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:

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<?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]);
  
?>

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Output:

string(13) "GeeksforGeeks"

Program 2:

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<?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]);
  
?>

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Output:

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

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



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