ini_set('error_log', $custom_error_log_location);
print ini_get('error_log');
The result of the above code? Nothing! It literally prints nothing as the value of ini_get('error_log'). I'm running this on an Apache server. I investigated the Apache configuration for my website. The Apache configuration has its own error log setup through the ErrorLog directive. Here's the thing: I'm running another website on the same server, with a similar Apache configuration, and on that site I CAN specify a custom error log in PHP.
I also checked the site's php.ini file. Nothing on logging there. What I want to know is, is there some configuration in either Apache or php.ini that would prevent me from modifying where the error log file is located?
If safe_mode or open_basedir are in effect, ini_set("error_log") is restricted by those settings (because you can write anything in the opened file with error_log()).
The restriction covers both runtime and .htaccess, but you can use the php_value directive to set it in the virtual host configuration file.