The SplObjectStorage::key() function is an inbuilt function in PHP which is used to get the index of the currently pointing iterator. Syntax:
int SplObjectStorage::key()
Parameters: This function does not accept any parameter. Return Value: This function returns the index at which the iterator currently pointing. Below programs illustrate the SplObjectStorage::key() function in PHP: Program 1:
php
<?php // Create an empty SplObjectStorage $str = new SplObjectStorage(); $obj = new StdClass; $str->attach($obj, "d1"); $str->rewind(); // Get current index $index = $str->key(); // Print Result var_dump($index); ?> |
Output:
int(0)
Program 2:
php
<?php // Create an Empty SplObjectStorage $str = new SplObjectStorage(); $obj1 = new StdClass; $obj2 = new StdClass; $obj3 = new StdClass; $obj4 = new StdClass; $str->attach($obj1, "neveropen"); $str->attach($obj2, "GFG"); $str->attach($obj3); $str->attach($obj4, "DSA"); $str->rewind(); // Iterate and print data on each index while($str->valid()) { // Get index $index = $str->key(); $object = $str->current(); $data = $str->getInfo(); var_dump($index, $data); $str->next(); } ?> |
Output:
int(0) string(12) "GeksforGeeks" int(1) string(3) "GFG" int(2) NULL int(3) string(3) "DSA"
Reference: https://www.php.net/manual/en/splobjectstorage.key.php
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