Confirmation alert is not working on click a button , How to make this work with php?

Question

I have a button that delete all the records in a table in a database

<button name="delete-all" class="alert alert-danger delete-all" ><i class="fa fa-close"></i>Delete All</button>

I want when it's clicked a confirmation dialog appears and if it's confirmed this happen :

$state = $connect->prepare("DELETE *  FROM data ");
$state->execute();
// Then a success message appears at the top of the page 
        echo '<div class="container alert alert-success" role="alert">Well done!  You  successfully  Deleted All Records</div>'; 

How to do that because when I insert a php script inside confirmation function An error occur :

unexpected <

<script>
  //confirmation function(){
         <?php
               echo '<div class="container alert alert-success" 
               role="alert">Well done!  You  successfully  Deleted All 
                Records</div>'; 
         ?>
  }
</script>