What are some common pitfalls when using JavaScript to pass variables between pages in PHP?

One common pitfall when passing variables between pages in PHP using JavaScript is not properly sanitizing user input, which can lead to security vulnerabilities. To solve this issue, it is important to validate and sanitize the data before passing it to the next page. 

// Example of validating and sanitizing user input before passing it to the next page
$variable = $_POST['variable'];

// Validate and sanitize the input
$variable = filter_var($variable, FILTER_SANITIZE_STRING);

// Pass the sanitized variable to the next page using JavaScript
echo "<script>let variable = '" . $variable . "';</script>";

Keywords

JavaScript variables pages PHP passing

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