maybe this way...

adminarea_useradmin.php

@@ -28,8 +28,46 @@ if($_SESSION['isadmin'] == 0) {
 }
 
 echo '<div class="alert alert-danger" role="alert">heres the admin world</div>';
+?>
+<?php
+include 'db.inc.php'
 
 
+//create connection
+$connection = mysqli_connect($mysqlhost, $dbuser, $dbpass, $dbname);
+
+//test if connection failed
+if(mysqli_connect_errno()){
+    die("connection failed: "
+        . mysqli_connect_error()
+        . " (" . mysqli_connect_errno()
+        . ")");
+}
+
+//get results from database
+$result = mysqli_query($connection,"SELECT * FROM users");
+$all_property = array();  //declare an array for saving property
+
+//showing property
+echo '<table class="data-table">
+        <tr class="data-heading">';  //initialize table tag
+while ($property = mysqli_fetch_field($result)) {
+    echo '<td>' . $property->name . '</td>';  //get field name for header
+    array_push($all_property, $property->name);  //save those to array
+}
+echo '</tr>'; //end tr tag
+
+//showing all data
+while ($row = mysqli_fetch_array($result)) {
+    echo "<tr>";
+    foreach ($all_property as $item) {
+        echo '<td>' . $row[$item] . '</td>'; //get items using property value
+    }
+    echo '</tr>';
+}
+echo "</table>";
+?>
+<?php
 echo '<br /> <br />';
 echo '<a href="adminarea.php"><button class="btn btn-info">Back</button></a>';
 ?>