표준 PHP 라이브러리(SPL) The SeekableIterator interface

(PHP 5 >= 5.1.0, PHP 7, PHP 8)


소개

탐색 가능 반복자.


인터페이스 개요

                  
interface SeekableIterator extends Iterator {

  /* Methods */
  public seek(int $offset): void

  /* Inherited methods */
  public Iterator::current(): mixed
  public Iterator::key(): mixed
  public Iterator::next(): void
  public Iterator::rewind(): void
  public Iterator::valid(): bool
}
                  
                

Examples

예제 #1 기본 사용법

이 예제에서는 사용자 지정 SeekableIterator를 만들고 위치를 찾고 잘못된 위치를 처리하는 방법을 보여줍니다.

                  
<?php
class MySeekableIterator implements SeekableIterator {

    private $position;

    private $array = array(
        "first element",
        "second element",
        "third element",
        "fourth element"
    );

    /* Method required for SeekableIterator interface */

    public function seek($position) {
      if (!isset($this->array[$position])) {
          throw new OutOfBoundsException("invalid seek position ($position)");
      }

      $this->position = $position;
    }

    /* Methods required for Iterator interface */

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

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

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

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

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

try {

    $it = new MySeekableIterator;
    echo $it->current(), "\n";

    $it->seek(2);
    echo $it->current(), "\n";

    $it->seek(1);
    echo $it->current(), "\n";

    $it->seek(10);

} catch (OutOfBoundsException $e) {
    echo $e->getMessage();
}
?>
                  
                

위의 예는 다음과 유사한 결과를 출력합니다.

first element
third element
second element
invalid seek position (10)
                

목차