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PHP | SplDoublyLinkedList unserialize() Function

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The SplDoublyLinkedList::unserialize() function is an inbuilt function in PHP which is used to unserialize the storage of SplDoublyLinkedList::serialize() function. Syntax:
void SplDoublyLinkedList::unserialize( string $serialized )
Parameters: This function accepts single parameter $serialized which holds the serialized string. Return Value: This function does not return any value. Below programs illustrate the SplDoublyLinkedList::unserialize() function in PHP: Program 1:
<?php
   
// Declare an empty SplDoublyLinkedList 
$list = new SplDoublyLinkedList();
   
// Use SplDoublyLinkedList::push() function to  
// add elements to the SplDoublyLinkedList 
$list->push(1); 
$list->push(2); 
$list->push(3); 
$list->push(8); 
$list->push(5); 
   
// Use SplDoublyLinkedList::serialize() function
// to serialize the object
$serialize = serialize($list);
  
echo $serialize . "\n";
  
// Use SplDoublyLinkedList::unserialize() function
// to unserialize the object
$unserialze = unserialize($serialize);
  
print_r($unserialze);
  
?>

                    
Output:
C:19:"SplDoublyLinkedList":29:{i:0;:i:1;:i:2;:i:3;:i:8;:i:5;}
SplDoublyLinkedList Object
(
    [flags:SplDoublyLinkedList:private] => 0
    [dllist:SplDoublyLinkedList:private] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 8
            [4] => 5
        )

)
Program 2:
<?php
   
// Declare an empty SplDoublyLinkedList 
$list = new SplDoublyLinkedList();
   
// Use SplDoublyLinkedList::add() function
// to add the element into the list
$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'); 
   
// Use SplDoublyLinkedList::serialize() function
// to serialize the object
$serialize = serialize($list);
  
echo $serialize . "\n";
  
// Use SplDoublyLinkedList::unserialize() function
// to unserialize the object
$unserialze = unserialize($serialize);
  
print_r($unserialze);
  
?>

                    
Output:
C:19:”SplDoublyLinkedList”:105:{i:0;:s:7:”Welcome”;:s:2:”to”;:s:13:”GeeksforGeeks”;:s:1:”A”;:s:8:”Computer”;:s:7:”Science”;:s:6:”Portal”;} SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => Welcome [1] => to [2] => GeeksforGeeks [3] => A [4] => Computer [5] => Science [6] => Portal ) )
Reference: https://www.php.net/manual/en/spldoublylinkedlist.unserialize.php

Last Updated : 21 Nov, 2019
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