PHP | SplObjectStorage attach() Function

The SplObjectStorage::attach() function is an inbuilt function in PHP which is used to add objects into the SplObjectStorage.

Syntax:

void SplObjectStorage::attach($obj, $val)

Parameters: This function accepts two parameters as mention above and described below.

$obj: This is required parameter which specifies the object of the storage class.
$val: This is an optional parameter which specified the values to be added.

Return Value: This function does not returns any value.

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

Program 1:

<?php 
  
// Declare new object 
$obj = new StdClass; 
  
// Create an empty storage class 
$str = new SplObjectStorage(); 
  
// Attach $obj with String "GeeksforGeeks" 
$str->attach($obj, "GeeksforGeeks"); 
  
// Print Result  
var_dump($str[$obj]); 
  
?> 

Output:

string(13) "GeeksforGeeks"

Program 2:

<?php 
  
// Creating std classes 
$obj1 = new StdClass; 
$obj2 = new StdClass; 
$obj3 = new StdClass; 
$obj4 = new StdClass; 
  
$str = new SplObjectStorage(); 
$str->attach($obj1); 
$str->attach($obj2, "GFG"); 
  
// Another way to use attach() function 
$str[$obj3] = "GeeksforGeeks"; 
$str[$obj4] = NULL ; 
  
// Print Result 
var_dump($str[$obj1]); 
var_dump($str[$obj2]); 
var_dump($str[$obj3]); 
var_dump($str[$obj4]); 
  
?> 

Output:

NULL
string(3) "GFG"
string(13) "GeeksforGeeks"
NULL

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

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