Why I have this scope problem in PHP?

Question

Two files: "a.php" and "b.php"

a.php
(I require some constant to fill in the function (This is ok)
$link = mysqli_connect(W,X,Y,Z);

b.php
(I need the $link for a query)
require 'a.php' (I also tried 'include')
$result = mysqli_query($link, "SQL STATEMENT IN HERE");

OK, the problem is that PHP shows a warning of UNDEFINED VARIABLE link.

I tried everything but still doesn't work.

Any idea?

Answer 1

a.php

$link = mysqli_connect(W,X,Y,Z);

b.php

require 'a.php';
$result = mysqli_query($link, "SQL STATEMENT IN HERE");
------------

This should work, but it doesn't.

I've tried with global, and that doesn't work neither

Answer 2

are you using this Mysqli_query() within a function.?

if yes then use global $link, after declaration of that function like..

function FuncName(){
global $link;
//……your code
}