Prevent search engines from crawling and indexing your website
All search engines have automatic web crawlers that are constantly browsing the internet in order to keep their search results up to date. Unless you specifically configure your website to disallow them, they will eventually find you and list you in their search results.
To disallow these crawlers(robots) from crawling your website, just create a file called “robots.txt” with the following data.
User-agent: *
Disallow: /
Upload the “robots.txt” file to the root of your website and it will prevent the crawlers from crawling your website.
You can also use meta tags to prevent the robots from crawling a specific page. To do so, place the following code within the <HEAD></HEAD> tags of your html.
<meta name=”ROBOTS” content=”NOINDEX, NOFOLLOW”>
The NOINDEX keyword is telling the robots not to index the current page in their search results. The NOFOLLOW keyword is telling the robots not to follow any links on the current page.
How to get information about your php installation
When creating php programs, not only is it important to know which version of php is running on your server but also which modules are compiled with your php installation.
To check what modules are installed, simply type the following code in a php file and load the file in your browser.
phpinfo(8);
If you would like to just view the general php information such as the configuration, php.ini location, build date, and web server then you can use the following code.
phpinfo(1);
If you would like to view all of the information available about your php installation then just use the following code.
phpinfo();
This is a very quick and easy way to check and make sure that your php configuration is going to be compatible with the program you are planning to write.