文字
The LimitIterator class
(PHP 5 >= 5.1.0)
简介
LimitIterator类允许遍历一个 Iterator 的限定子集的元素.
类摘要
LimitIterator extends IteratorIterator implements
OuterIterator
{
public __construct
( Iterator
$iterator
[, int $offset = 0
[, int $count = -1
]] ) public mixed current
( void
)
public Iterator getInnerIterator
( void
)
public int getPosition
( void
)
public mixed key
( void
)
public void next
( void
)
public void rewind
( void
)
public int seek
( int
$position
) public bool valid
( void
)
}范例
Example #1 LimitIterator usage example
<?php
// Create an iterator to be limited
$fruits = new ArrayIterator (array(
'apple' ,
'banana' ,
'cherry' ,
'damson' ,
'elderberry'
));
// Loop over first three fruits only
foreach (new LimitIterator ( $fruits , 0 , 3 ) as $fruit ) {
var_dump ( $fruit );
}
echo "\n" ;
// Loop from third fruit until the end
// Note: offset starts from zero for apple
foreach (new LimitIterator ( $fruits , 2 ) as $fruit ) {
var_dump ( $fruit );
}
?> 以上例程会输出：
string(5) "apple" string(6) "banana" string(6) "cherry"string(6) "cherry" string(6) "damson" string(10) "elderberry"
Table of Contents
- LimitIterator::__construct — Construct a LimitIterator
- LimitIterator::current — Get current element
- LimitIterator::getInnerIterator — Get inner iterator
- LimitIterator::getPosition — Return the current position
- LimitIterator::key — Get current key
- LimitIterator::next — Move the iterator forward
- LimitIterator::rewind — Rewind the iterator to the specified starting offset
- LimitIterator::seek — Seek to the given position
- LimitIterator::valid — Check whether the current element is valid