PHP – Make Iterator with PHP Class

Posted on September 3, 2015 by

PHP and iterators…

Violin and boxing…

Anyway, it is possible and the possibility is since some years ago.

In this article I will simply show how to make an iterator with a PHP class. And I would iterate in a table, with different background colors per row. And that is it!

In order to make an iterator with Php class, we need to define 5 functions in the class:

current()
key()
next()
rewind()
valid()

Once this is done, the iterator is ready :). And we may access it with the help of a foreach array.

Here comes the code:

<?
    class TopGames implements Iterator{
        
        public $price;
        public $game_collection = array();
    
        private $counter;
        
        public function current(){
            return $this->game_collection[$this->counter];    
        }
        
        public function key(){
            return $this->counter;
        }
        
        public function next(){
            $this->counter++;
        }
        
        public function rewind(){
            $this->counter = 1;
        }
        
        public function valid(){
            return isset($this->game_collection[$this->counter]);
        }        
    }
    
    $my_games = new TopGames;
    $my_games->price = 100;
    $my_games->game_collection = array("WC3 TFT", "AOE2", "Collin McRea Rally 2","Soldier of Fortune","Fifa 2001","Zanzarah - the hidden portal Demo");
    $my_str = "<table border = 7  >";
    $my_str .= "<tr><td>#</td><td>Price</td><td>Name</td></tr>";
    foreach ($my_games as $pc_game => $interesting_game){
        $my_str .= "<tr><td bgcolor = #ABCCAA>$pc_game </font></td><td bgcolor = #FAFACC>".round_up($my_games->price,3)." &euro;</td><td bgcolor = #AACACE>$interesting_game</td></tr>";
        $my_games->price *= 1.35;
        
    }
    function round_up($number, $precision = 2){
        $fig = (int) str_pad('1', $precision, '0');
        return (ceil($number * $fig) / $fig);
    }
    
    $my_str .="</table>";
    echo $my_str;
?>

class TopGames implements Iterator{

public $price;

public $game_collection = array();

private $counter;

public function current(){

return $this->game_collection[$this->counter];

}

public function key(){

return $this->counter;

}

public function next(){

$this->counter++;

}

public function rewind(){

$this->counter = 1;

}

public function valid(){

return isset($this->game_collection[$this->counter]);

}

$my_games = new TopGames;

$my_games->price = 100;

$my_games->game_collection = array("WC3 TFT", "AOE2", "Collin McRea Rally 2","Soldier of Fortune","Fifa 2001","Zanzarah - the hidden portal Demo");

$my_str = "<table border = 7 >";

$my_str .= "<tr><td>#</td><td>Price</td><td>Name</td></tr>";

foreach ($my_games as $pc_game => $interesting_game){

$my_str .= "<tr><td bgcolor = #ABCCAA>$pc_game </font></td><td bgcolor = #FAFACC>".round_up($my_games->price,3)." €</td><td bgcolor = #AACACE>$interesting_game</td></tr>";

$my_games->price *= 1.35;

}

function round_up($number, $precision = 2){

$fig = (int) str_pad('1', $precision, '0');

return (ceil($number * $fig) / $fig);

}

$my_str .="</table>";

echo $my_str;

Use responsibly. In Github.

🙂

PHP – Make Iterator with PHP Class

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