Iterator::key
Iterator::key
(PHP 5 >= 5.0.0, PHP 7)
Iterator::key — Return the key of the current element
Description
abstract public scalar Iterator::key ( void )
Returns the key of the current element.
Parameters
This function has no parameters.
Return Values
Returns scalar on success, or NULL on failure.
Errors/Exceptions
Issues E_NOTICE on failure.
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https://secure.php.net/manual/en/iterator.key.php
