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  • SimpleXMLIterator::key()

    (PHP 5, PHP 7)

    Return current key

    说明

    publicSimpleXMLIterator::key(void): mixed

    This method gets the XML tag name of the current element.

    参数

    此函数没有参数。

    返回值

    Returns the XML tag name of the element referenced by the current SimpleXMLIterator object or FALSE

    范例

    Example #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"
    
    <?php 
    $note=<<<XML
    <note>
    <to>Tove</to>
    <from>Jani</from>
    <heading>Reminder</heading>
    <body>Don't forget me this weekend!</body>
    </note>
    XML;
    $xmlIterator = new SimpleXMLIterator($note);
    for( $xmlIterator->rewind(); $xmlIterator->valid(); $xmlIterator->next() ) {
       echo "<pre>";
       echo var_dump($xmlIterator->key());
    }
    ?>
    out put :
    string(2) "to"
    string(4) "from"
    string(7) "heading"
    string(4) "body"