/PHP/ Notice: Undefined variable: username in G:\xampp\htdocs\Online Class Platform\students_register.php on line 166

Notice: Undefined variable: username in G:\xampp\htdocs\Online Class Platform\students_register.php on line 166

Notice: Undefined variable: username in G:\xampp\htdocs\Online Class Platform\students_register.php on line 166

There is no variable. thats the reason
  
  function sum() {
  	// args looks like: array(1,2,3)
    $args = func_get_args();  
    return array_sum($args);
}

echo sum(1,2,3);   // prints 6

$name = isset($_POST['name']) ? $_POST['name'] : '';
if (isset($_POST['submit']) && $human == '4') {

Undefined reference to `pthread_create' c++

add_compile_options(-pthread)

Source: stackoverflow.com

Undefined reference to `pthread_create' c++

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")

Source: stackoverflow.com

PHP Fatal error: Uncaught Error: Call to undefined function Moontoast\Math\bcadd() in /var/www/html/sms-reporting-portal/vendor/moontoast/math/src/Moontoast/Math/BigNumber.php:506

#change php version with your version
apt install php7.4-bcmath

#nginx 
systemctl restart nginx
#For Apache
systemctl restart apache2

Undefined index: gross_wt in C:\xampp\htdocs\aezaz\Dev\login\pdf_export\gb1.php on line 34

$name = isset($_POST['name']) ? $_POST['name'] : '';
if (isset($_POST['submit']) && $human == '4') {

Notice: Undefined variable: _SESSION in C:\xampp\htdocs\practice\header.php on line 7

<?php session_start();
include("inc/incfiles/header.inc.php")?>
<html>
<head>
<meta http-equiv="Content-Type" conte...

-1

Source: stackoverflow.com

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<br /><b>Notice</b>: Undefined variable: username in <b>G:\xampp\htdocs\Online Class Platform\students_register.php</b> on line <b>166</b><br />

Notice: Undefined variable: username in G:\xampp\htdocs\Online Class Platform\students_register.php on line 166

Undefined reference to `pthread_create' c++

Undefined reference to `pthread_create' c++

PHP Fatal error: Uncaught Error: Call to undefined function Moontoast\Math\bcadd() in /var/www/html/sms-reporting-portal/vendor/moontoast/math/src/Moontoast/Math/BigNumber.php:506

Undefined index: gross_wt in C:\xampp\htdocs\aezaz\Dev\login\pdf_export\gb1.php on line 34

Notice: Undefined variable: _SESSION in C:\xampp\htdocs\practice\header.php on line 7