What are the limitations of using define variables for security measures in PHP?

Using defined variables for security measures in PHP can be limited because they are static and can be easily overwritten. To enhance security, consider using functions like filter_input() to sanitize and validate user input before processing it in your code. 

$user_input = filter_input(INPUT_POST, 'user_input', FILTER_SANITIZE_STRING);

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define variables limitations security measures PHP

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