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
- SeekableIterator::seek — Seeks to a position