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  Some tricks on PHP session

1. Session timeout problem There is a nuance we found with session timing out although the user is still active in the session.  The problem has to do with never modifying the session variable. The GC will clear the session data files based on their last modification time.  Thus if you never modify the session, you simply read from it, then the GC will eventually clean up. To prevent this you need to ensure that your session is modified within the GC delete time.  You can accomp...

10,051 4 0          PHP SOLUTION SESSION TIMEOUT VARIOUS DOMAIN


  Workaround size limit of phpMyAdmin import sql file

When doing website development with MySQL, we often need to do database backup and restore. For website, the data in database will grow quickly, so when we back up the database, the size of the generated sql file may be over 80MB which is the max allowed size when we want to import a sql file for restoring our database using phpMyAdmin. To workaround this limit, we need to review the documentation of phpMyAdmin. Fortunately, I found an online article written by David Pratt  which gave us a ...

7,589 0 0          MYSQL SOLUTION PHPMYSQLADMIN 80M IMPORT LIMIT


  One reason why mcrypt responds slowly

This morning one colleague came over and talked about one script which used mcrypt responded very slowly, the server configurations are fine. But the reason for the slowness is unknown. Here is one script which reproduces the issue: <?php $dmcryptText = "dummy"; $key = "foobar"; $size = mcrypt_get_iv_size(MCRYPT_BLOWFISH,MCRYPT_MODE_ECB); $iv = mcrypt_create_iv($size); //Take care $m = mcrypt_ecb(MCRYPT_BLOWFISH, $key, $dmcryptText, MCRYPT_DECRYPT, $iv); var_dump($m); When 20 requests of&...

6,513 8 0          PHP SOLUTION SLOW MCRYPT RESPONSE


  Show drop down list or menu above of a flash in webpage

How to make a drop down menu show above of a  flash in webpage?Normally when we embed a flash or swf file into our webpage, it is not one component of our webpage.So sometimes the flash will always show above of the webpage, it will not interact with our HTML page.To solve this problem,we need to use wmode property of object tag.wmode has three properties: window,opaque and transparent.window : the flash will show in its own rectangular window,which will not interact with    ...

2,020 0 0          HTML FLASH SOLUTION DROP DOWN MENU BLOCK


  QScrollArea Scrollbar Display Solution

Qt framework is a popular C++ GUI framework developed by Nokia. And it is also cross platform compatible. Many developers are using Qt to develop C++ GUI programs. In Qt, some important components are deserved our close attention. Many developers faced the problem when they put some widgets in a QScrollArea widget and they want it to display scroll bars when the widgets inside the QScrollArea overflows. After many experiments, I propose a way which can show scroll bars as you expected. The...

7,918 2 0          C++ SOLUTION GUI QT QSCROLLBAR SCROLLBAR NOT DISPLAY


  Slow Datagridview... Oh No!

So we all have been here, I had finished a project using VS2008, implementing  Datagridviews on litterally each and every form of the system. This had been a requirement from the onset as to ensure easy searching,navigation and capturing of data. So the data capture ladies start doing their thing and low and behold the dreaded call... they are unhappy with the speed of the DataGridView. I had to agree with them, the repaint of the and overall perfromance of the grid is ...

3,429 0 0          C# SOLUTION SLOW DATAGRIDVIEW


  A Solution to CPU-intensive Tasks in IO Loops

Back in October 2011, Ted Dziuba infamously said that Node.js is Cancer.  A provocative title to a provocative article.  The only thing it didn’t really provoke in the commentary was much thought ;)  Zing. My interpretation of the article is that Ted holds up the classic blocking-IO process-per-request (or  thread per request; same difference) model as superior.  Yet we all remember where the blocking-IO forking model got Apache in the early days.  So I...

1,967 0 0          C++ SOLUTION CPU INTENSIVE IO LOOPS


  Why is my IP blocked at a website I visit regularly after I changed ISPs?

I just installed a new Express Card with Verizon Broadband wireless last night. Had tons of fun accessing the web from places I usually cannot, (we are in trucking) until I got to my favorite forum. It's a public place I have been to thousands of times, but instead of happily browsing all the daily news events and checking to see if the world blew up yet, I found myself blocked by a big white screen that said YOUR IP ADDRESS HAS BEEN BANNED. What can I do? I can't go to the forum owners to ...

1,612 0 0          SOLUTION ISP IP BLOCK STOPFORUMSPAM