File "customizing-parsing-behavior.md"

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```php
// Write a function with parameter "$element"
function my_callback($element) {
        // Hide all <b> tags
        if ($element->tag === 'b')
                $element->outertext = '';
}

// Register the callback function with its function name
$html->set_callback('my_callback');

// Callback function will be invoked while dumping
echo $html;
```