What are some potential pitfalls to be aware of when passing data from JavaScript to PHP?

One potential pitfall when passing data from JavaScript to PHP is not properly sanitizing and validating the data on the server side, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To mitigate this risk, it is important to use PHP functions like htmlspecialchars() to sanitize user input and prevent malicious code from being executed. 

// Example of sanitizing user input passed from JavaScript to PHP
$user_input = $_POST['user_input'];
$sanitized_input = htmlspecialchars($user_input);

Keywords

JavaScript PHP data passing security vulnerabilities cross-site scripting

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