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(PHP 5 >= 5.0.0)
ArrayIterator::key — Return current array key
This function returns the current array key
此函数没有参数。
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
?>