PHP | SplObjectStorage unserialize() Function

The SplObjectStorage::unserialize() function is an inbuilt function in PHP which is used to unserialize the storage from its serialize string representation.

Syntax:

void SplObjectStorage::unserialize( $serilize )

Parameters: This function accepts a single parameter $serialize which specifies the string serialization of the storage.

Return Value: This function does not return any value.

Below programs illustrate the SplObjectStorage::unserialize() function in PHP:

Program 1:

<?php 
  
$obj1 = new StdClass; 
  
// Create an empty SplObjectStorage 
$gfg1 = new SplObjectStorage(); 
$gfg1[$obj1] = "Geeks"; 
  
// Use unserialize() function 
$gfg1->unserialize($gfg1->serialize()); 
print_r($gfg1); 
  
?> 

Output:

SplObjectStorage Object
(
    [storage:SplObjectStorage:private] => Array
        (
            [00000000494fcd4d000000001f544823] => Array
                (
                    [obj] => stdClass Object
                        (
                        )

                    [inf] => Geeks
                )

            [00000000494fcd4f000000001f544823] => Array
                (
                    [obj] => stdClass Object
                        (
                        )

                    [inf] => Geeks
                )

        )

)

Program 2:

<?php 
  
$obj1 = new StdClass; 
$obj2 = new StdClass; 
  
// Create an empty SplObjectStorage 
$gfg1 = new SplObjectStorage(); 
$gfg1[$obj1] = "Geeks"; 
  
// Create an empty SplObjectStorage 
$gfg2 = new SplObjectStorage(); 
$gfg2[$obj1] = "GFG"; 
$gfg2[$obj2] = "GeeksClasses"; 
  
// Use unserialize() function 
$gfg1->unserialize($gfg2->serialize()); 
var_dump(count($gfg1)); 
  
// Use unserialize() function 
$gfg2->unserialize($gfg1->serialize()); 
var_dump(count($gfg2)); 
?> 

Output:

int(3)
int(5)

Reference: https://www.php.net/manual/en/splobjectstorage.unserialize.php

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