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Hello i need help with this code, the problem is that i need to make a callback-function that only shows me the Price of the array
Like this image >> Like this image [1] this is my code i tried much things but i couldn't figure out help me pls

 $boeken = array( array("titel"=> "Stoner", "auteur" => "John Williams", "genre"=> "Fictie", "prijs"=> 19.99), array("titel"=> "De cirkel", "auteur" => "Dave Eggers", "genre"=> "Fictie", "prijs"=> 22.50), array("titel"=> "Rayuela", "auteur" => "Cortazar", "genre"=> "Fictie", "prijs"=> 25.50) ); function prijslijst(){ array_walk($boeken, "prijslijst"); } ?>```
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To change the value of an element from within the callback passed to array_walk() you merely need to pass the value by-reference to the callback. Any modification to the value modifies the original.

Like this:

array_walk($boeken, function (&$v) { $v = $v['prijs']; });

Here you're changing the value of each element in the array from an array to the value of $value['prijs'] which would change the first element from ["titel"=> "Stoner", "auteur" => "John Williams", "genre"=> "Fictie", "prijs"=> 19.99] to [19.99], for example.

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you can use array_map

$boeken = array( array("titel"=> "Stoner", "auteur" => "John Williams", "genre"=> "Fictie", "prijs"=> 19.99), array("titel"=> "De cirkel", "auteur" => "Dave Eggers", "genre"=> "Fictie", "prijs"=> 22.50), array("titel"=> "Rayuela", "auteur" => "Cortazar", "genre"=> "Fictie", "prijs"=> 25.50) ); $prijs= array_map(function ($item){ return $item['prijs']; },$boeken); var_dump($prijs);
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