LAMP_ENV

PHP
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(1)tail -f /home/ubuntu/lib/apache2/log/error.log
   This log is not very helpful and outdated.
   It does not have PHP application related errors.
   But, any hint will save me a day.
   Keep looking.
   
 (2)php_errors.log seems to be creating at thc current directory.
    This log seems to capture all stdout errors to this file.
    

SQL
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mysql-ctl cli

use dblogin;
show tables;

mysql credential
username:dguai
password:""   <=Empty string

LINUX
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(1)Ubuntu release
lsb_release -a

(2).profile exists on home directory
must source ~/.profile after a change 

(3)Home directory is /home/ubuntu/workspace

//USE very cautiously.
Run this first: find .  -name "php_errors.log" -type f 
find .  -name "php_errors.log" -type f -delete