Find/count different word in a text

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Hello again.
I am looking for a way to find and count different word in a text..
I am thinking on save the text as array and iterate through the array.
Then I like to register all different words in the text.
For example. If bread is used more than one time, I will not count it.
After the check were I have found single (one) word of every words, I
count it and tell how many different word that is in the text.

Is this difficult to do? Can you give me a hint for were I shall look
on www.php.net for a solution to fix this problem? What function am I
in need of?

Thank you very much.
Kind Regards, Karl

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