Update

<?php
$servername = "localhost"; 
$username = "root"; 
$password = ""; 
$database = "ait"; 

// Create connection 
$conn = new mysqli($servername, $username, $password, $database); 

if ($conn->connect_error) 
{ 
    die("Connection failed: " . $conn->connect_error); 
} 

// Update data 
$sql = "UPDATE student SET  Fees = 30000 WHERE  Student_name = 'Ali'"; 

if ($conn->query($sql) === TRUE) 
{ 
    echo "Record updated successfully!"; 
} 
else 
{ 
    echo "Error updating record: " . $conn->error; 
} 

$conn->close(); 
?>

Output