Why Does DOMDocument::loadHTML Throw Errors About Missing Quotation Marks?

Mitigating DOMDocument LoadHTML Errors: Resolving Enclosing Quotation Marks

When attempting to load HTML content into a DOMDocument, you may encounter a warning and fatal error related to missing closing quotation marks in an entity reference. To troubleshoot this issue, let's delve into the code provided:

$html = file_get_contents("http://www.somesite.com/");

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

echo $dom;

This code attempts to fetch HTML content from a website, load it into a DOMDocument, and echo the resulting document. However, it throws the following warning and fatal error:

Warning: DOMDocument::loadHTML(): htmlParseEntityRef: expecting ';' in Entity,
Catchable fatal error: Object of class DOMDocument could not be converted to string in test.php on line 10

The warning indicates that the HTML content contains an entity reference that lacks proper closing quotation marks. To resolve this, we can use the following steps:

1. Enable Internal Error Handling: To prevent PHP from terminating the script due to the warning, we can enable internal error handling:

<code class="php">// create new DOMDocument
$document = new \DOMDocument('1.0', 'UTF-8');

// set error level
$internalErrors = libxml_use_internal_errors(true);</code>

2. Load HTML and Retrieve Errors: Once internal error handling is enabled, we can load the HTML content into the DOMDocument and retrieve any encountered errors:

<code class="php">// load HTML
$document->loadHTML($html);

// Retrieve errors
$errors = libxml_get_errors();</code>

3. Iterate and Address Errors: The $errors array will contain a list of error objects. We can iterate through these errors and address them accordingly, such as adding the missing closing quotation marks.
4. Disable Internal Error Handling: Once the errors have been addressed, we can disable internal error handling to restore normal PHP error handling:

<code class="php">// Restore error level
libxml_use_internal_errors($internalErrors);</code>

By implementing these steps, we can effectively mitigate the warning and fatal error related to missing closing quotation marks in entity references. This ensures that the DOMDocument can be loaded and processed successfully.

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