Question

I know this has been answered before and why this is caused. However, in my case, the problem is happening only on MacOS Lion (10.7) which is on php 5.3.6. The same code base is running on my windows 7 machine which is on php 5.3.8.

I have used require_once all over the place. The code fragment that seems to be causing the problem is:

class DbBase
{
   ...
}

in a file that is included from multiple files. However the error disappears if I wrap the class declaration inside of:

if (class_exists('DbBase') != true)
{
    class DbBase
    {
        ...
    }
} 

I have this scenario:

File DBBase.php:

defines Class DBBase

File A_DB.php:

require_once("DBBase.php")

File B_DB.php:

require_once("DBBase.php")

File foo.php:

require_once("A_DB.php")
require_once("B_DB.php)

So the file DBBase.php does get included twice. Does it?

Any insight is appreciated.

Answer 1

This error occurs when you declare a single class multiple times instead of once ; The code below would throw that error.

class phpp{}
class phpp{}

It is unlikely that the behaviour is not the same on 5.3.6 and 5.3.8 as there haven’t been any significant changes in classes and objects.

You should check for duplicated codes in the files you are requiring once. . .

EDIT :

The require_once() statement is identical to require() except PHP will check if the file has already been included, and if so, not include (require) it again.

So in your case it is not being included multiple times, whereas it would if you use require or include.

However you should restructure your entire code to prevent class redeclaration’s.

class lol{}
if(!class_exists("lol")){
    class lol{
        function ll (){
            return "ss";
        }
    }
}

echo lol::ll(); 

You wouldnt be able to access that ^^ , since its still a redeclaration.