?????? ???? ??? ??? ???? ?? ???? ??? ?????. ?? ?? ??? ????? ?? ??? ???? ??? ???? ?? ??? ??????. PHP? ??? ?????? ???? ??? ??? ??? ?? ??? ?? ?? ? ????? ?????? ?????.
• PHP? ,
? ?????? ??? ???, ?? ?? ??? ? ?? ??? ???? ? ??? ?????. ? ?????? ??? ?, ??? ?? ?? ? ID? ?? ??? ??? ? ??? ??? ?? ?? ???? ???? ????? ??? ??? ??? ? ??? ? ????.
?? ?? ????? ??? ???? ??????? ?? ?? ??? ?? ?? ??? PHP?? ??? ??? ????????. ?? Python? ??? ??? ?? ????? ?? ??? ??? ??????? ??? ?????.
• ?? ?? ? ?? ?? ??? : Countable ??? ???? ?? ?? ?? (PHP? ??)? ???? ??? ???? ?? ? ? ????. ArrayAccess ??? ??? ? ???? Iterator ??? : count()
?? ??? ?? ??? ???? (??? ???)?? PHP?? ??? ?? ? ? ??? ?? ???? ?????.

?????? ??? ?? ??? ???? ???? ?????? ???? ?????? ??????.

class Members {
    public function __construct(array $members) {
        $this->members = $members;
    }

    // 其他方法
}

__iter__ ??? ???? ? ?? ??? ??? ????. ???? ???? ? ?? ??? ??? ????.

SPL ? PHP ????? PHP? ????? ??? ?????? ???? ??? ??? ???? ?? ??? ?? ?? ? ????? ?????? ?????.

class Members implements Iterator {
    private $members;
    private $position = 0;

    public function __construct(array $members) {
        $this->members = $members;
    }

    public function current() {
        return $this->members[$this->position];
    }

    public function key() {
        return $this->position;
    }

    public function next() {
        $this->position++;
    }

    public function rewind() {
        $this->position = 0;
    }

    public function valid() {
        return isset($this->members[$this->position]);
    }
}

$ls = new Members(["你", "我"]);

foreach ($ls as $member) {
    echo $member . "\n";
}

? ??? ????? ??? ???? ????. ??? ?? __contains__? ??????. ? ?? ?? ?

class Members {
    public function __construct(array $members) {
        $this->members = $members;
    }

    public function contains($member) {
        return in_array($member, $this->members);
    }
}

$members = new Members(["你", "我"]);

if ($members->contains("我")) {
    echo "我是一個(gè)成員！\n";
}

???.

isset($myObject["test"]);

class Members {
    public function __construct(array $members) {
        $this->members = $members;
    }

    // 其他方法
}

class Members implements Iterator {
    private $members;
    private $position = 0;

    public function __construct(array $members) {
        $this->members = $members;
    }

    public function current() {
        return $this->members[$this->position];
    }

    public function key() {
        return $this->position;
    }

    public function next() {
        $this->position++;
    }

    public function rewind() {
        $this->position = 0;
    }

    public function valid() {
        return isset($this->members[$this->position]);
    }
}

$ls = new Members(["你", "我"]);

foreach ($ls as $member) {
    echo $member . "\n";
}

class Members {
    public function __construct(array $members) {
        $this->members = $members;
    }

    public function contains($member) {
        return in_array($member, $this->members);
    }
}

$members = new Members(["你", "我"]);

if ($members->contains("我")) {
    echo "我是一個(gè)成員！\n";
}

isset($myObject["test"]);

interface Multiplier {
    public function multiply($num1, $num2);
}

class Members {
    public function __construct(array $members) {
        $this->members = $members;
    }

    // 其他方法
}

class Members implements Iterator {
    private $members;
    private $position = 0;

    public function __construct(array $members) {
        $this->members = $members;
    }

    public function current() {
        return $this->members[$this->position];
    }

    public function key() {
        return $this->position;
    }

    public function next() {
        $this->position++;
    }

    public function rewind() {
        $this->position = 0;
    }

    public function valid() {
        return isset($this->members[$this->position]);
    }
}

$ls = new Members(["你", "我"]);

foreach ($ls as $member) {
    echo $member . "\n";
}

class Members {
    public function __construct(array $members) {
        $this->members = $members;
    }

    public function contains($member) {
        return in_array($member, $this->members);
    }
}

$members = new Members(["你", "我"]);

if ($members->contains("我")) {
    echo "我是一個(gè)成員！\n";
}

isset($myObject["test"]);

? ??? ?? ?????? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!