How do I extract text data from a web page? [duplicate] - php

Question

This question already has answers here:
How do you parse and process HTML/XML in PHP?
(31 answers)
Closed 9 years ago.
Okay, so I have the following function that grabs the web page I need:
function login2($url2) {
$fp = fopen("cookie.txt", "w");
fclose($fp);
$login2 = curl_init();
curl_setopt($login2, CURLOPT_COOKIEJAR, "cookies.txt");
curl_setopt($login2, CURLOPT_COOKIEFILE, "cookies.txt");
curl_setopt($login2, CURLOPT_TIMEOUT, 40000);
curl_setopt($login2, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($login2, CURLOPT_URL, $url2);
curl_setopt($login2, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
curl_setopt($login2, CURLOPT_FOLLOWLOCATION, false);
[...]
I then issue this to use the function:
echo login2("https://example.com/clue/holes.aspx");
This echoes the page I am requesting but I only want it to echo a specific piece of data from the HTML source. Here's the specific markup:
<h4>
<label id="cooling percent" for="symbol">*</label>
4.50
</h4>
The only piece of information I want is the figure, which in this specific example is 4.50.
So how can I go about this and make my cURL grab this and echo it instead of echoing the entire page?

Answer 1

You can solve this with XPath:
$html = login2('https://example.com/clue/holes.aspx');
$dom = new DOMDocument();
#$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$value = $xpath->query('//label[#id="ctl00_ctl00_PageContainer_MyAccountContainer_symPound"]/following-sibling::text()')->item(0)->nodeValue;
echo $value;