我正确使用这些全局变量吗？

Question

I'm a newbie to php, and I'm in the process of hacking through some moodle code for a prototype.

Anyhows I have some data Id like passed from file1.php to file2.php, for which Im using global variables. The values are intialized in file2 and I need them for use in file1. Here's how I go about it

file1.php

 <?php// top of file 1

 global $content; // discussion content // line 3

file2.php

global $content;// line 3379

  $content=$post->subject;

Back in file1.php

   echo 'global scope'.$content; // this is always empty// line 168

Am I missing something here? Attached files file1.php and file2.php

Answer 1

You use global to get a global variable

//file 1
$a = "im a global variable";

function foo(){
    global $a;
    echo $a;
}

//file 2
require "file1.php";

function foo2(){
    global $a;
    echo $a;
}