DOM getElementsByTagName 并创建一个关联数组

Question

我正在尝试读取一些 html，然后根据 'ul li span' 和 'ul li strong' 的结果创建一个关联数组。跨度将包含第一个值和第二个值。当我尝试这个时，我得到错误

Trying to get property of non-object

我的 php 是

// Start the process of stripping the elements and putting in an assocative array 
libxml_use_internal_errors(true);

$dom = new DOMDocument();
$dom->loadHTML($result);


$results = array();  

 // Get all li elements on the page
foreach ($dom->getElementsByTagName('ul') as $ul) {        
    $results[$ul->getElementsByTagName('span')->item(0)->textContent]=$ul->getElementsByTagName('strong')->item(1)->textContent;
}

html 看起来如下

<ul class="ul-data">

    <li>
        <span>Vehicle make </span>
        <strong>AUDI</strong>
    </li>


    <li id="date">
        <span>Date of first registration </span>
        <strong>31 March 2005</strong>
    </li>a

    <li>
        <span>Year of manufacture </span>
        <strong>1999</strong>
    </li>

    <li id="cc">
        <span>Cylinder capacity (cc) </span>
        <strong>2993 cc</strong>
    </li>

    <li>
        <span>CO₂Emissions </span>
        <strong id="CO2EmissionShown">142 g/km</strong>
    </li>

    <li id="fuel">
        <span>Fuel type </span>
        <strong id="FuelTypeShown">DIESEL</strong>
    </li>

    <li>
        <span>Export marker </span>
        <strong>No</strong>
    </li>
    <li>
        <span>Vehicle status </span>
        <strong>Tax not due</strong>
    </li>
    <li>
        <span>Vehicle colour </span>
        <strong>GREY</strong>
    </li>
    <li>
        <span>Vehicle type approval </span>
        <strong>M1</strong>
    </li>

    <li>
        <span>Wheelplan </span>
        <strong>2 AXLE RIGID BODY</strong>
    </li>

    <li>
        <span>Revenue weight </span>
        <strong>Not available</strong>
    </li>

</ul>

如您所见，span 是标题，strong 是值。在 Jquery 我可以做 $('ul span');和 $('ul strong');我是否正确地循环 li 然后选择它们？我知道这是错误的，但我不确定在尝试其他方法（例如分别获取两者）后如何处理，但我不确定如何使用 DOM.

Answer 1

只有一个 <ul>，您要查找的 <strong> 是 item(0)。

foreach ($dom->getElementsByTagName('li') as $li) {
    $key = $li->getElementsByTagName('span')->item(0)->textContent;
    $value = $li->getElementsByTagName('strong')->item(0)->textContent;
    $results[trim($key)] = trim($value);
}

Answer 2

在你的循环中，你应该检查 li 而不是 ul。

// Get all li elements on the page
foreach ($dom->getElementsByTagName('li') as $li) {        
    $results[$li->getElementsByTagName('span')->item(0)->textContent]=$li->getElementsByTagName('strong')->item(0)->textContent;
}

DOM getElementsByTagName 并创建一个关联数组

DOM getElementsByTagName and make an associative array

php

arrays

dom

associative-array