SeekableIterator 接口
SeekableIterator
&reftitle.intro;
Seekable 迭代器。
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SeekableIterator
extends
Iterator
&Methods;
&InheritedMethods;
&reftitle.examples;
基础用法
本示例演示了如何创建自定义 SeekableIterator、查找位置和处理无效位置。
array[$position])) {
throw new OutOfBoundsException("invalid seek position ($position)");
}
$this->position = $position;
}
/* Iterator 接口所需的方法 */
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();
}
?>
]]>
&example.outputs.similar;
&reference.spl.entities.seekableiterator;