Scott Klarr Jr
How to fix var-use-before-def-global PHP5 error within included files
var-use-before-def-global : Global variable $id was used before it was defined
If you make use of the code analyzer available in many modern IDE environments when coding strictly to PHP5 standards, you may have noticed that you will get errors thrown at you for using variables before they are declared in included files. For example, lets say you have two files, header.php and index.php.
<?
echo $someVariable;
?>
<?
$someVariable = "someValue";
include('header.php');
?>
If you analyzed header.php, you would get an error that says Global variable $someVariable was used before it was defined. This is easily fixed by defining the variables with the global type. Example:
<?
global $someVariable;
echo $someVariable;
?>
This will let the analyzer know that this variable pre-exists in the environment without changing its value.
As with other variable declarations in PHP5, you can define a whole set of variables without having to repeat the variable type over and over.
<?
global $someVariable1, $someVariable2, $someVariable3, $someVariable4;
?>
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Rafael Mar 30, 2009
Just a note
In CodeIgniter this will cause a problem.
If you have something like this:
and use what you wrote, the view ignores the "original" value from $header (came from controller $data['header'] = something; $this->load->view('view_file', $data);) and reset the value.
Besides, it's a good post.
Rafael Mar 30, 2009
Ops, the comments don't accepet php tag.
The correct:
"If you have something like this:
php_open_tag echo $header; php_close_tag
and use what....."