获取Url匹配遍历xml simplexml_load_file

    <theme name="front">
        <layouts url="/administrator" tpl="default.html" >
            <templates>
                <login url="/login" tpl="login.html"></login>
                <dashboard url="/" tpl="dashboard.html"></dashboard>
                <contact url="/contacts" tpl="contact.html" >
                    <templates>
                        <add url="/add"></add>
                        <edit url="/modify" ></edit>
                        <remove url="/remove" ></remove>
                        <bulk_view url="/bulk-view"></bulk_view>
                    </templates>
                </contact>
                <help url="/help" tpl="content.html"></help>
                <settings url="/settings" tpl="content.html"></settings>
            </templates>
        </layouts>
    </theme>

最好通过查询文档来查找要查找的信息。对于XML，最好使用Xpath。

例如，如果您想获得所有具有url属性的元素，查询是:

//*[@url]

如果您现在考虑在文档中任何此类元素的，您可以在ancestor-or-self xpath-axis:

上以文档顺序检索所有url属性。

ancestor-or-self::*/@url

到目前为止，这只是针对裸xpath查询。当使用PHP的XML库(这里是示例性的SimpleXML)

包装在PHP代码中时，就会出现这种情况。

<?php
/**
 * Get Url match traversing xml simplexml_load_file (Example #1)
 *
 * @link http://stackoverflow.com/q/31848077/367456
 */
$string = <<<XML
<theme name="front">
    <layouts url="/administrator" tpl="default.html">
        <templates>
            <login url="/login" tpl="login.html"></login>
            <dashboard url="/" tpl="dashboard.html"></dashboard>
            <contact url="/contacts" tpl="contact.html">
                <templates>
                    <add url="/add"></add>
                    <edit url="/modify"></edit>
                    <remove url="/remove"></remove>
                    <bulk_view url="/bulk-view"></bulk_view>
                </templates>
            </contact>
            <help url="/help" tpl="content.html"></help>
            <settings url="/settings" tpl="content.html"></settings>
        </templates>
    </layouts>
</theme>
XML;
$xml = simplexml_load_string($string);
foreach ($xml->xpath('//*[@url]') as $urlElement) {
    echo implode("", $urlElement->xpath('ancestor-or-self::*/@url')), "'n";
}

结果是(也是:online demo):

/administrator
/administrator/login
/administrator/
/administrator/contacts
/administrator/contacts/add
/administrator/contacts/modify
/administrator/contacts/remove
/administrator/contacts/bulk-view
/administrator/help
/administrator/settings

要匹配这些url中的任何一个，您需要查看它是否是您要查找的url:

$search = '/administrator/contacts/add';
foreach ($xml->xpath('//*[@url]') as $urlElement) {
    $url = implode("", $urlElement->xpath('ancestor-or-self::*/@url'));
    if ($url !== $search) {
        continue;
    }
    // found!
    $urlElement->asXML('php://output');
    break;
}

输出第一个匹配的元素:

<add url="/add"/>