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Using $base_url to build a link in a computed field, I get this error:

Notice: Undefined variable: base_url in eval() (line 1 of F:\wamp\www\mysite\sites\all\modules\computed_field\computed_field.module(468) : eval()'d code).

Is it a way to get the site base URL in a computed field?

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This is a global scope variable and you can access it by using $GLOBALS['base_url'] instead or calling the core base_path() function to pull it into your computed field definition.

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Before using $base_url, You need to declare it just like below

global $base_url;

After declaring you can use $base_url in your code.

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