[PHP Tutorial] 21 Best CAPTCHAs: Bloggers Boon & Spammers Bane

From Good-Tutorials: PHP 21 Best CAPTCHAs: Bloggers Boon & Spammers Bane:

Do you know about Completely Automated Public Turing test to tell Computers and Humans Apart,? terminology? If you are a blogger then you must have used this in your various projects, while designing a contact form, login form or any other type of registration forms.

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