PHP SplObjectStorage detach() Function

The SplObjectStorage::detach() function is an inbuilt function in PHP which is used to remove objects from the storage.

Syntax:

void SplObjectStorage::detach($obj)

Parameters: This function accepts a single parameter $obj which specifies the object to be remove from the storage.

Return Value: This function does not return any value.

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

Program 1:

<?php

// Creating class
$obj = new StdClass;

// Create an empty storage class
$str = new SplObjectStorage();

// Add some object
$str->attach($obj, "GeeksforGeeks");

// Print result before detaching
var_dump(count($str));

// Detaching object
$str->detach($obj);

// Print result after detach
var_dump(count($str));
?>

Output:

int(1)
int(0)

Program 2:

<?php

// Creating class
$obj1 = new StdClass;
$obj2 = new StdClass;
$obj3 = new StdClass;

// Create an empty storage class
$str = new SplObjectStorage();

// Add some object
$str->attach($obj1, "GeeksforGeeks");
$str->attach($obj2);
$str->attach($obj3, "GFG");

// Print result before detaching
var_dump(count($str));

// Detaching object
$str->detach($obj1);

// Print result after detach first object
var_dump(count($str));

// Detaching object
$str->detach($obj3);

// Print result after detach second object
var_dump(count($str));
?>

Output:

int(3)
int(2)
int(1)

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