How can I update echo $_SESSION['balance'] in real time when I make changes into the database?

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How can I update echo $_SESSION['balance'] in real time when i make changes into the database? I am trying to build a send and recieve system but when i send an ammount it doesnt get updated in real time.. How can i acheve that?

What I have tried:

<?php
session_start();
include "db_conn.php";
if (!$conn) {
	echo "Connection failed!";
}
$a = $_SESSION['id'];
$b = $_SESSION['balance'];
$c = $_REQUEST['amount'];
$sql = "UPDATE users SET balance=balance - ($c) WHERE id=($a)";
if ($conn->query($sql) === TRUE) {
  echo "Record updated successfully";
} else {
  echo "Error updating record: " . $conn->error;
}

 ?>

Posted 28-Oct-21 2:07am

madepi7751

Updated 31-Oct-21 0:52am

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Comments

Richard Deeming 29-Oct-21 4:50am

You've got much bigger problems to worry about!

Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation/interpolation to build a SQL query. ALWAYS use a parameterized query.

PHP: SQL Injection - Manual[^]
PHP: Prepared statements and stored procedures - Manual[^]

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Member 15413331 · Answer 1 · 2021-10-31T00:52:00

As other comments have stated you need to learn about SQL injection.

What you are trying to do can be achieved by using web sockets or http long polling

I would recommend that you use web sockets, using Ratchet, Ratchet is a PHP library providing developers with tools to create real time, bi-directional applications between clients and servers over Web-sockets.

Good luck.