Blackbe.lt - Lithium Method Filters

calculate_filter.php

<?php
PriceCalculator::applyFilter('calculate', function($self, $args, $chain) {
    
    // code here will get executed before the calculation has occurred
    
    extract($args); //$qty, $item
    
    $total = $chain->next($self, $args, $chain);
    
    if (date('n') === "6") { 
        $total += 10;
    }
    
    // code here will get executed after the calculation has occurred
    
    return $total;
});

// get a fake item object
$item = new Item();
$item->price = 25.00;
$item->name = "Shoes";

echo PriceCalculator::calculate(4, $item); // 25 * 4 + 10 = 110
?>

price_calculator.php

<?php
class PriceCalculator extends \lithium\core\StaticObject {
    public static function calculate($qty, $item) {
        $price = $qty * $item->price;
        return $price;
    }
}
?>

price_calculator_filterable.php

<?php
class PriceCalculator extends \lithium\core\StaticObject {
    public static function calculate($qty, $item) {
        // make an array from the arguments
        $args = compact('qty', 'item');
        
        return static::_filter(
                __METHOD__, // the name of current method
                $args, // the arguments passed to the current method
                function($self, $args) {

                // extract the arguments in to individual variables in to the local scope
                extract($args);

                $price = $qty * $item->price;
                return $price;
            }
        );
    }
}
?>