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