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.
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.
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.
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.
Graphs 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.
One of the features lacking in the current browser api is that of determining whether the web page is currently visible to the user or is hidden (either in another tab or window).
Check the below demo page to see how this works. The demo was tested in Safari, Opera 11.10, Chrome and Firefox.
It seems that some common elements of programming stump us from time to time. Take the task of filtering a input search string in PHP to remove unwanted characters. Using a RegEx many developers find it easy to search for a substring, but find it difficult to use the same to reject some particular characters from a string. A simple solution is shown below, which rejects all the characters from the input except alphanumeric and a space.