View difference between Paste ID: m60qNa1m and vPXfCzpk

 <select name="cc">
 	<?php display_countries(""); ?>
 </select>
 
 // Call `display_countries` with empty string to all countries
 // Call `display_countries($country_id)` then option will displayed as selected.
 
 
 <?php
 
 function display_countries($country_id) {
 
 	// write your query
 	$query = "SELECT country_id, country_name FROM Countries";
 
 	// now run your query with connection or link
 	$run_query = $link->query($query);
 
 	// here option will be display and we will stored and get it from the array
-	while ($r = $link->fetch_array(MYSQL_BOTH)) {
+	while ($r = $run_query->fetch_array(MYSQL_BOTH)) {
 
 		$is_selected = "";	// first is_selected to empty
 		if ($r['country_id'] == $country_id) {
 			$is_selected = "selected"; // $country_id is equal to id from the database then its a selected option
 		}
 
 		// print the required option for selected with $is_selected variable
 		// $r['country_id'] and $r['country_name'] are the column name from database
 		echo "<option value='" . $r['country_id'] . " $is_selected '>" . $r['country_name'] . "</option>";
 
 
 	}
 
 
 }