Cannot install WP to domain with open_basedir

[azurit]

WordPress cannot by installed to domain which has it's DocumentRoot in open_basedir, for example:
DocumentRoot = /var/www/www.example.com/
PHP open_basedir = /var/www/www.example.com/

This error is printed:

Warning: file_exists(): open_basedir restriction in effect. File(/var/www/wp-config.php) is not within the allowed path(s): (/var/www/www.example.com/:/tmp/:/usr/share/php/:.) in /var/www/www.example.com/wp-load.php on line 31

Warning: Cannot modify header information - headers already sent by (output started at /home/testtest/djangoproject.sk/wp-load.php:31) in /var/www/www.example.com/wp-load.php on line 56

This is because WP is searching for wp-config.php also in one level above the DocumentRoot. I suggest to remove this feature or make it configurable (and disabled by default) or count with open_basedir and continue with installation as if file_exists returns false.

[SergeyBiryukov]

Duplicate of #29680.