create a key value array based on array two values from different array

Question

I have this array:

$priceTableData = array(

    array('productId'=>1,'price'=>50,'discount'=>12),
    array('productId'=>2,'price'=>22,'discount'=>2),
    array('productId'=>3,'price'=>7,'discount'=>0),
    array('productId'=>4,'price'=>9,'discount'=>0),
    array('productId'=>5,'price'=>35,'discount'=>7),

);

and I want to get this array out of it:

array(5) { 
[1]=> int(12) 
[2]=> int(2) 
[3]=> int(0) 
[4]=> int(0) 
[5]=> int(7) 
}

and I used this custom method to do so,

function getDiscounts(array $priceData){

    $result = array();

    foreach ($priceData as $array){

        $result[$array['productId']] = $array['discount'];

    }
    return $result;
}

then I used it as this:

var_dump(getDiscounts($priceTableData));

my question is: is there a native way of doing so, rather than having a custom function for it?

Thanks.

John Conde · Accepted Answer · 2014-04-21 00:11:35Z

2

If you're using PHP 5.5 you can use array_column():

 $discounts= array_column($priceTableData , 'discount');

Demo

Since it was brought up in the comments I will also offer that if your array keys are defined by the product ID you should use the third parameters from array_column() to specify the productId as the keys in your new array:

$discounts= array_column($priceTableData , 'discount', 'productId ');

Demo

edited Apr 21, 2014 at 0:11

answered Apr 21, 2014 at 0:05

John Conde

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5 Comments

mamdouh alramadan Over a year ago

what if the id's are not in sequence?

John Conde Over a year ago

They didn't specify that was a factor in their desired results. In their specific case as asked in their question this code will serve their purposes.

mamdouh alramadan Over a year ago

$result[$array['productId']] = $array['discount']; they are using the id as the key

cg.mike Over a year ago

thanks I was not aware of such a function, can you tell me where I can find a list of the new functions in 5.5?

John Conde Over a year ago

Here's a list of new features. Here's a list of new functions.

mamdouh alramadan · Accepted Answer · 2014-04-21 00:05:59Z

2

you can use array_column which is introduced in PHP 5.5 like so

$result = array_column($priceTableData, 'discount','productId');

print_r($result);

answered Apr 21, 2014 at 0:05

mamdouh alramadan

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Comments

Ali Nouman · Accepted Answer · 2014-04-21 00:12:23Z

2

if older version of php.

    $result = array_map(function($sub)
 { return $sub['discount']; }, $priceTableData);

answered Apr 21, 2014 at 0:12

Ali Nouman

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