本篇文章分享的内容是【php预定义接口】迭代器,现在分享给大家,有需要的朋友可以参考一下本篇文章的内容
iterator(迭代器)接口
简介 :可在内部迭代自己的外部迭代器或类的接口。
具体作用解释
接口摘要 :
iterator extends traversable { /* 方法 */
abstract public mixed current ( void ) abstract public scalar key ( void ) abstract public void next ( void ) abstract public void rewind ( void ) abstract public bool valid ( void )
}
范例:
example #1 基本用法(使用 foreach 时,迭代器方法的调用顺序)<?phpclass myiterator implements iterator {
private $position = 0; private $array = array( "firstelement", "secondelement", "lastelement",
);
public function __construct() {
$this->position = 0;
} function rewind() {
var_dump(__method__); $this->position = 0;
} function current() {
var_dump(__method__); return $this->array[$this->position];
} function key() {
var_dump(__method__); return $this->position;
} function next() {
var_dump(__method__);
++$this->position;
} function valid() {
var_dump(__method__); return isset($this->array[$this->position]);
}
}$it = new myiterator;foreach($it as $key => $value) {
var_dump($key, $value); echo "\n";
}1.rewind -> valid -> current -> key
2.next -> valid -> current -> key3.next -> valid -> current -> key4.next -> valid?>
iterator(迭代器)接口
简介 :可在内部迭代自己的外部迭代器或类的接口。
具体作用解释
接口摘要 :
iterator extends traversable { /* 方法 */
abstract public mixed current ( void ) abstract public scalar key ( void ) abstract public void next ( void ) abstract public void rewind ( void ) abstract public bool valid ( void )
}
范例:
example #1 基本用法(使用 foreach 时,迭代器方法的调用顺序)<?phpclass myiterator implements iterator {
private $position = 0; private $array = array( "firstelement", "secondelement", "lastelement",
);
public function __construct() {
$this->position = 0;
} function rewind() {
var_dump(__method__); $this->position = 0;
} function current() {
var_dump(__method__); return $this->array[$this->position];
} function key() {
var_dump(__method__); return $this->position;
} function next() {
var_dump(__method__);
++$this->position;
} function valid() {
var_dump(__method__); return isset($this->array[$this->position]);
}
}$it = new myiterator;foreach($it as $key => $value) {
var_dump($key, $value); echo "\n";
}1.rewind -> valid -> current -> key
2.next -> valid -> current -> key3.next -> valid -> current -> key4.next -> valid?>
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php预定义变量详解
php预定义变量方法
以上就是【php预定义接口】迭代器的详细内容。