The LimitIterator class

(PHP 5 >= 5.1.0)

Вступ

The LimitIterator class allows iteration over a limited subset of items in an Iterator.

Короткий Огляд Класа

LimitIterator extends IteratorIterator implements OuterIterator {
/* Методи */
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 )
}

Приклади

Приклад #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($fruits03) as $fruit) {
    
var_dump($fruit);
}

echo 
"\n";

// Loop from third fruit until the end
// Note: offset starts from zero for apple
foreach (new LimitIterator($fruits2) as $fruit) {
    
var_dump($fruit);
}

?>

Наведений вище приклад виведе:

string(5) "apple"
string(6) "banana"
string(6) "cherry"

string(6) "cherry"
string(6) "damson"
string(10) "elderberry"

Зміст

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User Contributed Notes 1 note

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christophg at grenz-bonn dot de
1 year ago
If the inner iterator implements SeekableIterator, LimitIterator uses seek() after rewind() to move to the offset.
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