reduce() public method

Reduce, or fold, a collection down to a single value
See link: http://php.net/array_reduce
public reduce ( callback $reducer, mixed $initial = false ) : mixed
$reducer callback The reduce function, i.e. `function($carry, $item) { return ... }`
$initial mixed Initial value passed to the reduce function as `$carry`, defaults to `false`.
return mixed A single reduced value.
Collection Class Documentation
Example #1
0
 public function testCollectionReduceFilter()
 {
     $collection = new Collection(array('data' => array(1, 2, 3)));
     $filter = function ($memo, $item) {
         return $memo + $item;
     };
     $result = $collection->reduce($filter, 0);
     $this->assertEqual(6, $collection->reduce($filter, 0));
     $this->assertEqual(7, $collection->reduce($filter, 1));
 }
Example #2
0
 /**
  * Reduce, or fold, a collection down to a single value
  *
  * Overridden to load any data that has not yet been loaded.
  *
  * @param callback $filter The filter to apply.
  * @param mixed $initial Initial value
  * @return mixed A single reduced value
  */
 public function reduce($filter, $initial = false)
 {
     if (!$this->closed()) {
         while ($this->next()) {
         }
     }
     return parent::reduce($filter, $initial);
 }