PHP

Question

我试图在解析的网页中获取节点的内容。这是我的代码：

include('simplehtmldom_1_5/simple_html_dom.php');
// get DOM from URL or file
$feedUrl = "http://www.yellowpages.com/md/cpa-tax?menu_search=false&page=1&refinements%5Bfacet_clicked%5D=HeadingText&refinements%5Bheadingtext%5D%5B%5D=Accountants-Certified+Public&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation-Business";
$html = file_get_html($feedUrl);
$xpath = "/html/body/div[5]/div[1]/div[1]/div[1]/div[5]/div[3]/div[1]/div[1]/div[1]/div[1]/a[1]/div[1]/div[1]/div[3]/div[1]/div[2]/h3[1]/div[1]/a[1]";
foreach($html->find($xpath) as $e) 
    echo $e->title . '<br>';

在本例中，我试图从网页中获得“税务经验CPA，Inc”的名称。问题是find($xpath)返回的数组始终为空。当我打开Google并使用那个xpath搜索节点时，我能够准确地找到我想要的节点。但这在我的代码中行不通。我所使用的路径一定有问题，但我不知道它是什么。我找了又找，但都找不到我做错了什么。请帮帮忙。

Answer 1

这个网站有很多有ids和类的节点，使用它们创建一个更短、更简单的xpath表达式来检索您想要的！

以下是您的工作代码：

// includes Simple HTML DOM Parser
include "simple_html_dom.php";

$feedUrl = "http://www.yellowpages.com/md/cpa-tax?menu_search=false&page=1&refinements%5Bfacet_clicked%5D=HeadingText&refinements%5Bheadingtext%5D%5B%5D=Accountants-Certified+Public&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation-Business";

//Create a DOM object
$html = new simple_html_dom();
// Load HTML from a string
$html->load_file($feedUrl);

// Find all anchors
$anchors = $html->find("//div[@class='srp-business-name']/a");

// Display all titles
foreach($anchors as $a) 
    echo $a->title . '<br>';

输出

Tax Experience CPA Inc
Bernice Hassan CPA Accounting & Tax Services
Begosh Tax Service CPA
At-Home CPA Tax Service
CPA Financial & Tax Service
My Tax CPA
...

Working DEMO

编辑：

下面是一个修改后的代码，从每个"element/div“获取标题和电话号码。

注意，find("...", $index)返回由$index指定的一个元素(从0开始的N个元素)，如果没有设置$index，则返回一个元素数组.

$feedUrl = "http://www.yellowpages.com/md/cpa-tax?menu_search=false&page=1&refinements%5Bfacet_clicked%5D=HeadingText&refinements%5Bheadingtext%5D%5B%5D=Accountants-Certified+Public&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation-Business";

//Create a DOM object
$html = new simple_html_dom();
// Load HTML from a string
$html->load_file($feedUrl);

// Find all elements
$divs = $html->find('div.business-container-inner');

// loop through all elements and display the useful parts
foreach($divs as $div) {
    $title = $div->find('div.srp-business-name a', 0)->title;

    $phone = $div->find('span.business-phone', 0)->plaintext;

    echo $title ." - ". $phone . "<br>";
}

// Clear DOM object
$html->clear();
unset($html);

Working DEMO

Answer 2

我觉得你应该试试这个。

include('simplehtmldom_1_5/simple_html_dom.php');

// get DOM from URL or file
$feedUrl = "http://www.yellowpages.com/md/cpa-tax?menu_search=false&page=1&refinements%5Bfacet_clicked%5D=HeadingText&refinements%5Bheadingtext%5D%5B%5D=Accountants-Certified+Public&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation&refinements%5Bheadingtext%5D%5B%5D=Tax+Return+Preparation-Business";

$html = new simple_html_dom();
$html->load_file($feedUrl);
$xpath = ".srp-business-name a";
foreach($html->find($xpath) as $e) 
    echo $e->title . '<br>';