Hi ,
Is there any variable to check 404 error on site. I want to customize page for that.
See https://www.opensource-socialnetwork.org/wiki/view/1137/how-to-find-a-string-a-pattern-of-words-in-the-source-code
Please understand that the core team is unable to tell you the exact location of every var and function. Today you're asking for function a, tomorrow you might ask for function b ... and it'll never stop.
Use the documented procedure instead, and you'll find it's really simple and just a few steps.
Use a preferably unique search pattern, in this case
1. The page you requested
which will lead you to the language file ossn\locale\ossn.en.php
2. page:error:text
in the language file (besides 2 other language files) leads to ossn\system\plugins\default\pages\contents\error.php
And voila, there's the code you're searching for.
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