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[$obj4] = NULL ; // Print Resultvar_dump($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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