我正在寻找一种在类的所有实例上调用函数的方法，最好是通过静态方法调用。
例：
class number{
private $number;
static function addAll(){
//add all of the values from each instance together
}
function __construct($number){
$this->number = $number;
}
}
$one = new number(1);
$five = new number(5);
//Expecting $sum to be 6
$sum = number::addAll();
对此的任何帮助将不胜感激。谢谢！
可以这样完成：
class MyClass {
protected $number;
protected static $instances = array();
public function __construct($number) {
// store a reference of every created object
static::$instances [spl_object_hash($this)]= $this;
$this->number = $number;
}
public function __destruct() {
// don't forget to remove objects if they are destructed
unset(static::$instances [spl_object_hash($this)]);
}
/**
* Returns the number. Not necessary here, just because
* you asked for an object method call in the headline
* question.
*/
public function number() {
return $this->number;
}
/**
* Get's the sum from all instances
*/
public static function sumAll() {
$sum = 0;
// call function for each instance
foreach(static::$instances as $hash => $i) {
$sum += $i->number();
}
return $sum;
}
}