Question

I run the code first on MAMP and it worked very well. But when I tried to run the code on another server, I got a lot of warnings like:

Warning: DOMDocument::loadHTML(): Unexpected end tag : head in Entity,
line: 3349 in /cgihome/zhang1/html/cgi-bin/getPrice.php on line 17
Warning: DOMDocument::loadHTML(): htmlParseStartTag: misplaced tag in
Entity, line: 3350 in /cgihome/zhang1/html/cgi-bin/getPrice.php on
line 17 Warning: DOMDocument::loadHTML(): Tag header invalid in
Entity, line: 3517 in /cgihome/zhang1/html/cgi-bin/getPrice.php on
line 17

The codes are following:

<?php
 $amazon = file_get_contents('http://www.amazon.com/blablabla');
 $doc = new DOMdocument();
 $doc->loadHTML($amazon);
 $doc->saveHTML();
 $price = $doc -> getElementById('actualPriceValue')->textContent;
 $ASIN = $doc -> getElementById('ASIN')->getAttribute('value');
?>

Anyone knows what’s going on? Thanks!

Answer 1

To disable the warning, you can use

libxml_use_internal_errors(true);

This works for me, Manual, read on:

---

Background: You are loading invalid HTML. Invalid HTML is quite common, DOMDocument::loadHTML corrects most of the problems, but gives warnings by default.

With libxml_use_internal_errors you can control that behavior. Set it before loading the document:

$previously = libxml_use_internal_errors(true);
$doc->loadHTML($amazon);

Then after loading you can deal with the errors (if you want/need to):

/* @var LibXMLError[] $xmlErrors */
$xmlErrors = libxml_get_errors();

And finally clear them (as they will add up) and restore the previous setting if applicable:

unset($xmlErrors);
libxml_clear_errors();
libxml_use_internal_errors($previously);

---

References

• libxml_use_internal_errors Disable libxml errors and allow user to fetch error information as needed
• libxml_clear_errors Clear libxml error buffer
• libxml_get_errors Retrieve array of errors
• LibXMLError The libXMLError class
• Stackoverflow answer to DOMDocument PHP Memory Leak (by Tak; Dec 2011)