How can the structure of an HTML document impact the functionality of a PHP script that processes form data?

The structure of an HTML document can impact the functionality of a PHP script that processes form data if the form elements are not properly nested within the form tags or if the form submission method is not specified correctly. To solve this issue, ensure that all form elements are enclosed within the <form> tags and that the method attribute is set to "post" or "get" depending on the desired form submission method. 

&lt;form method=&quot;post&quot; action=&quot;process_form.php&quot;&gt;
  &lt;input type=&quot;text&quot; name=&quot;username&quot;&gt;
  &lt;input type=&quot;password&quot; name=&quot;password&quot;&gt;
  &lt;input type=&quot;submit&quot; value=&quot;Submit&quot;&gt;
&lt;/form&gt;

Keywords

HTML document structure PHP script form data processing functionality impact error handling

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