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PHP | CachingIterator rewind() Function

  • Last Updated : 26 Nov, 2019

The CachingIterator::rewind() function is an inbuilt function in PHP which is used to rewind the iterator.

Syntax:

void CachingIterator::rewind( void )

Parameters: This function does not accept any parameters.

Return Value: This function does not return any value.

Below programs illustrate the CachingIterator::rewind() function in PHP:



Program 1:




<?php 
  
// Declare an ArrayIterator 
$arr = new ArrayIterator( 
    array
        "a" => 4, 
        "b" => 2, 
        "g" => 8, 
        "d" => 6, 
        "e" => 1, 
        "f" => 9 
    
); 
  
// Create a new CachingIterator
$cachIt = new CachingIterator(
    new ArrayIterator($arr), 
    CachingIterator::FULL_CACHE
);
  
// Move to last position 
$cachIt->seek(5); 
  
// Display the next value 
var_dump($cachIt->next()); 
  
// Move to start position 
$cachIt->rewind(); 
  
// Display the current element 
echo $cachIt->current(); 
  
?>
Output:
NULL
4

Program 2:




<?php 
      
// Declare an ArrayIterator 
$arr = new ArrayIterator( 
    array
        "b" => "for"
        "a" => "Geeks"
        "e" => "Science"
        "c" => "Geeks"
        "f" => "Portal"
        "d" => "Computer"
    
); 
  
// Create a new CachingIterator
$cachIt = new CachingIterator(
    new ArrayIterator($arr), 
    CachingIterator::FULL_CACHE
);
      
// Check the validity of ArrayIterator 
while($cachIt->valid()) { 
    $cachIt->next(); 
  
// Move to start position 
$cachIt->rewind(); 
  
// Display the current element 
echo $cachIt->current(); 
  
?>
Output:
for

Reference: https://www.php.net/manual/en/cachingiterator.rewind.php




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