Apache logging related settings_PHP tutorial

<span Level Description Example  
emerg 紧急 - 系统无法使用。 "Child cannot open lock file. Exiting" Ddpw}'q\  
alert 必须立即采取措施。 "getpwuid: couldn't determine user name from uid" % Ui_a]Z  
crit 致命情况。 "socket: Failed to get a socket, exiting child"  
error 错误情况。 "Premature end of script headers"  
warn 警告情况。 "child process 1234 did not exit, sending another SIGHUP" OP6FkB? 9  
notice 一般重要情况。 "httpd: caught SIGBUS, attempting to dump core in ..."  
info 普通信息。 "Server seems busy, (you may need to increase StartServers, or Min/MaxSpareServers)..."  
debug 出错级别信息 "Opening config file ..."  </span>