php在一系列函数中包含全局文件

Question

I am writing a template which will have a series of functions and several of them will access the same include file which access a serial of classes. My idea was something like

<?php
   require_once("myfile.php");
   $db = new classthing();

 function1(){
   return $db->afunction;
 }

 function2() {

   return $db->anotherfunction;
 }

it does not seem to want to work!

Answer 1

In PHP functions act in its own scope. In your case you can go in few ways:

a) passing $db instance as function parameter:

 require_once("myfile.php");
 $db = new Classthing();

 function1(Classthing $db){
     return $db->afunction;
 }
 $a = function1($db); // invocation

b) using global keyword to access variables from global scope:

require_once("myfile.php");
   $db = new Classthing();

 function1(){
   global $db;
   return $db->afunction;
 }
 $a = function1(); // invocation