How can HTML code affect the functionality of PHP scripts, especially when interacting with forms?

When HTML code is not properly structured or formatted in forms that interact with PHP scripts, it can lead to issues such as incorrect data being submitted or not being processed correctly. To ensure proper functionality, it is important to use appropriate HTML elements and attributes that work seamlessly with PHP scripts, such as setting the correct form method (GET or POST) and input field names that correspond to PHP variables. 

<form method="post" action="process_form.php">
  <label for="username">Username:</label>
  <input type="text" id="username" name="username">
  
  <label for="password">Password:</label>
  <input type="password" id="password" name="password">
  
  <input type="submit" value="Submit">
</form>

Keywords

HTML PHP scripts forms functionality interaction

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