PHP is quickly becoming one of the most popular general purpose scripting language due to its specific design for web development. In addition, there are many user-friendly features that make it attractive for new programmers.

Unfortunately accompanying these features is the ability for developers to inadvertently include security holes in an application. While PHP can be as safe as any other language, without understanding the procedure makes these security holes avoidable.

There are many security software problems that may arise during the development of an application. The main problems are validated input errors, the session ID protection, cross site scripting (XSS) flaws and defects of access control.

Entry errors – The most common PHP security issue is certainly not validated input errors. These data are provided by users, therefore a security measure is to assume that each user has some sort of evil intent. To combat this problem, validate all user-supplied data with the exception of the expected data. In general, the most restrictive way possible and if certain pieces of data should not be included, reject the code.

ID of the session – A session ID is a unique identification number for each user session. Unfortunately, if the session ID is discovered by another user that can hijack the session and see information confidential. This can be a significant security risk PHP web sites, especially those that the number of credit card processing. Using a secure SSL connection will help reduce this type of vulnerability.

Cross Site Scripting Flaws – These errors occur when a malicious user script includes commands specific data that can be seen and activated by another user. The best way to prevent this type of attack is to avoid showing the user submits the content word for word on a website. Another technique is to filter out harmful content labels when first added.

Defect Control – The final guarantee is PHP programming question of access control failures. These failures occur when specific sections of an application is restricted to specific users. This is commonly found in the pages of administration which include configuration options and other confidential information. To defend against this threat, check the user privileges on each page load restricted and the layer of security.

These are four of the many security problems found in PHP web sites. Can be easily fixed, but if not detected upstream can wreak havoc on the website and server. The best method of protection is to review the code for all the holes and always assume that all users have malicious intentions.