文字
RecursiveFilterIterator::__construct
(PHP 5 >= 5.1.0)
RecursiveFilterIterator::__construct — 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
Example #1 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
Example #2 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