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
$arr = new ArrayIterator( array ( 'G' , 'e' , 'e' , 'k' , 's' ));
$itr = new AppendIterator;
$itr ->append( $arr );
while ( $itr ->valid()) {
echo $itr ->current();
$itr ->next();
}
?>
|
Program 2:
<?php
$arr1 = new ArrayIterator( array ( "Geeks" , "for" , "Geeks" ));
$arr2 = new ArrayIterator( array ( "Computer" , "Science" , "Portal" ));
$itr = new AppendIterator;
$itr ->append( $arr1 );
$itr ->append( $arr2 );
$itr -> rewind ();
while ( $itr ->valid()) {
var_dump( $itr ->current());
$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
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