php - Xpath访问XML标记内的属性值

Question

我试图为某些正在使用的XML提取<PersonDetails>标记中保存的日期，例如：

    <Record>
        <PersonDetails RecordDate="2017-03-31T00:00:00">
                <FirstName>Joe</FirstName>
                <Surname>Blogs</Surname>
                <Status>Active</Status>
        </PersonDetails>
    </Record>   

目前，我一直在尝试以下方法：

if (isset($XML->Record->xpath("//PersonDetails[@RecordDate]")[0])) {

$theDate = $XML->Record->xpath("//PersonDetails[@RecordDate]")[0])->textContent;

} else {

$theDate = "no date";

}

我的意图是拥有$theDate = 2017-03-31T00:00:00

Answer 1

用于选择属性节点的有效XPath表达式应如下所示：

$theDate = $XML->xpath("//Record/PersonDetails/@RecordDate")[0];

echo $theDate;   // 2017-03-31T00:00:00