Return specific array value in json format using php

Question

I want to display an output illustrated as json format but using PHP. I have an array for fruits and its color.

Array list

red = apple, strawberry

yellow = lemon, ripe mango

  <?php
  class FruitColor
  {
  private $fruitcolor;
  function FruitColor($fruitcolor)
  {
  $this->fruitcolor = $fruitcolor;
  }

  public function getFruits($color)
  {

  return NULL;
  }
  }

  $fruitcolor = new FruitColor(array(
"red" => array("apple", "strawberry"),
"yellow" => array("lemon", "ripe mango")
 ));

 echo $fruitcolor->getFruits("red");
 echo "\n";
 echo $fruitcolor->getFruits("violet");


 ?>

As you can see, this line echo $fruitcolor->getFruits("red"); represents red Where the output should be like this

{ "color":"red", "fruits": ["apple", "strawberry"]}

and if there's no color like violet in the array, the output should be like this

{ "color":"violet", "fruits":[] }

This way of coding like json is new to me. I guess i should use IF ELSE statement on this problem? But I dont know how can I implement it.

Answer 1

You can use json encode to do that. First you have to check if there is any fruits or not.

$fruits = isset($this->fruitcolor[$color]) ? $this->fruitcolor[$color] : array();

it's a shorthand version of if else statement which will return the fruits list if exists otherwise an empty array. Then you can encode that result using json_encode.

class FruitColor
{
    private $fruitcolor;

    function __construct($fruitcolor)
    {
        $this->fruitcolor = $fruitcolor;
    }

    public function getFruits($color)
    {
        $fruits = isset($this->fruitcolor[$color]) ? $this->fruitcolor[$color] : array();
        return array('color' => $color, 'fruits' => $fruits);
    }

    public function getFruitsJSON($color){
        return json_encode($this->getFruits($color));
    }
}

$fruitcolor = new FruitColor(array(
    "red" => array("apple", "strawberry"),
    "yellow" => array("lemon", "ripe mango")
));

echo $fruitcolor->getFruitsJSON("red");
echo "\n";
echo $fruitcolor->getFruitsJSON("violet");

Here getFruits will return the data as php array and getFruitsJSON will return that array as JSON encoded string.

WARNING: using same classname to declare constructor is deprecated, use __construct instead.

Answer 2

I'm not sure if I understand you. Normally what you do is going through serializer that serialize an object(in your case FruitColor) to some representation ex. JSON. What you want to do is that a method returns a json string which breaks SRP for sure but just for education let me help you with that.

  class FruitColor
  {
     private $fruitColors;

     public function __construct(array $fruitColors)
     {
         $this->fruitColors = $fruitColors;
     }

     public function getFruits(string $color): string
     {
         return json_encode([
             'color' => $color,
             'fruits' => $this->fruitColors[$color] ?? []
         ]);   
     }
  }  

  $fruitcolor = new FruitColor([
    "red"    => ["apple", "strawberry"],
    "yellow" => ["lemon", "ripe mango"],
  ]);

 echo $fruitcolor->getFruits("red");
 echo "\n";
 echo $fruitcolor->getFruits("violet");

The other better approach would be not to use json_encode in getFruits but use it on an array that is returned by this method.

Answer 3

Something like so....

<?php

class FruitColor
{
    private $fruitcolor = array ( );

    public function __construct ( $fruitcolor )
    {
        $this->fruitcolor = $fruitcolor;
    }

    public function getFruits ( $color )
    {
        return json_encode ( array ( 'color' => $color, 'fruits' => array ( ( ! empty ( $this->fruitcolor[$color] ) ? $this->fruitcolor[$color] : '' ) ) ) );
    }
}

  $fruitcolor = new FruitColor ( array ( 'red' => array ( 'apple', 'strawberry' ), 'yellow' => array ( 'lemon', 'ripe mango' ) ) );

 echo $fruitcolor->getFruits ( 'red' ) . "\r\n";

 echo $fruitcolor->getFruits ( 'violet' ) . "\r\n";


 ?>