Update safemysql.class.php

Hey colonel, I changed your class now (a lot) the way I wanted it to be. So don't missunderstand me .. it's still an act of respect. I thought if we are writing emails all the time you will never get what I am trying to say (maybe because of my bad english skills).
I think the code says more about my ideas. I also edited the description on the top of the php-file, so that you know how it works now.
So here it is … I hope to hear from you soon! (you can write me an email)

C H A N G E L O G   AND QUESTIONS:

ATTRIBUTES: set all private to protected for extending the class

NAMING: "getCol" looks like procedural style of function names, so I changed it to "get_col". changed every function name this way. renamed it like mentioned in the email

ADDED destructor: added mysqli_close

WHY DON'T YOU USE OOP-MYSQLI?
(I didn't change it because I don't understand the "@" at @$this->conn)

ADDED get_auto_increment() method to get the current auto-increment-value of a table, but it doesn't work … why? Because you answered my question about this on stackoverflow recently … I think you can ignore this. think I have to change a lot of code in my system :(

REMOVED unnecessary brackets in if-statements

QUESTION: What does "escape_ident($value)" do? Because it replaces every ` with `` inside $value AND adds ` at start and end of $value. So "word" will become "`word`" and "`something`" will become "```something```"! .. is that right? (i don't think so)
REPLACED “return "`".str_replace("`","``",$value)."`";” with “return "`".str_replace("`","",$value)."`";”

CHANGED escape_int, so that it accepts integer-arrays too!

CHANGED escape_str, so that it accepts string-arrays too!

CHANGED escape_ident, so that it accepts arrays too!

REMOVED createIN and createSET
ADDED create_writevals and create_update instead