PHP | AppendIterator valid() Function

PHP | AppendIterator valid() Function

Last Updated : 21 Nov, 2019

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

<?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

<?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

PHP | AppendIterator valid() Function

jit_t

Improve

Article Tags :

Similar Reads

PHP | AppendIterator rewind() Function

The AppendIterator::rewind() function is an inbuilt function in PHP which is used to rewind to the first element of the first inner Iterator. Syntax: void AppendIterator::rewind( void ) Parameters: This function does not accept any parameters. Return Value: This function does not return any value. B

PHP | ArrayIterator valid() Function

The ArrayIterator::valid() function is an inbuilt function in PHP which is used to check whether an array contains more entries or not. Syntax: bool ArrayIterator::valid( void ) Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the iterator is vali

PHP | AppendIterator key() Function

The AppendIterator::key() function is an inbuilt function in PHP which is used to return the current key. Syntax: scalar AppendIterator::key( void ) Parameters: This function does not accept any parameters. Return Value: This function returns the current key if it is valid or NULL otherwise. Below p

PHP | AppendIterator next() Function

The AppendIterator::next() function is an inbuilt function in PHP which is used to move the element into the next element. Syntax: void AppendIterator::next( void ) Parameters: This function does not accept any parameters. Return Value: This function does not return any value. Below programs illustr

PHP | ArrayIterator append() Function

The ArrayIterator::append() function is an inbuilt function in PHP which is used to append an element into an array iterator. Syntax: void ArrayIterator::append( mixed $value ) Parameters: This function accepts single parameter $value that holds the value that need to be append. Return Value: This f

PHP | AppendIterator append() Function

The AppendIterator::append() function is an inbuilt function in PHP which is used to append an iterator. Syntax: void AppendIterator::append( Iterator $iterator ) Parameters: This function accepts single parameter $iterator which holds the iterator to append. Return Value: This function does not ret

PHP | DirectoryIterator valid() Function

The DirectoryIterator::valid() function is an inbuilt function in PHP which is used to check the current DirectoryIterator position is a valid file or not. Syntax: bool DirectoryIterator::valid( void ) Parameters: This function does not accept any parameters. Return Value: This function returns TRUE

PHP | AppendIterator current() Function

The AppendIterator::current() function is an inbuilt function in PHP which is used to get the current value. Syntax: mixed AppendIterator::current( void ) Parameters: This function does not accept any parameters. Return Value: This function returns the current value if it is valid or NULL otherwise.

PHP | AppendIterator __construct() Function

The AppendIterator::__construct() function is an inbuilt function in PHP which is used to construct an AppendIterator. Syntax: public AppendIterator::__construct( void ) Parameters: This function does not accept any parameters. Return Value: This function does not return any value. Below programs il

PHP | ArrayIterator rewind() Function

The ArrayIterator::rewind() function is an inbuilt function in PHP which is used to rewind the array back to the start. Syntax: void ArrayIterator::rewind( void ) Parameters: This function does not accept any parameters. Return Value: This function does not return any value. Below programs illustrat