How can a user's selection from a dropdown list be transferred to a PHP session variable for further use?

To transfer a user's selection from a dropdown list to a PHP session variable, you can use JavaScript to capture the selected value and send it to a PHP script using AJAX. In the PHP script, you can then store the value in a session variable for further use. 

// HTML dropdown list
<select id="dropdown">
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

// JavaScript to send selected value to PHP script
<script>
document.getElementById('dropdown').addEventListener('change', function() {
  var selectedValue = this.value;
  
  // Send selected value to PHP script using AJAX
  var xhr = new XMLHttpRequest();
  xhr.open('POST', 'store_selection.php');
  xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
  xhr.send('selectedValue=' + selectedValue);
});
</script>

// PHP script (store_selection.php) to store selected value in session variable
<?php
session_start();

if(isset($_POST['selectedValue'])) {
  $_SESSION['selectedValue'] = $_POST['selectedValue'];
}
?>

Keywords

PHP session variable dropdown list form submission data transfer

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