Why is the script causing the error 500?

Hello! Question: added a working script line
mkdir ('var/www/danila_p/data/www/test1.redcap52.EN);

after that, the script stopped working after running the script the console shows the error:
Syntax error , unexpected 'var' (T_VAR) on line ...
What is the problem and how to fix it?
July 2nd 19 at 17:49
1 answer
July 2nd 19 at 17:51
mkdir ('var/danila_p/data/www/test1.redcap52.EN');

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