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PHP | ArrayIterator offsetExists() Function
  • Last Updated : 21 Nov, 2019

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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