(PHP 5, PHP 7)
ArrayIterator::key — Return current array key
public ArrayIterator::key ( ) : mixed
This function returns the current array key
This function has no parameters.
The current array key.
Example #1 ArrayIterator::key() example
<?php
$array = array('key' => 'value');
$arrayobject = new ArrayObject($array);
$iterator = $arrayobject->getIterator();
echo $iterator->key(); //key
?>
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https://www.php.net/manual/en/arrayiterator.key.php