// في ملف edit_agent.php
$agent_id = $_GET['id'];
$query = "SELECT * FROM agents WHERE id='$agent_id'";
$result = mysqli_query($conn, $query);
$row = mysqli_fetch_assoc($result);
?>
<form action="edit_agent.php" method="post">
    <input type="hidden" name="agent_id" value="" />
    <label>Name:</label><input type="text" name="name" value="" />
    <label>Phone:</label><input type="text" name="phone" value="" />
    <label>Username:</label><input type="text" name="username" value="" />
    <label>Password:</label><input type="text" name="password" value="" />
    <label>Status:</label>
    <select name="status">
        <option value="active" >Active</option>
        <option value="inactive" >Inactive</option>
    </select>
    <input type="submit" name="edit_agent" value="Update Agent" />
</form>