What are the potential security risks associated with passing variables in PHP?

Passing variables in PHP can pose security risks such as injection attacks if the input is not properly sanitized or validated. To mitigate these risks, it is important to always sanitize and validate user input before using it in your code. 

// Example of sanitizing user input using filter_var
$user_input = $_POST['user_input'];
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

Keywords

SQL injection cross-site scripting data validation input sanitization secure coding practices

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