What are the advantages and disadvantages of passing variables using the "Post" method compared to other methods in PHP?

When passing variables in PHP, using the "Post" method has the advantage of being more secure than using the "Get" method, as the variables are not visible in the URL. However, using the "Post" method can be slightly more complex to implement compared to the "Get" method. Additionally, using the "Post" method may not be suitable for passing large amounts of data due to server limitations.

<form method="post" action="process_form.php">
    <input type="text" name="username">
    <input type="password" name="password">
    <input type="submit" value="Submit">
</form>