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require_once doesn't work, "cannot redeclare class..."

Posted by Kimmo Laine on 02/24/06 11:20

I'm flipping my wig here, people. I'm using classes and making each class a
file. when I'm including dependet classess, I use require_once to avoid
multiple declarations - yet they happen. I put debug_print_backtrace in the
file to see how it is included, and here's the output:
#0 require_once() called at [\eKirje.textGrid.class.php:4]
#1 require_once(\eKirje.textGrid.class.php) called at
[\lasku.eKirjeLasku.class.php:3]#0 require_once() called at
[\eKirje.kanava.class.php:3]
#1 require_once(\eKirje.kanava.class.php) called at
[\eKirje.EPL8.class.php:3]
#2 require_once(\eKirje.EPL8.class.php) called at
[\eKirje.kirje.class.php:3]
#3 require_once(\eKirje.kirje.class.php) called at
[\lasku.eKirjeLasku.class.php:5]
<br />
<b>Fatal error</b>: Cannot redeclare class boxcontainer in
<b>\eKirje.boxcontainer.class.php</b> on line <b>5</b><br />As you see, it
does get required twice regardless of the use of require_once in each call.
And eventually the class gets declared again. My fix for the problem was to
use

if( !in_array('boxcontainer', get_declared_classes()) ) {
require_once('eKirje.boxContainer.class.php');
}

in the files and now it works, but I'm just totally baffeld of why this is
happening? How come the require_once fails to function? Am I missing
something here?

I made the simplest test case where I had four files where in the first of
them I declare a class, then require_once it to two other files and then
finally require_once the two files to a fourth file. In this case I did not
get redeclaration errors, for some reason it worked okay then, the class was
declared only one and it worked okay.

--
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