php claims my defined variable is undefined

Question

My php is a little rusty but this is boggling my mind right now. I googled this and read all the stackoverflow questions I could find that looked related, but those all seem

Answer 1

<?php
$msgs = "";

function add_msg($msg){
  global $msgs;
  $msgs .= "<div>$msg</div>";
}
function print_msgs(){
  global $msgs;
  print $msgs;
}

add_msg("test");
add_msg("test2");
print_msgs();
?>

global tells that PHP need to use the global variable in the local function scope.

Answer 2

Using globals for something like this is a poor practice. Consider an alternate approach such as the following:

class MessageQueue {
  private static $msgs;


  public static function add_msg($msg){
    self::$msgs .= "<div>$msg</div>"; 
  }
  public static function print_msgs(){
    print self::$msgs;
  }
}


MessageQueue::add_msg("test");
MessageQueue::add_msg("test2");
MessageQueue::print_msgs();

Answer 3

It's defined at the global scope. Use global if you want to use it.

Answer 4

if you don't want to use globals, you can jast use

 function add_msg($msg)
   {
         echo  "<div>$msg</div>";
   }
    add_msg("test");
    add_msg("test2");

function, the result will be the same.