You will write a PHP program with a large text area and a "go" button.. 
When the user clicks the go button, you will search the text area.  If you 
find any mis-spelled words in the text area, print them.

A word is spelled correctly if it can be found in /usr/share/dict/words.

You are forbidden from reading the dictionary more than once.
Your program must run faster than O(number_of_text_area * number_in_dict).

+1 works on one word
+1 works on a bunch of words
+1 reads the dict
+2 Uses and algorthm faster than the limit above.