Online chat solutions have been very popular long before AJAX was born. There are numerous reasons for this popularity, and you're probably familiar with them if you've ever used an Internet Relay Chat (IRC) client, or an Instant Messenger (IM) program, or a Java chat applet.
AJAX has pushed online chat solutions forward by making it easy to implement features that are causing trouble or are harder to implement with other technologies. First of all, an AJAX chat application inherits all the typical AJAX benefits, such as integration with existing browser features, and (if written well) cross-platform compatibility.
An additional advantage is that an AJAX chat application avoids the connectivity problems that are common with other technologies, because many firewalls block the communication ports they use. On the other hand, AJAX uses exclusively HTTP for communicating with the server.
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PHP AJAX chat and JSON Tutorial
PHP Advanced Tutorial
In this tutorial you will learn :
* PHP-MySQL
* Cookie Handling
* Dynamic Images
* PDF
* Flash
* Sessions
* Security
* Tips & Tricks
* Optimization
* Latest Developments
* Future
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PHP Security Guide
The PHP Security Guide is the flagship project of the PHP Security Consortium. This guide offers detailed information pertaining to a number of common security concerns for all PHP developers.
Security is a measurement, not a characteristic.It is unfortunate that many software projects list security as a simple requirement to be met. Is it secure? This question is as subjective as asking if something is hot.
Security must be balanced with expense.It is easy and relatively inexpensive to provide a sufficient level of security for most applications. However, if your security needs are very demanding, because you're protecting information that is very valuable, then you must achieve a higher level of security at an increased cost. This expense must be included in the budget of the project.
Security must be balanced with
usability.It is not uncommon that steps taken to increase the security of a web application also decrease the usability.Passwords, session timeouts, and access control all create obstacles for a legitimate user. Sometimes these are necessary to provide adequate security, but there isn't one solution that is appropriate for every application. It is wise to be mindful of your legitimate users as you implement security measures.
Security must be part of the design.If you do not design your application with security in mind, you are doomed to be constantly addressing new security vulnerabilities. Careful programming cannot make up for a poor design.
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