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Bug #3403 duplicate loading of include files
Submitted: 2000-02-04 09:42 UTC Modified: 2000-07-28 02:02 UTC
From: terado at hotmail dot com Assigned:
Status: Closed Package: Other
PHP Version: 3.0.14 OS: All
Private report: No CVE-ID: None
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From: terado at hotmail dot com
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 [2000-02-04 09:42 UTC] terado at hotmail dot com 
This probably is not strictly a bug but is certainly something that does not follow normal programming methods and so is important.

When you include or require a file there is no logical way to prevent duplicate loading.  So for example if there are three files as:

//File 1 - file1.php3
include "imp.inc";
testimp();
include "file2.inc";

//File 2 - file2.inc
include "imp.inc";
testimp();

//File 3 - imp.inc
function testimp(){
    print "hello\n";
}

This will not work, also using require.  I would either expect that I could put something like #ifndef to prevent reinclusion or I would expect this to infact be the difference that require would play.

It is also a real pain to get around this problem.

Hope this is clear, and relevant.

Thanks, Nick

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 [2000-07-28 02:02 UTC] hholzgra@php.net 
on php4 you have include_once() and require_once()

for php3 you can do:

---8<----- filename.inc -----------------
if(! $included_filename){
... whatever code you want, including function definitions ...
}
$included_filename=true;
--------------------->8-----
 
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