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<?php require_once 'config.php'; $state_id = $_POST["state_id"]; $sql="SELECT * FROM statesandcity WHERE state = '".$state_id."'"; ?> <?php $res=$conn->query($sql); if($res->num_rows > 0) { while($row=$res->fetch_assoc()) { ?> <option value="<?php echo $row["city"];?>"><?php echo $row["city"];?></option> <?php } ?> <?php }else{ echo "error"; } ?>