RecursiveFilterIterator::__construct()
(PHP 5 >= 5.1.0, PHP 7)
Create a RecursiveFilterIterator from a RecursiveIterator
说明
public RecursiveFilterIterator::__construct(RecursiveIterator$iterator)
Create a RecursiveFilterIterator from a RecursiveIterator.
参数
- $iterator
The RecursiveIterator to be filtered.
返回值
没有返回值。
范例
Basic RecursiveFilterIterator() example
<?php class TestsOnlyFilter extends RecursiveFilterIterator { public function accept() { // Accept the current item if we can recurse into it // or it is a value starting with "test" return $this->hasChildren() || (strpos($this->current(), "test") !== FALSE); } } $array = array("test1", array("taste2", "test3", "test4"), "test5"); $iterator = new RecursiveArrayIterator($array); $filter = new TestsOnlyFilter($iterator); foreach(new RecursiveIteratorIterator($filter) as $key => $value) { echo $value . "\n"; } ?>
以上例程的输出类似于:
test1 test3 test4 test5
RecursiveFilterIterator() example
<?php class StartsWithFilter extends RecursiveFilterIterator { protected $word; public function __construct(RecursiveIterator $rit, $word) { $this->word = $word; parent::__construct($rit); } public function accept() { return $this->hasChildren() OR strpos($this->current(), $this->word) === 0; } public function getChildren() { return new self($this->getInnerIterator() >getChildren(), $this->word); } } $array = array("test1", array("taste2", "test3", "test4"), "test5"); $iterator = new RecursiveArrayIterator($array); $filter = new StartsWithFilter($iterator, "test"); foreach(new RecursiveIteratorIterator($filter) as $key => $value) { echo $value . "\n"; } ?>
以上例程的输出类似于:
test1 test3 test4 test5
参见
- RecursiveFilterIterator::getChildren() Return the inner iterator's children contained in a RecursiveFilterIterator
- RecursiveFilterIterator::hasChildren() Check whether the inner iterator's current element has children
- FilterIterator::accept() Check whether the current element of the iterator is acceptable