Update a column in PHP [closed] - php

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I am trying to look for a way to update a column.
Like here:
Database: temptestsite
Table: firstsection
then there is username, heading etc (not a log in type situation).
Say user sends in the username and I want them to be able to change it. How does one UPDATE this specific column. Anything I have tried so far from w3schools inserts a new column. Could someone please make an example of how to do this with PHP?
Like let there be a text box and then a button or a hyperlink next to it saying "update" or "change", whatever user types in that text box, gets updated in the "usernames" column in the database.

Answer 1

Your general process will be:
Check if post data is available
If it is, execute a mysql update call
Build the form
Here is some skeleton code:
<?php
$link = mysqli_connect("myhost","myuser","mypassw","mybd");
$id = $_GET['id'];
if (!empty($_POST)) {
$link->query("UPDATE users SET username = '".$link->real_escape_string($_POST['username'])."' WHERE id = '".$link->real_escape_string($id)."'");
}
$user = mysqli_fetch_assoc($link->query("SELECT * FROM users WHERE id = '".$link->real_escape_string($id)."'"));
?>
<form method="POST">
<input type="text" name="username" value="<?php echo $user['username'] ?>"/>
<input type="submit" value="Update"/>
</form>

Answer 2

There is two update method in rest system,
One of them is PUT , other one is PATCH,
Most frameworks make that request via hidden _method attr, like in laravel
<form method="POST">
<input type="hidden" name="_method" value="PUT"/>
<input type="text" name="column"/>
<input type="submit" value="Update"/>
</form>
PUT is using for changing entire column,
PATCH is just patching as you can understand,
First understand and manage what you really need, then watch & read about them.
As an answer maxhud is explained code version of it.
But it is not the good way to make it with post request.