Files with the extension PHP3 are Hypertext PreProcessor Script files in version 3.
PHP is a scripting language that runs on a web server, producing output in the form of HTML pages. PHP has many features that simplify collaboration with databases such as MySQL and allow you to build rich web applications such as content management systems.
Since PHP is an open source project, it has become very widespread and is used on many websites. Applications range from simple forms to complex management systems and shops.
Files with the extension PHP3 can contain pure PHP source code as well as this embedded in an HTML. It is similar to ASP, CGI or JSP.
To edit a PHP3 file, just use a text editor. But there are also complete development environments that greatly simplify the development of PHP scripts.
The extension PHP3 or php in a URL (in the address line of a browser) indicates that PHP is being used on the website. The user of the website receives only the PHP script generated HTML document, not the actual PHP script.
The usual extension for PHP files is php. The version in the extension is not obligatory. However, if used for referencing, it must of course persist.
Most often resolving problems with opening PHP3 files is very simple. Just install an appropriate program that supports such files. All of the listed programs support PHP3 files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of PHP3 files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate PHP3 files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the PHP applications is not on the list, select "Browse" option in order to manually locate the directory where PHP has been installed.
Sometimes problems with opening PHP3 files may not lie with the application itself, but can arise due to other causes, such as: