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PHP SplObjectStorage attach() Function

Last Updated : 23 Jun, 2023
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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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