Get a Dom element from website using php

Question

Hello guys I want to get an HTML node from website to show it in my website, but I can't do it.

This is my code.

$html = htmlentities(file_get_contents("http://stackoverflow.com/"));
$doc = new DOMDocument();
$doc->loadHTML($html);
$h1 = $doc->getElementsByTagName("title");
var_dump($h1);

And this is the result.

object(DOMNodeList)#2 (1) {
  ["length"]=>
  int(0)
}

Please help. Thanks in advance.

You definitely shouldn't be calling htmlentities. DOMDocument expects you to load the original HTML, not the HTML converted to entities. — Barmar
– Barmar, Commented Mar 8, 2017 at 22:33
Because this code $doc = new DOMDocument(); $doc->loadHTML("http://stackoverflow.com/"); $h1 = $doc->getElementsByTagName("title")->item(0)->textContent; print_r($h1); gives me Null. — Mohamed Kamel
– Mohamed Kamel, Commented Mar 8, 2017 at 22:38

Casimir et Hippolyte · Accepted Answer · 2017-03-08 23:14:09Z

2

There's no need to apply htmlentities on an html string before to parse it. If you do that, all angle brackets are replaced and the parser will no more find any tags.

There's also no need to use file_get_contents to load a file, since DOMDocument has a method to do it.

In your comment, you didn't use the good method to load an HTML file with its URL (and not an HTML string).

The DOMDocument method is DOMDocument::loadHTMLFile and not DOMDocument::loadHTML:

$doc = new DOMDocument();
$doc->loadHTMLFile("http://stackoverflow.com/");
$h1 = $doc->getElementsByTagName("title")->item(0)->textContent;
echo $h1, PHP_EOL;

Note that you can prevent the different warnings to be displayed using libxml_use_internal_errors(true); before this method.

edited Mar 8, 2017 at 23:14

answered Mar 8, 2017 at 23:06

Casimir et Hippolyte

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1 Comment

Mohamed Kamel Over a year ago

Thank you very much Can you recommend any document or website to me to know more about this topic?!! and what is the best methodology to use in php to get a web page content?!!!

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