I came accross a bug in Symfony today when I installed a copy on our php 5.0.1 development server.

Turns out, php 5.0.1. doesn’t yet have the function “interface_exists()”, which was added in 5.0.2. Minor issue, but it IS being called as part of the Symfony bootstrapping procedure, so it crashes.

Luckily, in 5.0.1 the “class_exists()” method returns the same result, so putting the following lines into the app config.php file (or even into the symfony constants.php) should fix it:

if( !function_exists( 'interface_exists' ) ) {
function interface_exists( $name ) {
return class_exists( $name );
}
}

I say “should,” because in actuality this didn’t fix my problem (but it SHOULD, shouldn’t it? ). So I tried simply returning false, and, well.. it works..

Let me know if you know why that is. For now I’m happy it works, and come next php version, I won’t have to worry about it..

Hope that helps someone out there who has the same problem.