Below is the code that can be used to remove non ascii character from a string.

$cleanString = preg_replace(‘/[^(\x20-\x7F)]*/’,”, $dirtyString);

But what the hell that code means!

Well, that code uses regular expression to replace every single character that is not in the range of x20 – x7F in ASCII code with an empty character. In other words, it will delete character that is not in the ascii range x20 – x7F (Hexadecimal).

For more information about ASCII character code see the ASCII table or here. From the ASCII table you may see that x20 represents ‘Space’ and x7F represents ‘DEL’.

If you want to learn more  about regular expression here is the link: http://www.regular-expressions.info

Cause we are using regular expression, the  code above can also be applied to any other platform (not only PHP) that supports regular expression.

MAC (Media Access Control) address is a unique identifier assigned to network interfaces for communications on the physical network segment? (wikipedia). It is stored in the network interface card by the manufacturer.

The MAC address consists of a series of six pairs of numbers and letters separated by dashes. It’s a base-16 value (also called hexadecimal) looks like this 00-19-D2-C5-40-78. …click here to read more

Standard mozilla firefox browser does not have google pagerank toolbar. This toolbar shows you the google pagerank of the current url. If you need this tool you should install it by yourself. The tool comes as add-ons to mozilla firefox browser.

You can install the google pagerank tool from here.

If you have successfully installed google pagerank add-ons, the page rank status will appear on the bottom right corner of your browser.