What are potential pitfalls when passing variables from JavaScript to PHP in a web development project?

One potential pitfall when passing variables from JavaScript to PHP in a web development project is not properly sanitizing the input data to prevent security vulnerabilities like SQL injection or cross-site scripting attacks. To solve this issue, it is important to use server-side validation and sanitization techniques before processing the data in PHP. 

// Example of sanitizing input data passed from JavaScript to PHP
$input_data = $_POST['input_data']; // Assuming the data is passed via POST method

// Sanitize the input data using htmlspecialchars to prevent XSS attacks
$sanitized_data = htmlspecialchars($input_data);

// Further validation and processing of the sanitized data
// ...

Keywords

JavaScript PHP variable passing AJAX data validation

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