PHP | AppendIterator valid() Function

0 0 1 minute read

The AppendIterator::valid() function is an inbuilt function in PHP which is used to check the validity of the current element.

Syntax:

bool AppendIterator::valid( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns TRUE if the current iteration is valid and FALSE otherwise.

Below programs illustrate the AppendIterator::valid() function in PHP:

Program 1:

<?php 
   
// Declare an ArrayIterator 
$arr = new ArrayIterator(array('G', 'e', 'e', 'k', 's')); 
   
// Create a new AppendIterator 
$itr = new AppendIterator; 
$itr->append($arr); 
   
// Check the validity and display 
// the result 
while($itr->valid()) { 
    echo $itr->current(); 
    $itr->next(); 
} 
   
?> 

Output:

Geeks

Program 2:

<?php 
    
// Declare an ArrayIterator 
$arr1 = new ArrayIterator(array("Geeks", "for", "Geeks")); 
$arr2 = new ArrayIterator(array("Computer", "Science", "Portal")); 
   
// Create a new AppendIterator 
$itr = new AppendIterator; 
$itr->append($arr1); 
$itr->append($arr2); 
   
// Using rewind function  
$itr->rewind();  
   
// Check the validity and display the result 
while($itr->valid()) {  
    var_dump($itr->current());  
         
    // Moving to next element  
    $itr->next();  
}  
    
?> 

Output:

string(5) "Geeks"
string(3) "for"
string(5) "Geeks"
string(8) "Computer"
string(7) "Science"
string(6) "Portal"

Reference: https://www.php.net/manual/en/appenditerator.valid.php

Whether you’re preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, zambiatek Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we’ve already empowered, and we’re here to do the same for you. Don’t miss out – check it out now!