Redundant includes

mnorth

Hi all,

I'm a long time C/C++/Java programmer, but a php novice. I was wondering if there's any issue with reundant imports.

For example, if I have

//bclass.php
import("aclass.php");
class B extends A
{
...
}

and

//dclass.php
import("aclass.php");
class D extends A
{
...
}

Will I run into problems if/when I have a situation where I need classes A, B, and D all in one file?
Is there some php equivalent to the typical

#ifndef CLASS_A
#define CLASS_A, 
class A {...}
#endif

used in C++? Sorry if this seems like an obvious question, I'm still in the planning stages of my php project, so I have no real code to offer

NogDog

When including files that consist only of class and/or function definitions, I'd recommend using the require_once() or include_once() functions. Either will only include the file if it has not yet been included in the current script. ("Require" throws a fatal error if it cannot load the file, whereas "include" only throws a warning.)

PS: Assuming PHP 5+, you might also want to take a look at the [man]__autoload/man function.

Jack_McSlay

there's no such thing as import() on php. use include_once and/or define an __autoload() fuction to load classes automatically.

you can do

if (class_exists ('a') {
   class b {
(...)
   }
}

but that's necessary onle on very peculiar cases