Count the occurance of each word in a text - PHP word count script

I need you to add a small PHP script to a very small existing website. The site is: [login to view URL] The existing site is in German but for the script it does not matter. The purpose of the site is to count the words in a text. Enter a text in the textbox and hit the big brown button "Text analysieren". It will show the total of words and letters in a text. What I need: Underneath the table where the total of letters is shown I want you to add a new table that does this for all the words in the text. Sort the table by how often the words occurs in the text and show the percentage of each word compared to the total of words in the text. For ex. the table would show this: "the" - 17 times - 7% "my" - 10 times - 4% "house" - 9 times 3% WORD 4 WORD 5 ...