Make Form and Simple Captcha Code in PHP

Now i want to share about how to make simple form and Captcha use PHP for your website but what for is Captcha actually ? wait a minute, i'm searching it....^_^
Captcha is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a person. hmm... i doubt about this, do you think animal or tree can make Facebook account ? hhahaha...
this is what i found in Wikipedia.

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