error notice: Constant DB_NAME already defined in

i have file which both show a form and validate it. when showing the form everything is ok, but when i press the submit button so it validate the form, here i got error although the form is well validated, the error is :

notice开发者_开发百科: Constant DB_NAME already defined in C:\wamp\www\ssiphone\ss-config.php on line 15

THX for help :)

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You might be using include or require instead of include_once or require_once.

If the file where DB_NAME is declared is being included more than once it would throw that error. Otherwise you may just have multiple declarations in your code.

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I think you've used, include or require to include the file and the file may contain constant value. Replace with,

require_once("FILE_PATH");

or

include_once("FILE_PATH");

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It means exactly what it says. You're defining a Constant called DB_NAME, and then trying to define it a second time. Look for this in files that you're including, which you should only be including once.... because my guess would be that you're defining in an included file.