<?php
class Foo {
	public $name;
	public $type;
 
	public function __construct($name, $type) {
		$this->name = $name;
		$this->type = $type;
	}
 
	public function searchZeroType($o) {
		return ($o->type == 0);
	}
 
	public function doubleType($o) {
		return $o->type = $o->type * 2; //Почему не получилось c return $o->type * 2;
	}
}
 
class SplObjectFunctions {
	public static function object_filter(callable $c, $objectStorage) {
		$s = new SplObjectStorage();
 
		foreach($objectStorage as $object) {
			if ($c($object)) {
				$s->attach($object);
			}
		}
 
		return $s;
	}
 
	public static function object_map(callable $c, $objectStorage) {
		$s = $objectStorage;
 
		foreach($s as $object) {
			$c($object);
		}
 
		return $s;
	}
}
 
$a = new SplObjectStorage();
 
$a->attach(new Foo('first', 1));
$a->attach(new Foo('second', 1));
$a->attach(new Foo('third', 0));
$a->attach(new Foo('fourth', 1));
 
 
$search = SplObjectFunctions::object_filter(array('Foo', 'searchZeroType'), $a);
$double = SplObjectFunctions::object_map(array('Foo', 'doubleType'), $a);
 
print_r($double);

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