Error on page after deployment of Wikipedia

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Notice level, should not affect the operation, you can suppress the output on the php.ini line
Have the ability to find out what that attribute value is, redefine it.

How to change the INI? Suppress output

Before the program
Error_reporting (e_all ^ e_notice);

or php.ini (not recommended)
error_reporting = e_all ^ E_notice

Wikipedia has a wide spread and makes such a low-level mistake.
How important it is to write robust code.

Can you get a little more detailed? I'm a C + + file that's under that path and search for this error_reporting (e_all ^ e_notice);
Change to error_reporting = E_all ^ E_notice on the line?

In the C:\xampp\htdocs\mediawiki (the picture is too small, want to see the wrong), find the config.php or file name contains config files
If not, then look at the index.php file in that directory.
or "search" config in the directory

Find the first one after this file

Add it to the index.php.

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