What are potential pitfalls when manipulating variable content in PHP?

One potential pitfall when manipulating variable content in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To mitigate this risk, always validate and sanitize user input before using it in your code. 

// Example of sanitizing user input using the filter_var function
$user_input = $_POST['user_input']; // Assuming user input is received via POST method
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

Keywords

type juggling variable scope data validation security vulnerabilities error handling

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