ArrayObject offsetUnset() Function in PHP

The offsetUnset() function of the ArrayObject class in PHP is used to unset the value preset at a specific index. In other words, it is used to remove a value present at a specific index in the ArrayObject.

Syntax:

void offsetUnset($index) 

Parameters: This function accepts a single parameter $index which is the index whose value is to be unset.

Return Value: This function does not returns any value.

Below programs illustrate the above function:

Program 1:

<?php
// PHP program to illustrate the
// offsetUnset() function

$arr = array("Welcome"=>"1", "to" => "2", "GfG" => "3");

// Create array object
$arrObject = new ArrayObject($arr);

// Unset the value at index "to"
$arrObject->offsetUnset("to");

// Print the updated ArrayObject
print_r($arrObject);

?>

Output:

ArrayObject Object
(
    [storage:ArrayObject:private] => Array
        (
            [Welcome] => 1
            [GfG] => 3
        )

)

Program 2:

<?php
// PHP program to illustrate the
// offsetUnset() function

$arr = array("geeks100", "geeks99", "geeks1", "geeks02");

// Create array object
$arrObject = new ArrayObject($arr);

// Unset the value at index 1
$arrObject->offsetUnset(1);

// Unset the value at index 1
$arrObject->offsetUnset(2);

// Print the updated ArrayObject
print_r($arrObject);

?>

Output:

ArrayObject Object
(
    [storage:ArrayObject:private] => Array
        (
            [0] => geeks100
            [3] => geeks02
        )

)

Reference: http://php.net/manual/en/arrayobject.offsetunset.php