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Edit File: form-details.php

<!DOCTYPE html>
<html>
<head>

<body>

<h2>Contact Enquiries</h2>

<?php
if(isset($_GET['updated'])){
    echo "<script>alert('Updated Successfully');</script>";
}
?>

<table id="usersTable" class="display">
<thead>
<tr>
<th>ID</th>
<th>Name</th>
<th>Email</th>
<th>Phone</th>
<th>Subject</th>
<th>Message</th>
<th>Actions</th>
</tr>
</thead>
</table>

$(document).ready(function(){

$('#usersTable').DataTable({
    "ajax": "fetch.php",
    "columns": [
        { data: "id" },
        { data: "name" },
        { data: "email" },
        { data: "phone" },
        { data: "subject" },
        { data: "message" },
        {
            data: "id",
            render: function(data){
                return `<a href="edit.php?id=${data}">
                            <button>Edit</button>
                        </a>`;
            }
        }
    ]
});

});

</script>

</body>
</html>