Update mysqlnd_azure_log.md

doc/mysqlnd_azure_log.md

@@ -6,7 +6,7 @@ Log down some runtime information from mysqlnd\_azure.
 
 ### Log destination supported (mysqlnd\_azure.logOutput)
 
-**Notice**
+**Notice:**
 For all the file paths mentioned below, except Apache and php-fpm's system error log, it need to be configured with right user permission, e.g. www-data for Apache. For relative file path, when working in cli, the father path is the current working directoy, when working with Apache, the father path is /.
 
 We provide multiple options for log destination you may want to choose. 
@@ -22,17 +22,17 @@ Dynamic | No
 
 Value | Behavior | Sample log
 :----- | :------ | :----- 
-0 | Like logLevel control, it will turn off the log. No log will be print out | 
-1 | Print logs using PHP error log API. <br/> PHP CLI: Print to console <br/> Work scenario with Apache/Nginx: Will be discussed in seperated section below |  Warning: mysqli_real_connect(): [2020-07-20 14:09:03] [MYSQLND_AZURE] [ERROR] CLIENT_SSL is not set when mysqlnd_azure.enableRedirect is ON in mysqli_basic.php on line 6
-2 | Print logs to a pre-defined file by mysqlnd\_azure's config mysqlnd\_azure.logfilePath=xx.log | [MYSQLND_AZURE] [ERROR] CLIENT_SSL is not set when mysqlnd_azure.enableRedirect is ON
-4 | Print logs using stderr. <br/> PHP CLI: Print to console <br/> Work scenario with Apache/Nginx: Will be discussed in seperated section below | [MYSQLND_AZURE] [ERROR] CLIENT_SSL is not set when mysqlnd_azure.enableRedirect is ON
+0 | Like logLevel control, it will turn off the log. No log will be print out. | 
+1 | Print logs using PHP error log API. <br/> - PHP CLI: Print to console. <br/> - Work scenario with Apache/Nginx: Will be discussed in seperated section below. |  Warning: mysqli_real_connect(): [2020-07-20 14:09:03] [MYSQLND_AZURE] [ERROR] CLIENT_SSL is not set when mysqlnd_azure.enableRedirect is ON in mysqli_basic.php on line 6
+2 | Print logs to a pre-defined file by mysqlnd\_azure's config mysqlnd\_azure.logfilePath=xx.log. | [MYSQLND_AZURE] [ERROR] CLIENT_SSL is not set when mysqlnd_azure.enableRedirect is ON
+4 | Print logs using stderr. <br/> - PHP CLI: Print to console. <br/> - Work scenario with Apache/Nginx: Will be discussed in seperated section below. | [MYSQLND_AZURE] [ERROR] CLIENT_SSL is not set when mysqlnd_azure.enableRedirect is ON
 
 #### Detailed behavior for logOutput1 and logOutput4
 - **For mod-php and Apache (take php7.2 as example)**
 
 Config file | Config options | Usage
 :----- | :------ | :----- 
-/etc/php/7.2/apache2/php.ini | -error_log <br/> -log_error <br/> -display_errors | This file is Apache mod_php's config file s <br/> -log_error: logOutput1 is only available if this is on. <br/> error_log: where logOutput1 goes into. <br/> --1.	error_log=syslog:  logOutput1 is not available with this option. <br/> --2.	error_log=A_file_path. It will take priority of apache’s error log setting. <br/> display_errors: Whether print logOutput1 to a client web page.
+/etc/php/7.2/apache2/php.ini | error_log <br/> log_error <br/> display_errors   | This file is Apache mod_php's config file s <br/> -log_error: logOutput1 is only available if this is on. <br/> error_log: where logOutput1 goes into. <br/> --1.	error_log=syslog:  logOutput1 is not available with this option. <br/> --2.	error_log=A_file_path. It will take priority of apache’s error log setting. <br/> display_errors: Whether print logOutput1 to a client web page.
 /etc/apache2/sites-available/000-default.conf | ErrorLog | This file is Apache's error log path for seperated virtual instance. <br/> If error_log is not set in php.ini above, logOutput1 will go here.
 /etc/apache2/apache2.conf | ErrorLog | This file is Apache’s global error log path. <br/> logOutput4 goes here. <br/> If ErrorLog is not set for each virtual host, and error_log is not set in php.ini, then logOutput4 also goes here.
  
@@ -41,11 +41,12 @@ Config file | Config options | Usage
  Config file | Config options | Usage
 :----- | :------ | :----- 
 /etc/php/7.2/fpm/php-fpm.conf | error_log	| This Php-fpm’s system error log, has content like php-fpm is restarted or crashed. <br/> -- logOutput4 will go here if catch_workers_output = yes in www.conf. <br/> logOutput1 will also go here if catch_workers_output = yes in www.conf && log_errors=ON && error_log is not set in php.ini and www.conf below.
-/etc/php/7.2/fpm/php.ini | - error_log <br/> - log_error <br/> - display_errors	| - error_log: The destination logOutput1 goes to. <br/> - log_error: same with mod_php. <br/> - display_errors: same with mod_php.
-/etc/php/7.2/fpm/pool.d/www.conf	| - catch_workers_output <br/> - php_admin_value[error_log] <br/> - php_admin_flag[log_errors] - php_flag[display_errors] | - catch_workers_output: <br/> Whether catch logOutput4 and logOutput1. <br/> -- php_admin_value[error_log]: <br/> -- php_admin_flag[log_errors]: <br> -- php_flag[display_errors]: <br/> Same as that in php.ini, but the definitions here take priority.
+/etc/php/7.2/fpm/php.ini | error_log <br/> log_error <br/> display_errors	| - error_log: The destination logOutput1 goes to. <br/> - log_error: same with mod_php. <br/> - display_errors: same with mod_php.
+/etc/php/7.2/fpm/pool.d/www.conf	| catch_workers_output <br/> php_admin_value[error_log] <br/> php_admin_flag[log_errors] <br/> php_flag[display_errors] | - catch_workers_output: <br/> Whether catch logOutput4 and logOutput1. <br/> <br/> -- php_admin_value[error_log]: <br/> -- php_admin_flag[log_errors]: <br> -- php_flag[display_errors]: <br/> Same as that in php.ini, but the definitions here take priority.
 /etc/apache2/sites-available/000-default.conf	| ErrorLog	| logOutput1 will go here if the error_log is not set in php.ini and www.conf. <br/> Please notice that the logs for single request is in single line since fastcgi treat one request’s log as single line)
 /etc/apache2/apache2.conf	| ErrorLog	| Apache’s global error log path. <br/> logOutput1 will go here if the error_log is not set in php.ini and www.conf and ErrorLog is not set in each virtual instance
 
+Work scenario with Nginx is similar.
 
  ### mysqlnd\_azure.logfilePath
 
@@ -56,7 +57,7 @@ Type | String
 Accepted Value | String length <= 255, legal filename string
 Default | mysqlnd\_azure\_runtime.log
 Dynamic | NO
-Note | 1. This variable is not dynamic, only can set in php.ini, not possible by `ini_set('mysqlnd_azure.logLevel', '$VAL'); ` <br> 2. Filename length cannot exceed the file system's restriction(255), otherwise system will use the default filename and throw a warning "Given logfile name too long, redirected to default: mysqlnd_azure_runtime.log"
+Note | Filename length cannot exceed the file system's restriction(255), otherwise system will use the default filename and throw a warning "Given logfile name too long, redirected to default: mysqlnd_azure_runtime.log"
 
  ### mysqlnd\_azure.logLevel
 Name | mysqlnd\_azure.logLevel
@@ -66,6 +67,7 @@ Type | Enumeration
 Accepted Value | [ 0 \| 1 \| 2 \| 3 ]
 Default | 0 (OFF)
 Dynamic | Yes
+Note | This variable is dynamic, you may use user srcipt API `ini_set('mysqlnd_azure.logLevel', '$VAL'); ` to check log with different verbose level.
 
 ### Loglevel supported
 we support 3 level of logs for user: