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HTTP long poll example in php ajax

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May

11

2013

[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 ...

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

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Apr

1

2013

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

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Jan

21

2013

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

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Jan

14

2013

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 ...

Sample Code: Quick and Dirty PHP Cache

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Sep

21

2012

Here’s a variation of a PHP caching script. One of the things I frequently find myself doing for page(s) that take a long time to render, especially if they are a long running process, is to generally save a recent cached page (or more specifically) cached content and serving that up, when I need to have an immediate page ...

Sample Code: prevent web page overwrites

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Jul

8

2012

Below are some interesting problems and solutions that I have come accross. Problem: In a web based system how to you prevent multiple updates 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 there is one ...

Sample Code: Basic Login , Roles authentication and Login attempt alerts.

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Mar

28

2012

Problem: In most web based system one of the most commonly used process is user authentication and page access. This Login function is pretty typical here’s my example: Notice I set a bunch of session variables that I frequently use later in the application to display specific user information (such as dashboards etc.) <?php /////// ...