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PHP AppendIterator valid () Function

Syntax:
bool AppendIterator::valid (void)
Parameters:This function takes no parameters.Return Value:This function returns TRUE if the current iteration is valid, FALSE otherwise. The following programs illustrate the AppendIterator::valid() function in PHP:Program 1:  
// Declare ArrayIterator $arr = new ArrayIterator ( array ( ’G’ , ’e’ , ’ e’ , ’k’ , ’s’ ));  
// Create a new AppendIterator $itr = new AppendIterator; $itr -> append ( $arr );  
// Validate and display
// result while ( $itr -> valid()) { echo $itr -> current(); $itr -> next(); }  
?>
Exit:
Geeks
Program 2:  
// Declare 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 the rewind function $itr -> rewind ();  
// Validate and display the result while ( $itr -> valid()) { var_dump ( $itr -> current()); // Move to next element $itr -> next(); }  
?>
Exit:
string (5 ) "Geeks" string (3) "for" string (5) "Geeks" string (8) "Computer" string (7) "Science" string (6) "Portal"
Link : https://www.php.net/manual/en/appenditerator .valid.php

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