PHP | ArrayIterator offsetUnset() Function

Last Updated : 21 Nov, 2019
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The ArrayIterator::offsetUnset() function is an inbuilt function in PHP which is used to unset the value for an offset. Syntax: 
void ArrayIterator::offsetUnset( mixed $index )
Parameters: This function accepts single parameter $index which holds the index to unset the offset. Return Value: This function does not return any value. Below programs illustrate the ArrayIterator::offsetUnset() function in PHP: Program 1: php 
<?php

// Declare an ArrayIterator
$arrItr = new ArrayIterator(
    array(
        "a" => 4,
        "b" => 2,
        "g" => 8,
        "d" => 6,
        "e" => 1,
        "f" => 9
    )
);

// Display the offset value
var_dump($arrItr->offsetGet("a")); 

// Unset the offset value
var_dump($arrItr->offsetUnset("a"));
  
// Display the offset value
var_dump($arrItr->offsetGet("g")); 

// Unset the offset value
var_dump($arrItr->offsetUnset("g"));

// Display the offset value
var_dump($arrItr->offsetGet("f")); 

// Unset the offset value
var_dump($arrItr->offsetUnset("f"));

?>
Output: 
int(4)
NULL
int(8)
NULL
int(9)
NULL
Program 2: php 
<?php
   
// Declare an ArrayIterator
$arrItr = new ArrayIterator(
    array(
        "for", "Geeks", "Science",
        "Geeks", "Portal", "Computer"
    )
);

  
// Print the value at index 1 
echo $arrItr->offsetGet(1) . "\n"; 

// Unset the offset value
var_dump($arrItr->offsetUnset(1));
  
// Print the value at index 0
echo $arrItr->offsetGet(0) . "\n";

// Unset the offset value
var_dump($arrItr->offsetUnset(0));

// Print the value at index 3
echo $arrItr->offsetGet(3) . "\n"; 

// Unset the offset value
var_dump($arrItr->offsetUnset(3));

?>
Output: 
Geeks
NULL
for
NULL
Geeks
NULL
Reference: https://www.php.net/manual/en/arrayiterator.offsetunset.php

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