Shell script code: show oldest | newest file in folder and file age 2

Shell script code: show oldest | newest file in folder and file age
Determining Oldest file and file age Today I had to write a short shell script to help figure out the oldest file in a particular folder, how old that file was (in secs or minutes). This is a pretty common requirement when dealing with file(s) folders  such as working directories, where you periodically need to ...

Websockets : PHP code complete tutorial client & server 44

Websockets : PHP code complete tutorial client & server
Step-by-step to build a simple HTML5 using a PHP server for true server-push websocket communications I’m going to demo how you can create a simple and easy echo server, and communicate bidirectionally with various web clients.  The ability for the server to send (or “push“) communications to the client (browser) at any moment provides a ...

HTTP long poll example in php ajax 4

[icon name=”paper-plane” class=”” unprefixed_class=””] UPDATED: A better and easier way to do this is via Server Sent Events, Check out my recent post. Simple and easy PHP example of how to integrate long-polling (“hanging GET”) to simulate server PUSH and add more dynamic content to your web pages. As a standard HTTP is terrific protocol ...

Palindrome algorithms: What’s fastest reverse vs. compare. 1

Palindrome algorithms: What's fastest reverse vs. compare.
Today during a meeting a simple coding question came up as to how to write a palindrome function.  A palindrome is a word, phrase, number, or other sequence of symbols or elements, whose meaning may be interpreted the same way in either forward or reverse direction.[1]  Examples: mom , level, radar, tenet … There are quite a few programmatic solutions ...

Code Sample: PHP Javascript Currency converter + exchange rates caching RSS feed 28

Code Sample: PHP Javascript Currency converter + exchange rates caching RSS feed
Problem: For a recent project I needed to get the latest exchange rates to allow the sales folks to quickly calculate costs  while doing estimates in different currencies. There are many sites online where you can do this, but we wanted to create an in-app widget that could be re-used on various internal  pages. The ...

Code Sample: PHP Backup MySQL and files to Dropbox 16

Code Sample: PHP Backup MySQL and files to Dropbox
Most web hosts have the ability via their control panel to offer an entire site backup , and this is the minimal functionality you  should consider. Generally there’s a site backup link within the control panel that create a tar ball (.zip file)  of the entire site and its contents. then you can email,or simply download ...

Twitter like alerts via simple Jquery and PHP 3

Twitter like alerts via simple Jquery and PHP
One of the minor challenges of creating a web application , is to indicate that something was successfully or unsuccessfully  completed when transitioning to a new page or screen. I find it’s very important and reassuring to let user’s know what has happened , whether it worked or whether there was a problem. Typically a simple status message would ...

html5 – javascript game frameworks? – Game Development

html5 - javascript game frameworks? - Game Development
HTML5 Gaming I’m beginning to look into various html5 javascript game and graphics frameworks.  The toughest part is always choosing a good framework in the beginning, since its such a time investment to learn a new API , plus hope that the framework is popular enough so bugs are fixed quickly and it matures rapidly.   This ...

Code Samples – Preventing simultaneous web updates 3

Code Samples - Preventing simultaneous web updates
Below are some interesting problems and solutions that I have come accross. Problem: In a web based system how to you prevent simultaneous web updates (aka overwrites) to the same record by different users seeing potentially different data. This is a play on the old airline reservation problem you find in older computer science text books. If ...