PHP | ArrayIterator key() Function

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The ArrayIterator::key() function is an inbuilt function in PHP which returns the current key of the array element.

Syntax:

mixed ArrayIterator::key( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns the current array key.

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

Program 1:

<?php 
   
// Declare an ArrayIterator 
$arrItr = new ArrayIterator( 
    array('G', 'e', 'e', 'k', 's', 'f', 'o', 'r') 
); 
  
// Loop to display the array iterator key 
foreach($arrItr as $element) { 
    echo $arrItr->key() . "\n"; 
} 
   
?> 

Output:

Program 2:

<?php 
   
// Declare an ArrayIterator 
$arrItr = new ArrayIterator( 
    array( 
        "a" => "Geeks", 
        "b" => "for", 
        "c" => "Geeks"
    ) 
); 
   
// Append the element into array iterator 
$arrItr->append("Computer"); 
$arrItr->append("Science"); 
$arrItr->append("Portal"); 
  
// Display the key and its value of 
// array iterator 
foreach($arrItr as $element) { 
    echo "key: " . $arrItr->key() . "  Value: "
            . $arrItr->current() . "\n"; 
} 
  
?> 

Output:

key: a  Value: Geeks
key: b  Value: for
key: c  Value: Geeks
key: 0  Value: Computer
key: 1  Value: Science
key: 2  Value: Portal

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

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