如何对wp_list_ages的结果执行str_place

我试图定位并替换函数生成的文本。我不太确定我做错了什么。

$InnerPages = wp_list_pages(\'child_of=\'.($post->post_parent != false ? $post->post_parent : $post->ID).\'&title_li=&echo=0\');
echo $InnerPages;

输出：

<ul>
    <li>1</li>
    <li>2
        <ul class="children">
            <li>2.1</li>
        </ul>
   </li>
</ul>

我想修改<ul class="children"> 因此，我尝试执行str\\u替换：

$InnerPages = wp_list_pages(\'child_of=\'.($post->post_parent != false ? $post->post_parent : $post->ID).\'&title_li=&echo=0\')
$InnerPages = str_replace(\'<ul class="children">\',
                          \'<ul class="children"><li>Overview</li>\',
                          $InnerPages);
echo $InnerPages;

但这没什么作用，我对PHP还不熟悉，所以我不确定我做错了什么。

EDIT

我修改了代码，以反映出在一些故障排除之后迄今为止所做的更改（见下文）。代码仍然不起作用。

$InnerPages = wp_list_pages(\'child_of=\'.($post->post_parent != false ? $post->post_parent : $post->ID).\'&title_li=&echo=0\'); $InnerPages = str_replace(\'<ul class="children">\', \'<ul class="children"><li>Overview</li>\', $InnerPages); echo $InnerPages;

<li class="page_item page-item-113 page_item_has_children current_page_item"><a href="http://127.0.0.1/abbatech/procurement-capabilities/los-alamos-national-laboratory/">Los Alamos National Laboratory</a> <ul class="children"> <li class="page_item page-item-115"><a href="http://127.0.0.1/abbatech/procurement-capabilities/los-alamos-national-laboratory/online-contact-form/">Online Contact Form</a></li> </ul> </li> <li class="page_item page-item-95"><a href="http://127.0.0.1/abbatech/procurement-capabilities/nasa-sewp-v/">NASA SEWP V</a></li> <li class="page_item page-item-2"><a href="http://127.0.0.1/abbatech/procurement-capabilities/sample-page/">Sample Page</a></li>

$InnerPages = \' <li class="page_item page-item-113 page_item_has_children current_page_item"><a href="http://127.0.0.1/abbatech/procurement-capabilities/los-alamos-national-laboratory/">Los Alamos National Laboratory</a> <ul class="children"> <li class="page_item page-item-115"><a href="http://127.0.0.1/abbatech/procurement-capabilities/los-alamos-national-laboratory/online-contact-form/">Online Contact Form</a></li> </ul> </li> <li class="page_item page-item-95"><a href="http://127.0.0.1/abbatech/procurement-capabilities/nasa-sewp-v/">NASA SEWP V</a></li> <li class="page_item page-item-2"><a href="http://127.0.0.1/abbatech/procurement-capabilities/sample-page/">Sample Page</a></li> \'; $InnerPages = str_replace(\'<ul class="children">\', \'<ul class="children"><li>Overview</li>\', $InnerPages); echo $InnerPages;

<li class="page_item page-item-113 page_item_has_children current_page_item"><a href="http://127.0.0.1/abbatech/procurement-capabilities/los-alamos-national-laboratory/">Los Alamos National Laboratory</a> <ul class="children"><li>Overview</li> <li class="page_item page-item-115"><a href="http://127.0.0.1/abbatech/procurement-capabilities/los-alamos-national-laboratory/online-contact-form/">Online Contact Form</a></li> </ul> </li> <li class="page_item page-item-95"><a href="http://127.0.0.1/abbatech/procurement-capabilities/nasa-sewp-v/">NASA SEWP V</a></li> <li class="page_item page-item-2"><a href="http://127.0.0.1/abbatech/procurement-capabilities/sample-page/">Sample Page</a></li>

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