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(PHP 5, PHP 7, PHP 8)
SimpleXMLIterator::key — Return current key
此函数没有参数。
Returns the XML tag name of the element referenced by the current SimpleXMLIterator object or false
示例 #1 Get the current XML tag key
<?php
$xmlIterator = new SimpleXMLIterator('<books><book>PHP basics</book><book>XML basics</book></books>');
echo var_dump($xmlIterator->key());
$xmlIterator->rewind(); // rewind to the first element
echo var_dump($xmlIterator->key());
?>
以上例程会输出：
bool(false) string(4) "book"
