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Default php variable

Posted on 2011-02-21
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Last Modified: 2012-06-21
I'm calling an include at the very top of my code:

includes/page_top.php

i've got this line of code in includes/page_top.php:

<?php if ($crumb2=="wirtzer") echo "Active";?>

now, in the code of the page that is calling includes/page_top.php, i'm defining the crumb2 variable: i.e.:

<?php $crumb2="wirtzer";?>

my issue is that i'm getting server errors (not on the php page but in the log files) like this one:


[Sat Feb 05 10:03:06 2011] [client 76.168.200.119] PHP Notice:  Undefined variable: crumb2 in /home/derm/includes/submenu-forms.php on line 3

i'm guessing this is because includes/page_top.php loads before the rest of the code containing the actual crumb2 variable definition. can i define a default crumb2 variable in includes/page_top.php? so i don't keep getting these errors?




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Question by:phillystyle123
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3 Comments
 
LVL 83

Expert Comment

by:Dave Baldwin
ID: 34948060
The definition needs to come before the 'include' or at least before the 'if'.  You can define and re-define it wherever you want.  It just has to be defined when you try to use it like in the 'if' statement.
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Accepted Solution

by:
Ray Paseur earned 2000 total points
ID: 34951122
This message is a Notice, not an Error:

[Sat Feb 05 10:03:06 2011] [client 76.168.200.119] PHP Notice:  Undefined variable: crumb2 in /home/derm/includes/submenu-forms.php on line 3

In the default installation of PHP, Notices are suppressed.  That means that you can use undefined variables as if they were NULL.  However you have error_reporting() set to display the Notices.  

You can handle this two ways.  You can set error_reporting(E_ALL ^ E_NOTICE) or you can test the variables to see if they are set before you try to use them in other expressions.  The second practice is better from the computer science standpoint.

A third way is to deliberately define the variables with a default value, then overwrite the default value with the data from whatever source you choose.
<?php // SHOW HOW TO HANDLE POTENTIALLY UNDEFINED VARS
if (isset($crumb2))
{
    if ($crumb2 == "wirtzer") 
    {
        echo "Active";
    }
}
?>

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Author Closing Comment

by:phillystyle123
ID: 34975738
thank you!
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