I want to export the phone numbers in .txt format line by line.  Table name is customers and the column name is customer_contact_numbers from the database saiautocare I am using the Laravel framework, JQuery and MySQL database. 
When I click that button it will ask me where to save the file and export the numbers line by line into the text file.
Here's the code:
      <div class="col-sm-6 col-lg-3">
    <div class="card text-white bg-primary">
      <div class="card-body pb-0">
        <div class="btn-group float-right">
          <button type="button" class="btn btn-transparent dropdown-toggle p-0" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            <i class="icon-settings"></i>
          </button>
          <div class="dropdown-menu dropdown-menu-right">
            <a class="dropdown-item" href="#">Export to TXT</a>
          </div>
        </div>
        <h4 class="mb-0">{{ $TotalCustomers }}</h4> 
        <p>Marketing Numbers</p>
      </div>
      <div class="chart-wrapper px-3" style="height:70px;">
        <canvas id="card-chart1" class="chart" height="70"></canvas>
      </div>
    </div>
  </div>
I'm new to PHP and MySQL, that's why I'm sorry if I am not able to provide all the required information.
