復制代碼 代碼如下:

<?php
$db_name="test";
$db_username="root";
global $db_password;
?>

復制代碼 代碼如下:

<?php
require("config/config.php");
class db{
function fun(){
global $db_username,$db_password;
echo "數據庫用戶名：".$db_username."<br />";
echo "數據庫密碼：".$db_password."<br />";
}
}
?>

復制代碼 代碼如下:

<?php
require("include/db.fun.php");
$a= new db();
$a->fun();
?>

復制代碼 代碼如下:

<?php
$a = 1; /* global scope */
function Test()
{
echo $a; /* reference to local scope variable */
}
Test();
?>

復制代碼 代碼如下:

<?php
$a = 1;
$b = 2;
function Sum()
{
global $a, $b;
$b = $a + $b;
}
Sum();
echo $b;
?>