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PHP CachingIterator key () function

Syntax:
scalar CachingIterator::key (void)
Parameters:this function takes no parameters.Return value:this function returns the key value of the current element.The following programs illustrate the function CachingIterator::key() in PHP:Program 1:  
// Declare the array $arr = array ( ’G’ , ’ e’ , ’ e’ , ’k’ , ’ s’ );  
// Create a new CachingIterator $cachIt = new CachingIterator ( new ArrayIterator ( $arr ), CachingIterator::FULL_CACHE ); foreach ( $cachIt as $element ) { echo $cachIt -> key(). "" ; }  
?>
Exit:
0 1 2 3 4
Program 2:  
// Declare ArrayIterator $arr = array ( "a" = > " Geeks " , "b" = > "for" , "c" = > "Geeks" , "d" = > "Computer" , "e" = > "Science" , "f" = > "Portal");  
// Create a new CachingIterator $cachIt = new CachingIterator ( new ArrayIterator ( $arr ), CachingIterator::FULL_CACHE ); foreach ( $cachIt as $element ) { echo " key: " . $cachIt -> key(). " Value:" . $cachIt -> current(). "" ; }  
?>
Exit:
key: a Value: Geeks key: b Value: for key: c Value: Geeks key: d Value: Computer key: e Value: Science key: f Value: Portal
Link: https://www.php.net/manual/en/cachingiterator.key.php

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