3 types of logs in php apache server

The format of the error described here is common for Apache web servers. That means that we can also look for common error logs. Once again, the location of these logs varies a great deal based on the specific web server configuration.

• access_log is the log of successful accesses. On a shared or virtual hosting server, there may be many of these: one per website, often with site-specific names or in site-specific locations on the server.
• error_log is the log of errors. On some hosts, there is an error log per site. On others, each site may have its own access_log, but there may only be a single error_log for the system.
• suexec_log is the log that most people forget. It deals with the permissions used to execute CGI and other scripts. When a CGI fails to execute because its ownership is wrong, the generic internal server error shows in the error log, but a more specific error detailing the permissions involved appears in this log.