What steps can be taken to troubleshoot and resolve errors related to transferring JavaScript variables to PHP in a form submission?

When transferring JavaScript variables to PHP in a form submission, ensure that you are properly sending the data using either AJAX or by including hidden input fields in the form. Make sure that the variable names match between JavaScript and PHP, and that the data is properly sanitized and validated on the server side to prevent any security vulnerabilities. 

// Example of transferring JavaScript variables to PHP in a form submission

// JavaScript code to send variables to PHP using AJAX
var data = { 
  variable1: 'value1',
  variable2: 'value2'
};

$.ajax({
  url: 'process.php',
  type: 'POST',
  data: data,
  success: function(response) {
    console.log(response);
  }
});

// PHP code in process.php to receive and process the variables
$variable1 = $_POST['variable1'];
$variable2 = $_POST['variable2'];

// Sanitize and validate the data as needed
// Process the variables further

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