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, neveropen 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!
