PHP SplObjectStorage serialize() Function

The SplObjectStorage::serialize() function is an inbuilt function in PHP which is used to serialize the result of the storage.

Syntax:

string SplObjectStorage::serialize()

Parameters: This function does not accept any parameter.

Return Value: This function returns a string which is the representation of the storage.

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

Program 1:

<?php

// Create new storage class
$str = new SplObjectStorage;
$obj = new StdClass;

$str->attach($obj, "GeeksforGeeks");

// Print serialize result
echo $str->serialize();
?>

Output:

x:i:1;O:8:"stdClass":0:{}, s:13:"GeeksforGeeks";;m:a:0:{}

Program 2:

<?php

$obj1 = new StdClass;
$obj2 = new StdClass;

// Create new storage class
$gfg1 = new SplObjectStorage();
$gfg1[$obj1] = "Geeks";

// Create new storage class
$gfg2 = new SplObjectStorage();
$gfg2[$obj1] = "GFG";
$gfg2[$obj2] = "GeeksClasses";

print_r( $gfg1->serialize(). "\n");
echo( $gfg2->serialize()."\n");

?>

Output:

x:i:1;O:8:"stdClass":0:{}, s:5:"Geeks";;m:a:0:{}
x:i:2;O:8:"stdClass":0:{}, s:3:"GFG";;O:8:"stdClass":0:{}, s:12:"GeeksClasses";;m:a:0:{}

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