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PHP SplDoublyLinkedList offsetExists () function

Syntax:
bool SplDoublyLinkedList::offsetExists ($index)
Parameters: This function takes one parameter, $index,which contains the index value to check.Return Value:Returns True if the given index exists, otherwise returns False.The following programs illustrate the function SplDoublyLinkedList::offsetExists()in PHP:Program 1:  
// Declare an empty SplDoublyLinkedList $list = new SplDoublyLinkedList;  
// Use the SplDoublyLinkedList::add() function for
// add elements to SplDoublyLinkedList $list -> add (0, 30); $list -> add (1, 20); $list -> add (2, 30); $list -> add (3, " Geeks " ); $list -> add (4, ’ G’ ); $list -> rewind ();  
// Use the SplDoublyLinkedList::offsetExists() function
// check if the index exists or not var_dump ( $list -> offsetExists (2)); var_dump ( $list -> offsetExists (10));  
?>
Exit:
bool (true ) bool (false)
Program 2:  
// Declare an empty SplDoublyLinkedList $list = new SplDoublyLinkedList();  
// Use the SplDoublyLinkedList::push() function for
// add elements to SplDoublyLinkedList $list -> push (1); $list -> push (2); $list -> push (3); $list -> push (8); $list -> push (5);  
// Use the SplDoublyLinkedList::offsetExists() function
// check if the index exists or not var_dump ( $list -> offsetExists (3)); var_dump ( $list -> offsetExists (15));  
?>
Exit:
bool (true ) bool (false)
Link: https://www .php.net / manual / en / spldoublylinkedlist.offsetexists.php

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