What is BotDetect PHP CAPTCHA?
CAPTCHA is an acronym for Completely Automated Public Turing Test to Tell Computers and Humans Apart. As the name suggests, it's a kind of test that can reliably determine is the solver human, allowing webmasters to tell bots and humans apart.
Captcha software is a program automatically generating and grading Captcha tests that:
- Most people (i.e. real human users) can easily pass
- Current bots (i.e. various computer programs) can't pass
Bots are the Problem and CAPTCHA is the Solution
With the exponential growth of online services and businesses, website security has become a serious concern for webmasters and web application developers.
The Problem: Bots
Many software programs are written and used to impersonate human beings, mimic their surfing patterns, and imitate their online activities for various malicious purposes. These "pretending to be human" programs are referred to as bots (short for "robots"), spambots or spam bots (since they are most commonly used for spamming).
The Solution: CAPTCHA
BotDetect Captcha is an efficient out-of-the-box security solution designed to deal with this threat, available as a PHP Captcha Library for PHP forms.
Using Captcha images specifically designed to be out of the reach of currently available computer vision and OCR technologies, bots can be prevented from accessing protected website functionality.
While computer programs cannot read the textual code from the image, it is easy to read for most humans. So the answer to the webmaster's question "is the current client submitting this page a real person, and not a bot?" will be the same as the Captcha validation result.
To keep websites accessible to the blind and people with impaired vision – for whom reading the Captcha images could be a problem – BotDetect also provides a sound Captcha alternative, pronouncing the textual code to users who prefer to hear it.
More about PHP integration
The most of info you are going to need to integrate BotDetect with your PHP website you will find on the following links:
- BotDetect PHP CAPTCHA Crash Course
- Getting Started With BotDetect PHP CAPTCHA
BotDetect CAPTCHA PHP Integration Guides & Samples
- BotDetect PHP CAPTCHA Quickstart
- How To Add BotDetect CAPTCHA Protection to PHP Forms
- PHP Basic CAPTCHA Code Sample
- PHP Form CAPTCHA Code Sample
- PHP Login Form CAPTCHA Code Sample
- PHP jQuery Validation CAPTCHA Code Sample
- PHP jQuery AJAX Contact Form CAPTCHA Code Sample
- PHP Built-In Ajax CAPTCHA Validation Code Sample
- PHP Multiple CAPTCHAs Code Sample
- The BotDetect CAPTCHA Composer Package
- BotDetect CAPTCHA PHP Configuration Guides & Samples
- BotDetect CAPTCHA PHP Deployment Guides & Samples
- BotDetect CAPTCHA PHP Technical FAQ
- BotDetect PHP CAPTCHA API Reference
- BotDetect PHP CAPTCHA Release Notes
BotDetect PHP version framework integrations for CodeIgniter, CakePHP and Laravel frameworks are done already while Zend, Symphony, and Yii integrations are expected to follow soon.
BotDetect CAPTCHA Applications
- Prevent automated spam submission: BotDetect Captcha images ensure that an email, blog comment, forum post, guestbook entry or social networking message is sent by a human, not a bot.
- Prevent automated registrations: BotDetect Captcha images block bots that sign up for thousands of email, forum or social networking accounts every minute.
- Prevent automated friend requests: BotDetect Captcha images block bots that send thousands of fake friend requests on social networking and instant messaging sites every minute.
- Secure login pages: BotDetect Captcha images prevent dictionary attacks and brute force attacks trying to guess login information
- Block malicious crawlers: BotDetect Captcha images guarantee that bots trying to leech content or find vulnerabilities to exploit won't access protected website sections.
- Prevent poll manipulation: BotDetect Captcha images protect online polls by ensuring only humans can vote and automated voting scripts can't manipulate the results.
- Prevent resource harvesting: BotDetect Captcha images protect online games and virtual worlds with economic systems from automated virtual resource ("gold") harvesting.
- Prevent cheating in contests: BotDetect Captcha images protect skill-based online games from fraudulent users who employ bots to achieve unfair advantage over other players.
BotDetect, and other Captchas Accessibility Guidelines
- The Accessibility Demand for Audio CAPTCHA
- Section 508 CAPTCHA: How to Make CAPTCHA Comply with Access Board Section 508 Standards
- WCAG CAPTCHA: How to Make CAPTCHA Conform to W3C WCAG 2.0 Standards
PHP: Hypertext Preprocessor
PHP is a server-side scripting language designed for web development but also used as a general-purpose programming language. As of January 2013, PHP was installed on more than 240 million websites (39% of those sampled) and 2.1 million web servers. Originally created by Rasmus Lerdorf in 1994, the reference implementation of PHP (powered by the Zend Engine) is now produced by The PHP Group. While PHP originally stood for Personal Home Page, it now stands for PHP: Hypertext Preprocessor, which is a recursive backronym.
PHP code can be simply mixed with HTML code, or it can be used in combination with various templating engines and web frameworks. PHP code is usually processed by a PHP interpreter, which is usually implemented as a web server's native module or a Common Gateway Interface (CGI) executable. After the PHP code is interpreted and executed, the web server sends the resulting output to its client, usually in the form of a part of the generated web page; for example, PHP code can generate a web page's HTML code, an image, or some other data. PHP has also evolved to include a command-line interface (CLI) capability and can be used in standalone graphical applications.