Protecting web forms from spam bots using PHP
Spam bot is a program that submits the data to server by guessing form fields with html code.
For detailed article please refer my previous post.

Here some methods of preventing Spam bots that automatically submits.

Using captcha
Using random hidden field
Using hidden input text box.
Email header injecting.
Checking referrer [...]

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protecting E-mail Address on web pages with php, javascript from E-mail spammers
E-mail Spam is flooding the Internet with many copies of the same message, in an attempt to force the message on people who would not otherwise choose to receive it.Most spam is Commercial advertising, often for dubious products, get-rich-quick schemes, or quasi-legal services. Spam [...]

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