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PHP SplObjectStorage key () function

Syntax:
int SplObjectStorage::key()
Parameters:this the function takes no parameters.Return value:this function returns the index that the iterator is currently pointing to.The following programs illustrate the function SplObjectStorage::key()in PHP:Program 1: < ? php  
// Create empty SplObjectStorage $str = new SplObjectStorage(); $obj = new StdClass; $str -> attach ( $obj , " d1 " ); $str -> rewind ();  
// Get the current index $index  = $str -> key();  
// Print the result var_dump ( $index ); ?>
Exit:
int (0 )
Program 2:  
// Create empty SplObjectStorage $str = new SplObjectStorage(); $obj1 = new StdClass; $obj2 = new StdClass; $obj3 = new StdClass; $obj4 = new StdClass; $str -> attach ( $obj1 , " GeksforGeeks " ); $str -> attach ( $obj2 , "GFG" ); $str -> attach ( $obj3 ); $str -> attach ( $obj4 , "DSA" ); $str -> rewind ();  
// Iterate and print data for each index while ( $str -> valid()) { // Get index $index  = $str -> key(); $object = $str -> current(); $data  = $str -> getInfo(); var_dump ( $index , $data ); $str -> next(); }
?>
Exit:
int (0 ) string (12) "GeksforGeeks" int (1) string (3) "GFG" int (2) NULL int (3) string (3) "DSA"
Link: https://www.php.net/manual/en/splobjectstorage.key.php

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