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Variable scope....

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  #1  
Old July 15th, 2004, 06:04 AM
bah26 bah26 is offline
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Variable scope....
(I'm not sure how to explain this, so I'll give an example!)

PHP Code:
<?php 
 
$globalVariable = 'blah';
 
function test()
{
     echo $globalVariable; //output 'blah'
}
?>


I know it is possible to declare $globalVariable global within the function, however, this doesn't seem like a particularly great solution....

Is there a way to achieve this??


Cheers,

Ben
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  #2  
Old July 15th, 2004, 07:32 AM
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dhouston dhouston is offline
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It's typically considered better practice not to use global variables. Why not just pass the variable as a parameter to the function?
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Old July 15th, 2004, 11:07 PM
digitallysmooth digitallysmooth is offline
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A better way
Code:
<?php 

if (!defined('DEBUG')) { define('DEBUG', true); }

function ErrorHandler()
{
     if ( (defined('DEBUG')) && (true == DEBUG) ) {
       //output debug info
     }
}
?>
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Old July 16th, 2004, 03:10 AM
bah26 bah26 is offline
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Quote:
Originally Posted by dhouston
It's typically considered better practice not to use global variables. Why not just pass the variable as a parameter to the function?

It just seems a bit of a pain! (/me being lazy!)

laidbak's solution seems resonable, and I have taken that approaches for other tasks, I was just wondering if it was possible to define a variable as global.


Cheers,

Ben
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  #5  
Old July 16th, 2004, 05:53 AM
digitallysmooth digitallysmooth is offline
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Here is another way
PHP Code:
<?php

if (!isset($GLOBALS['DEBUG'])) { $GLOBALS['DEBUG'] = true; } 

function ErrorHandler()
{

     if ( (isset($GLOBALS['DEBUG'])) ) {
        printf('$DEBUG = %s'."\n", $GLOBALS['DEBUG'] ? 'true' : 'false');
     } else {
        print '$DEBUG does not exist in this scope'."\n";
     }

}

ErrorHandler();

?>
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  #6  
Old July 16th, 2004, 03:13 PM
kode_monkey kode_monkey is offline
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You can declare a variable as global in a backwards kind of way. You use the keyword global inside a function and it makes the variable available in that functions scope.

eg.

PHP Code:
<?php

$globalVariable = 'blah';

function test()
{
     global $globalVariable;
     echo $globalVariable; //output 'blah'
}
?>
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