PHP Form $_POST['button'] always false [closed] - php

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I'm trying to get submit form event to update a field. I found a test code on internet and that's worked. But when I change the button name for my button nothing happens, and the if always returns false to my button and I have no idea what i'm doing wrong.
Example code works:
<form action="" method="POST">
<input type="submit" name="add" Value="Call Add fun">
<input type="submit" name="sub" Value="Call Sub funn">
<?php echo #$a; ?>
<?php
if(#$_POST['add'])
{
function add()
{
$a="You clicked on add fun";
echo $a;
}
add();
} else if (#$_POST['sub']) {
function sub()
{
$a="You clicked on sub funn";
echo $a;
}
sub();
}
?>
I've tried some variations with if (isset($_POST["course_submit_btn"])) but again nothin happens.
I don't know if it has any interface, but the page url is "panel/create-course/?course_ID=3493/"
My page https://www.file.io/c0pn/download/C1kmP2TblfcU

Answer 1

<form action="" method="POST">
<input type="submit" name="add" Value="Call Add fun">
<input type="submit" name="sub" Value="Call Sub fun">
<?php
if(isset($_POST['add'])) {
add();
} else if (isset($_POST['sub'])) {
sub();
}
function add() {
echo "You clicked on add fun";
// todo: more meaningful functionality
}
function sub() {
echo "You clicked on sub fun";
// todo: more meaningful functionality
}
?>
Your code should work, however there are some tips, you should stick to:
Use consistent code styling (spaces, brackets etc),
Use more meaningful names, in a few days you won't know what variable $a is for
Don't put functions within if sections