Is it recommended to use hidden input fields in PHP forms to set default values?

It is not recommended to use hidden input fields in PHP forms to set default values as it can be easily manipulated by users. Instead, default values should be set directly in the form fields or handled in the backend code. One way to handle default values in PHP forms is to check if the form field is empty and assign the default value if it is. 

<input type="text" name="username" value="<?php echo isset($_POST['username']) ? $_POST['username'] : 'default_username'; ?>">

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hidden input fields default values PHP forms recommended technical

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