to do with mysql or ajax?

John Carter
– John Carter

2012-08-26 09:54:42 +00:00
Commented Aug 26, 2012 at 9:54 — John Carter
– John Carter, Commented Aug 26, 2012 at 9:54

Ariel · Accepted Answer · 2012-08-26 09:52:32Z

2

$new_array = array();
foreach($addon_array as $key => $col) {
  if($key == 'ext_token' || $key == 'ext_token_child') {
    $new_array[$key] = $col;
  } else {
    $new_array[$key] = $col * $qty;
  }
}

answered Aug 26, 2012 at 9:52

Ariel

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3 Comments

Al Hennessey Over a year ago

ok brilliant, that looks good, what i will do though, is only add the elements that have the calculation performed on them added to the array, so for example ext_token and ext_toke_child, i would not add to the array, so would i just remove the $new_array[$key] = $col? Also, i just noticed i have a blank element in my array with no variables, how would i not perform a calculation on this? Thanks

Ariel Over a year ago

@Arken Yah, remove that line, then invert the meaning of the if statement so it only runs on valid values. For the blank one either check for blank: $col === '' (Note the three equals - this is VERY important). Or use is_numeric($col) and automatically check if it's a number - then you don't even need to check for ext_token since it's not a number.

Al Hennessey Over a year ago

Ok briliant, i just checked now and it works great, thanks for your help

knittl · Accepted Answer · 2012-08-26 09:57:38Z

2

This should work (using array_walk):

$new_array = array_walk($addon_array, function($v, $k) use ($qty) {
  if(in_array($k, array('ext_token', 'ext_token_child'))) return $v;
  return $v*$qty;
});

edited Aug 26, 2012 at 9:57

answered Aug 26, 2012 at 9:52

knittl

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1 Comment

Ariel Over a year ago

@Arken This version is a bit nicer since the array loop runs internally. But it's harder to understand for a newbie than mine.

Mihai Iorga · Accepted Answer · 2012-08-26 09:55:45Z

1

$qty = 10;
$newArray = array();
foreach($addon_array as $key => $val){
    if($key != 'ext_token' && $key != 'ext_token_child'){
        $newArray[$key]    = $qty*(int)$val;
    }
}

$newArray['ext_token'] = $addon_array['ext_token'];
$newArray['ext_token_child'] = $addon_array['ext_token_child'];

var_dump($newArray);

answered Aug 26, 2012 at 9:55

Mihai Iorga

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Comments

Matoha · Accepted Answer · 2012-08-26 09:56:15Z

0

Cycling through array in PHP is quite simple, use foreach.

$new = array();
foreach($addon_array as $key=>$value){

     if($key != "ext_token" OR $key != "ext_token_child"){
          $value = $value*$qty;
     }
     $new[$key] = $value;
}

answered Aug 26, 2012 at 9:56

Matoha

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