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:
0 1 2 3 4 5 6 7
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