I have very limited access to settings on my server, so I need to manually set ini_set('log_errors', 1); in my scripts. But can I in same way change the path to the error_log file, to have it in my reach?
The manual says it's PHP_INI_ALL, so you can set it at runtime.
Notably that'll have no effect to any messages generated prior calling ini_set.
Better option would be to use one of the SAPI-dependant configuration schemes (.user.ini or .htaccess)
Also take in mind that the destined log path needs to be writeable by the Apache or FPM process, of course.