java - Captcha creation without a third party -

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newbie on here. i'm designing , coding few websites using adobe dreamweaver. i'm 3 months in web development @ current job @ point. haven't had formal training in web development, have eye design , attention detail.

however, more technical things difficult me i'm getting started. want create self contained captcha within 2 websites without using third party service or downloadable plugins. important, because creating website company work full time part of job description.

how go making simple contact form , captcha using php & java example? i'm familiar php , java.

if explain me in idiot-proof way i'd appreciate it. i've been browsing stack overflow, can't seem find specific , i'd prefer fresh answer.

thanks all. i'm not familiar of jargon yet, forgive me lack of knowledge presently.

if incredibly stupid question also, apologize - still need answer.

using php:
start session
create random string
store string session variable
create image display using php imagecreate
use imagettftext position characters 1 @ time @ random angle
verify user input against stored session variable


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