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Data is not coming from mysql

It is showing that connection has been created. But I don't know what is the problem in query. After that query I tried to echo something and it is visible there in browser.

<html>
    <head>

    </head>
<body>

<?php
$servername = "localhost:8888";
$username = "root";
$password = "";
$dbname = "employees";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}else {
    echo "Connected successfully";
}

$res = mysqli_query($conn,"select * from dept_manager");
echo"dept_manager";
while($row=mysqli_fetch_assoc($res))
{
?>
<table>
    <tr>
        <td><?php echo $row['emp_no'] ?></td>
        <td><?php echo $row['dept_no']?></td>
        <td><?php echo $row['from_date'] ?></td>
        <td><?php echo $row['to_date'] ?></td>  
    </tr>
</table>
<?php
}
?>
</body>
</html>
$sql = "select * from dept_manager";
$result = $conn->query($sql);
while($row = $result->fetch_assoc()){
      // your code here

}

Try with this..

Try this in the place of while loop:

<?php
    $res = mysqli_query($conn,"select * from dept_manager");
    echo"dept_manager";
    echo "<table>";
    while($row=mysqli_fetch_assoc($res))
    {
     echo "<tr><td>" . $row['emp_no'] . "</td><td>" . $row['dept_no'] . "</td><td>" . $row['from_date'] . "</td><td>" . $row['to_date'] . "</td></tr>";
    }
echo "</table>";
?>

You have mentioned servername:localhost:8888 just check once remove 8888 and try.

I have tried with your code in my local system,same code working fine.

Just i have entered my database name and table name,it's working fine.

So you just follow my example and test once.

COde:-

<html>
<head>
</head>
<body>

<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "mydashboard";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
else{
echo "Connected successfully";
}

$res = mysqli_query($conn,"select * from content_values");

while($row=mysqli_fetch_assoc($res))
{
?>
<table>
    <tr>
        <td><?php echo $row['name'] ?></td>
    </tr>
</table>
<?php
}
?>
</body>
</html>

Output:-

Connected successfully

Name:
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