How to validate captcha within an online form

My job is to create a form for a competition and collect the data. This data will be collected by a company that we use to send e-mails (think Mail chimp). This company (email vision through their online software "campaign commander") has generated the form below. as you can see it does not validate captcha. What code do I need to make it validate captcha without leaving the form? The site was developed in PHP. Thank you for your help. and God bless us. Julian P. Webform
First name
Surname
Date of birth
Email
Mobile
Nearest shop
Opt in to marketing emails
CAPTCHA Image [ Different Image ]

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