How to know which button is clicked in PHP - php

Question

I am trying to figure out a way to know which button is clicked using PHP. I am new to this "world" so it is kind of difficult for me to figure it out by myself.
So what basically i am doing is a website that will control an Arduino (iot) and i am giving the admin the privileges to give access to his house to who ever he wants and also deletes who ever he wants. i am doing this with the help with a database of course (mysql).
This is how it looks :
IMAGE HERE
When the admin fill the inputs and submit it will add a person to database then display it with a delete button. This is the code i m using for the button :
<form method="post" action="addAdmin.php">
<button type="submit" style="background:none; border:0; box-shadow: none; border-radius: 0px; cursor: pointer; color: red;"><i class="fas fa-trash-alt"></i></button>
</form>
I want to know how i can know which user did the admin choose to delete but i can not figure it out.
Thanks for your help !

Answer 1

What you need to do is supply information other than just having the delete button.
Currently the only thing you are doing is loading the addAdmin script, but you are passing zero information.
The simplest way to do this would be to add a hidden input with a key of the current user that the button is supposed to be for, like so:
<form method="post" action="addAdmin.php">
<input type="hidden" name="user" value="<?= $userID ?>" />
<button type="submit"><i class="fas fa-trash-alt"></i></button>
</form>
Then in the addAdmin script you can check the $_POST array for the user key, and work from there.

Answer 2

You can give the button the name attribute.
<form method="post" action="addAdmin.php">
<button type="submit" name="submit" style="background:none; border:0; box-shadow: none; border-radius: 0px; cursor: pointer; color: red;"><i class="fas fa-trash-alt"></i></button>
</form>

Answer 3

It can be achieved by utilizing name/value attributes of button tag.
This is a HTML chunk:
<form action="/delete.php" method="post">
<button name="delete_id" type="submit" value="1">User 1</button>
</form>
...
<form action="/delete.php" method="post">
<button name="delete_id" type="submit" value="2">User 2</button>
</form>
PHP code:
<?php
$deleteId = $_POST['delete_id'];
// call sql query and pass $deleteId
?>