What are best practices for defining and structuring form elements in PHP to ensure proper functionality?

When defining and structuring form elements in PHP, it is important to ensure proper functionality by following best practices such as using appropriate HTML form tags, setting form attributes correctly, and validating user input to prevent security vulnerabilities. One common mistake is not properly sanitizing user input before processing it, which can lead to SQL injection attacks or other security risks. 

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

Keywords

HTML forms form validation PHP arrays form submission data sanitization

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