如何按類選擇特定元素標簽內的任何元素。我需要從元素“form”內部的“input”元素中檢索屬性“name”值。例如。有 2 個表單元素，名為 _arrived 和 _class。我需要從表單中檢索所有屬性名稱值_class   $source = '    <form method="post" action"arrived.php" class="_arrived">    <input type="hidden" name="type1" value="value1" autocomplete="off">    <input type="hidden" name="type2" value="value2" autocomplete="off">    <input type="hidden" name="type3" value="value3">    <input type="hidden" name="type4" value="value4">    </form>    <form method="post" action="destiny.php" class="_class">    <input type="hidden" name="type1" value="value1" autocomplete="off">    <input type="hidden" name="type2" value="value2" autocomplete="off">    <input type="hidden" name="type3" value="value3">    <input type="hidden" name="type4" value="value4">    <input type="hidden" name="type5" value="value5">    <input type="hidden" name="type6" value="value6">    <input type="hidden" name="type7" value="value8">    <input type="hidden" name="type8" value="value9">    </form>';$dom = new DOMDocument();$dom->loadHTML($source);$xpath = new DOMXpath($dom);$items = $xpath->query('//form[@class="_class"]'); $form = $items->item(0); $element = $form->getElementsByTagName("input"); foreach($element as $elemen){     foreach($elemen as $value){         echo $value->getAttribute('name').'<br>';     } }