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I mean a variable that will behave like PHP super global ($_POST,$_GET etc), so that once it is defined it becomes available to all scripts.

Isaiahiroko
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2 Answers2

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It is possible if you add an index to $GLOBALS.

Like this:

$GLOBALS['foo'] = 'bar';

$GLOBALS will be available in any scope.

Also you can just define a variable in the global scope. But to be available in functions it has to be declared in the function using the global keyword.

$foo = 1;

function test() {
    global $foo;
    echo $foo;
}
hek2mgl
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    Using global variables like this is generally frowned up. – Jason McCreary Apr 21 '13 at 20:57
  • Is the generally true? Can you explain why? – hek2mgl Apr 21 '13 at 21:19
  • *General* in [software design](http://stackoverflow.com/a/1557799/164998). PHP being a dynamic language makes doing so easy. But that doesn't means its [good](http://stackoverflow.com/a/12446305/164998). – Jason McCreary Apr 22 '13 at 00:44
  • What makes your constant approach better? Btw, This post about software design that you've linked isn't a good one. If you cannot explain it with own words, then I have to assume that it is just *because other's say*. Btw, I can give you some reasons for being this a bad design. But this would just being reasons for particular situations and not in general. Sometimes it is just quite useful. As you see with `$_GET`, `$_POST`, ... – hek2mgl Apr 22 '13 at 00:47
  • Why do you need more when the community has spoken? Look around you. The only *upvotes* on this question are comments saying that globals are *generally bad practice* and be careful how you use them. The question itself is downvoted. That should tell you something. – Jason McCreary Apr 22 '13 at 00:57
  • Note that community is not always right. Last friday I've earned 4 upvotes for a wrong regex. (corrected this of course) – hek2mgl Apr 22 '13 at 00:58
  • hek2mgl - Your answer helped me, though not completely. – Isaiahiroko Apr 25 '13 at 06:55
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You can do this by defining variables.

define(MY_VAR,"MY_VALUE");

You can go on and on and put all of them in a php file which you include in the other php files where you need those variables. You can select those variables like this:

include('VARS_FILE.php');
$var = MY_VAR;
Xandervr
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  • Constants are not the same as vars. They are read only. What if you need to change the value? – hek2mgl Apr 21 '13 at 21:09
  • That's true, but it is a good way to use some constant vars, but why wouldn't you work with sessions? – Xandervr Apr 21 '13 at 21:14
  • I don't think that `$_SESSION` is the right approach to the question. What if it is a cli script? – hek2mgl Apr 21 '13 at 21:16