Hướng dẫn undefined function mysql_fetch_assoc

I'm new to PHP and am looking for some beginner help. I don't understand why this simple while loop is not working. I've checked for syntax errors with various variations and don't think that's the case.

The error says:

Fatal error: Uncaught Error: Call to undefined function mysql_fetch_assoc[] in /opt/lampp/htdocs/basic-procedural-php-project/index.php:77 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/basic-procedural-php-project/index.php on line 77

The code is as follows:






            

whatever

The database is as follows:

DB NAME: timesNumbers
DB TABLE NAME: data
COLUMNS: t_id, t_name, t_firstNo, t_secondNo

Can someone explain what the error means, the problem and how to fix it? I feel like it might be something basic that I'm not getting. Thanks for and help here.

Also the db.php file includes:


I am receiving the error "Call to undefined function mysql_fetch_assoc[]" on this line of code;

while [$row =mysql_fetch_assoc[$result]]{

This is the full php code I am using for the function. It is initially to upload a users profile picture

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