ãããªãã <?php class Follow implements Iterator { protected $first, $fn, $key = 0, $current_value, $is_valid = true; function __construct($first, $fn) { list($this->first, $this->fn) = func_get_args(); $this->current_value = $first; } function valid() { return $this->is_valid; } function next() { $result = call_user_func($this->fn, $this->current_value, ++$this->key); if ($result === false) { $this->
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