PHP | ArrayIterator offsetExists() Function

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The ArrayIterator::offsetExists() function is an inbuilt function in PHP which is used to check the existence of offset at the given index.

Syntax:

bool ArrayIterator::offsetExists( mixed $index )

Parameters: This function accepts single parameter $index which holds the index value to check the existence of offset.

Return Value: This function returns TRUE if the offset exists, otherwise returns FALSE.

Below programs illustrate the ArrayIterator::offsetExists() function in PHP:

Program 1:

<?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"));  
  
// Check the existence of offset 
var_dump($arrItr->offsetExists("a")); 
  
// Unset the offset value 
var_dump($arrItr->offsetUnset("a")); 
    
// Check the existence of offset 
var_dump($arrItr->offsetExists("a")); 
  
?> 

Output:

int(4)
bool(true)
NULL
bool(false)

Program 2:

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

Output:

Geeks
bool(true)
NULL
bool(false)
for
bool(true)
NULL
bool(false)

Reference: https://www.php.net/manual/en/arrayiterator.offsetexists.php

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