[RESOLVED] PHP global variables

tinsel_mb

I have a config.php file which i use to store reusable functions.

I would like to declare some global variables in this file and use them in my other PHP files which include config.php.

These variables will store values such as the directory path where I want to store attachments or the sender email address for my automatic email feature, etc.

The values of these variables will not be modified by the other PHP files but their values need to be set in a single place for easy maintainance.

How can i achieve this please?

laserlight

There are a few ways to do this. One way is to create a $config array at global scope, then set the various values that you want to set. In each function that needs it, you do a global $config; then access it. However, the values will be modifiable. Another way is to define a class whose members are constant.

NogDog

If they are static values that no other code should need to change, you can define() them as constants, since all constants are global.

Weedpacket

As well as [man]define[/man], you can use [man]const[/man]. See the page for the details on the differences. For your purposes they're probably more technical than anything else (e.g., one takes effect at runtime, the other at compile time); but

Since define() is a function that takes arguments it can be used programmatically like other functions; while const declarations have to be written out explicitly
If you have a lot of the things, the fact that const is compile-time and define is run-time can make for a noticeable performance edge in favour of the former.

tinsel_mb

thanks all! your answers have helped me. i will use const.