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PHP SplDoublyLinkedList __construct () function

Syntax:
public SplDoublyLinkedList::__ construct (void)
Parameters:This function takes no parameters.Return value:This function does not return any value.The programs below illustrate the function SplDoublyLinkedList::__ construct() in PHP:Program 1:  
// Declare an empty SplDoublyLinkedList $list = new SplDoublyLinkedList();  
// Insert element into SplDoublyLinkedList $list -> push (10); $list -> push (20); $list -> push (30);  
// Show SplDoublyLinkedList var_dump ( $list ); ?>
Exit:
object (SplDoublyLinkedList ) # 1 (2) {["flags": "SplDoublyLinkedList": private] = > int (0) ["dllist": "SplDoublyLinkedList": private] = > array (3) {[0] = > int (10) [1] = > int (20) [2] = > int (30)}}
Program 2:  
// Declare an empty SplDoublyLinkedList $list = new SplDoublyLinkedList();  
// Add item to SplDoublyLinkedList $list -> add (0, "Welcome" ); $list -> add (1, " to " ); $list -> add (2, " GeeksforGeeks " ); $list -> add (3, " A " ); $list -> add (4, " Computer " ); $list -> add (5, " Science " ); $list -> add (6, " Portal " );  
// Show SplDoublyLinkedList var_dump ( $list ); ?>
Exit:
object (SplDoublyLinkedList ) # 1 (2) {["flags": "SplDoublyLinkedList": private] = > int (0) ["dllist": "SplDoublyLinkedList": private] = > array (7) {[0] = > string (7) "Welcome" [1] = > string (2) "to" [2] = > string (13) "GeeksforGeeks" [3] = > string (1) "A" [4] = > string (8) "Computer" [5] = > string (7) "Science" [6] = > string (6) "Portal"}}
Link: https : //www.php.net/manual/en/spldoublylinkedlist.construct.php

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