Protocol Relative URLs

Posted in: html |  

18 Apr 2012

One little gem I recently encountered is protocol-relative URLs. This solves the headaches of the age-old problem of creating URLs which work whether you’re in SSL mode or normal http. For example take the following image :
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PHP 5.4.0 in a nutshell

Posted in: php |   ( 4 ) Comments

6 Apr 2012

Although purists have always sneered upon PHP for being a “patched” language; the evolution of PHP over the years, with new features added in every version, has only increased its popularity. The latest 5.4 release has followed the trend with some major feature additions. The following post describes some important changes in PHP 5.4.
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Printing web pages from JavaScript, although not a common scenario, can be easily accomplished with some simple code. On the other hand, selectively printing some elements from a web page – like a div or a paragraph, can be challenging. Fortunately there are libraries available that can make the task easier. One such useful jQuery plugin is jQuery PrintElement, which allows you to selectively print a DOM element. Usage is extremely easy; just select any element from a webpage and fire the ‘printElement’ method.
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For any moderately complex web application a help section is mandatory. Most of us rely on displaying the help in a popup or a different window. One other interesting way is to display the help section beneath the main window, which then slides to display the help section below.
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Changing the domain name or URL of a WordPress site, whether from local server to a live or vice versa, can be a frustrating and time consuming task. One nice script I found helps ease that process considerately. WordPress-Domain-Changer is a simple PHP script that lets you quickly change domains of your WordPress installation.

The script basically works by replacing the old domain name strings in the ‘wp_options’ table with the new values. It will also replace any references to the old domain name in post content with the new domain name. Upload paths will also be changed.

Rendering PDF in HTML5 Canvas

Posted in: html,javascript |  

19 Feb 2012

pdf.js is an HTML5 technology experiment from Mozilla that explores building a faithful and efficient Portable Document Format (PDF) renderer using Canvas without any native code support. The goal of the project is to create a general-purpose, web standards-based platform for parsing and rendering PDFs, and eventually to release a PDF reader extension powered by pdf.js. Integration with Firefox is a possibility if the experiment proves successful.
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In the last post we constructed a graph structure using the Structure_Graph Pear library. But building a graph is not enough; we also need the ability to search through it. To make it easier to build search algorithms, it is useful if we can represent the graph and its connections in a different way; adjacency matrix being one such representation.


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undirected graphGraphs are one of the most frequently used data structures,along with linked lists and trees. In a recent PHP project I needed to build a Graph structure to analyze some interlinked urls. The problem was of a simple nature, so rather than writing my own code, I went with the one available in the Pear repository.

The Pear Structures_Graph package allows creating and manipulating graph data structures. It allows building of either directed or undirected graphs, with data and metadata stored in nodes. The library provides functions for graph traversing as well as for characteristic extraction from the graph topology.
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The ebook has moved to leanpub.

The ebook has moved to leanpub.