//Somewhere in your project, you may need to use autoload
include __DIR__ ."/vendor/autoload.php";

   /**  
     $table gets the array from the database.
     $user is the foreign key that represents the user who will receive the recommendation.
   **/
   use Tigo\Recommendation\Recommend; // import class
   $client = new Recommend();
   $client->ranking($table,$user); //optional third parameter refers to the score not accepted
   $client->euclidean($table,$user); //optional third parameter refers to the minimum accepted score
   $client->slopeOne($table, $user); //optional third parameter refers to the minimum accepted score

    const SCORE = 'score'; //score  
    const PRODUCT_ID = 'product_id'; //Foreign key
    const USER_ID = 'user_id'; //Foreign key 

  /**
     Example using "rating: liked and disliked"
     like: score = 1;  dislike: score = 0
  **/
   $table = [
        ['product_id'=> 'A',
         'score'=> 1, 
         'user_id'=> 'Pedro'
        ],
        ['product_id'=> 'B',
         'score'=> 1, 
         'user_id'=> 'Pedro'
        ],
        ['product_id'=> 'A',
         'score'=> 1, 
         'user_id'=> 'João'
        ],
        ['product_id'=> 'B',
         'score'=> 1, 
         'user_id'=> 'João'
        ],
        ['product_id'=> 'C',
         'score'=> 1, 
         'user_id'=> 'João'
        ]
  ];
  use Tigo\Recommendation\Recommend; // import class
  $client = new Recommend();
  print_r($client->ranking($table,"Pedro")); // result = ['C' => 2] 
  print_r($client->ranking($table,"Pedro",1)); // result = []; 
  
  print_r($client->euclidean($table,"Pedro")); // result = ['C' => 1]
  print_r($client->euclidean($table,"Pedro", 2)); // result = [] ;  
  
  print_r($client->slopeOne($table,'Pedro')); // result = ['C' => 1]
  print_r($client->slopeOne($table,'Pedro', 2)); // result = []