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because you haven't specified a length of 1 (one) - https://www.php.net/manual/en/function.substr.php

Don't use the version from FlatPak: it's unofficial and apparently buggy. Install VS Code from an official source.

Here's my attempt DATA mysql> select * from ajoo -> order by user, recno; +-------+----------+---------+---------+ | recno | user | v_score | rollavg | +-------+----------+---------+---------+ | 6 | mina1111 | 4 | 3.2500 | | 7 | mina1111 | 3 | 3.2000 | | 8 | mina1111 | 2 | 3.2000 | | 9 | mina1111 | 4 | 3.4000 | | 10 | mina1111 | 5 | 3.6000 | | 11 | mina1111 | 0 | 2.8000 | | 12 | mina1111 | 1 | 2.5000 | | 13 | mina1111 | 1 | 1.7500 | | 14 | mina1111 | 1 | 0.7500 | | 1 | nina1

Editor is a bit buggy with multiple toolbar rows, but I think I got it.

Over the lifetime of this (or any other) Application, you will spend far more time reading its code than you will writing any of it so go for whichever form expresses your intention most clearly. Personally, I'd go with the former or, perhaps, an even more concise one: if ( ! isset( $_SESSION['user'] ) ) exit ; if ( 'SiteOwner' !== $_SESSION['user'] ) exit ; I'm not sure of the context in which this runs - perhaps a redirect to another page might be more appropriate than the "exit"? YMMV. Regards, Phill W.

if(!isset($_SESSION['user']) || $_SESSION['user'] !== 'SiteOwner') { exit; }

<a href="\"index.php?id=".<?php echo $data['id']; ?>."\">"

Excellent! If anyone asks, you're now applying the Principle of Least Privilege, getting your application work with the minimum level of permissions - just what it needs and nothing more. Also, you are now qualified to laugh openly at anyone that runs their entire Application as root. 😉 Regards, Phill W.

Before you can use $_SESSION you must call "session_start()". Put it at the start of the code.