What is Wi-Fi and how secure is it?

Feb
04

1. Overview

Wi-Fi, (or Wireless Fidelity) is a wireless LAN technology which allows Wi-Fi equipped computers to connect to the Internet from anywhere within the range of a base station. Wi-Fi encompasses a family of specifications within the IEEE 802.11 standard. These include 802.11b (the most popular, at 11Mbps, with typical range of up to 300 feet), 802.11a (54Mbps, but at a shorter range) and 802.11g (combining the speed of "a" while keeping the range of "b").

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Perl string quotation operators (q, qq, qr and qx)

Feb
04

In scripting programming languages such as perl, php and python use string quotation extensively. To include single or double quote inside the string quotation, you'll have escape the character with a backslash. Perl string quotation operators (q, qq and qx) let you avoid putting too many backslashes into quoted strings.

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How to install mod_php5 on SuSE 11.1?

Feb
04

Installing apache2, php5 and mod_php5 shouldn't be too hard, but it took me nearly 2 hours trying to get this installed on SuSE v11.1. The later SuSE 11.4 works just fine by installing the required modules with zypper, but the SuSE 11.1 wouldn't work right out of the box.

Here are the steps required to get the mod_php5 to work on SuSE 11.1. The v11.1 installs php5-5.2.6 where v11.4 installs php5-5.3.5. We had to downgrade the php due to package dependency issues.

1. Add official OpenSuSE repository

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SuSE package manager, zypper

Feb
04

I have recently acquainted with SuSE linux, and I looked for package manager that I can use to manage software packages. I've started out with yast, but it wasn't very good at providing resolutions to dependency problems. Someone recommended zypper over yast and yast2, so here I am sharing my experience with zypper.

What is Zypper?

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Previsor PHP assessment test

Feb
04

With more and more companies using pre-employment screening test such as the one provided by Previsor, LAMP developers and PHP developers should hone their technical skills to prepare for their next career. Having taken one, Previsor assessment test resembles College Board Tests such as the ACT and SAT, which tests students' general understanding of the subject (in this case "PHP"). PHP, especially version 5, is a great scripting language to develop web applications very rapidly with a minimum effort.

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Javascript Overview

Feb
04

What is Javascript?

JavaScript is an object-oriented scripting language designed to be embedded in HTML pages for added interactivity and offer intelligence to web pages. JavaScript provides a set of objects (Array, Date, and Math), language elements (Operators, Conditional Controls, and Statements). Javascript is primarily used in client-side to control the browser elements and HTML Document Object Model (DOM) to offer interactivity to users.

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PHP File Upload

Feb
04

PHP provides file upload variable, $_FILES associative array, to permit file upload to an web server. To upload a file to the server, an HTML form must be composed to allow a user to select a file from local filesystem to upload.

HTML Form: Create a HTML file with the following content, and call it form.html.

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How to change the date.timezone in Linux/PHP?

Feb
04

If your date.timezone is not properly set, your web application will not display your local time correctly.  The default date.timezone will be set to the server time zone. If you (or your company) is located in different time zone from the server, you may have to override the value in your PHP application.. The date.timezone can be set at the system level, PHP level or application level.

Linux Server Timezone

To set the date.timezone value globally within the server, you'll have to follow the steps outlined below.

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How to name a facebook fan page?

Feb
04

Setting up a business page under your Facebook account is an integral part in building a traffic to your "business" website. Facebook allows a business to setup a vanity url (or username), such as the facebook.com/webtrafficexchange, but it seems to be a mystery for many and it isn't clear how to claim your business username.

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How to identify Commercial Cards using BIN numbers?

Feb
04

The first six digits of each credit card account number is called the Bank Identification Number (BIN) and the next three digits determine the card type. The first nine digits of credit card numbers allow merchants to identify card-issuing institution and what type of credit card is being used.

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