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Example code of pelock/yii2-anti-spam-form

Informations about the package yii2-anti-spam-form

Anti-Spam Form for Yii2 Framework

Anti-Spam Form is a form replacement component for the Yii2 Framework for creating anti-spam forms that are invisible in HTML code to spam bots & harvesting tools.

What's the idea behind anti-spam forms?

The concept is simple. Spam bots in most cases are simple tools. They will read your website, look for <form> HTML tags and artificially fill up the form fields and post it.

The usual spam bot is a web scraper written in Python retrieving raw HTML webpage content without evaluating JS code.

But one thing missed in anti-spam detection methods is that spam bots usually cannot process JavaScript code. For a good reason. It's time-consuming and requires JS interpreter to evaluate the JS code within the web page. And it's not that easy to incorporate JS evaluation without using complex & slower execution engines usually based on Chromium etc.

How to break spam bots?

Simple - put the HTML forms wrapped within JS code. Not the entire form, but the starting <form> tag with all its properties.

Suddenly the spam bots are unable to find it. Less spam without too much work.

How to install Anti-Spam Form component?

Install it first. Preferred way of WebApi interface installation is via composer.

Run:

Or add this entry:

directly to your composer.json in require section.

Installation package is available at https://packagist.org/packages/pelock/yii2-anti-spam-form

How to use Anti-Spam Form?

Replace your regular Yii2 ActiveForm component:

with AntiSpamForm:

That's all! The forms are going to work exactly the same, the only difference is the output HTML code.

Generated HTML code

What's the difference between the usual ActiveForm output HTML code and AntiSpamForm code?

Lets take a look. Before:

After:

The JavaScript code generates output <form> element with all of its properties. Simple & effective solution against spam bots and web scrapers, harvesters etc.

Should I remove CAPTCHA validations?

No. You should leave your CAPTCHA verifications in place, because some bots are able to run JS code, so the Anti-Spam Form will provide an additional layer of anti-spam protection.

Bugs, questions, feature requests

Hope you like it. For questions, bug & feature requests visit my site:

Bartosz Wójcik

All versions of yii2-anti-spam-form with dependencies

PHP Build Version
Package Version
Requires php Version >=5.4.0
yiisoft/yii2 Version >=2.0.4
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