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PHP ArrayIterator () function

Syntax:
mixed ArrayIterator::key (void)
Parameters:this function takes no parameters.Return value:this function returns the current key of the array.The following programs illustrate the ArrayIterator function::key() in PHP:Program 1:  
// Declare 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(). "" ; }  
?>
Exit:
0 1 2 3 4 5 6 7
Program 2:  
// Declare ArrayIterator $arrItr = new ArrayIterator ( array ( "a" = > " Geeks " , "b" = > "for" , "c" = > "Geeks" ));  
// Add an item to the iterator array $arrItr -> append ( "Computer" ); $arrItr -> append ( "Science" ); $arrItr -> append ( "Portal" );  
// Show the key and its value // array iterator foreach ( $arrItr as $element ) { echo "key:" . $arrItr -> key(). " Value:" . $arrItr -> current(). "" ; }  
?>
Exit:
key: a Value: Geeks key: b Value: for key: c Value: Geeks key: 0 Value: Computer key: 1 Value: Science key: 2 Value: Portal
Link: https://www.php.net/manual/en/arrayiterator.key.php

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