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> Using Global Variables Inside Functions

This is a discussion on Using Global Variables Inside Functions, within the PHP section. This forum and the thread "Using Global Variables Inside Functions" are both part of the Programming Your Website category.

 
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> Using Global Variables Inside Functions
MikeHopley
post Apr 25 2008, 06:41 AM
Post #1


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Right at the beginning of my PHP, I set a variable:

CODE
$host = "http://".$_SERVER['HTTP_HOST'];


I then use this variable for building URLs. It works fine for most of the PHP, but it doesn't work inside a function (it returns an empty string). Why?

I can simply set it again inside the function, but is this necessary? Why can't I call global variables from inside a function?

**edit**

Well, it works if I pass it to the function as an argument. Is that the way to go?

This post has been edited by MikeHopley: Apr 25 2008, 06:44 AM
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Rakuli
post Apr 25 2008, 08:48 AM
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Hi Mike,

You have to declare the variable as global inside the function otherwise function scope will not recognise it.

CODE
function thisFunction ()
{
     global $host;
}


Now the function will have access to whatever the the value of $host when the function is run.

Hope that helps


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MikeHopley
post Apr 25 2008, 09:14 AM
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QUOTE (Rakuli @ Apr 25 2008, 02:48 PM) *
CODE
function thisFunction ()
{
      global $host;
}


Excellent. That's far more sensible than my hack of passing unnecessary arguments.

Thanks!
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