This is an easy to integrate shoutbox that you can use also as chat.
The installation is really easily: You have just to upload one file, follow the introductions and that’s it!
With just 47KB, PHP7 OOP and jQuery powered it also very fast and looks also good.

Features:

• Ajax powered (no page reloads needed!)
• You have to upload just ONE file to get the shoutbox running/install it.
• Over 30 smilies included
• Very easy to integrate into any existing (X)HTML or PHP page on your site
• Cross browser support (IE9+, Firefox, Safari, Chrome, Opera, Android/iOS browser and more)
• Very small: About 47KB (including jQuery, JavaScripts, images and all the rest)
• PHP5 and PHP7 compatible
• XSS secure
• SQL-Injection protected
• UTF-8 support
• Shoutbox uses just 1 CSS file (+1 for mobile)
• Clean PHP5 OOP code (very well commented!)
• Valid HTML5
• Mobile support
• HTTPS support
• Simple and elegant user interface
• Smooth transitions
• SPAM protection
• Smilie support
• Really simple installation
• Uses standard PHP server features for extensive compatibility

Server requirements:

• PHP 5.4
• MySQL database
• A web server (preferably Linux Apache)

Update v1.5 (08 July, 2017)

• Added: PHP7 support
• Updated: Improved Mobile CSS
• Updated: Switched from MyISAM to InnoDB (increased performance)
• Updated: Moved configuration into own file for easier changes
• Updated: Optimization and reduction of CSS/JS
• Updated: Latest jQuery version
• Updated: Improved lossy compression of images (additional performance improvement)
• Updated: Smaller cleanups of HTML
• Removed: IE7, IE8 support

Update v1.4 (22 October, 2014)

• Added: Mobile support
• Added: Retina support
• Added: HTTPS support
• Added: IPv6 support
• Added: Prepopulate username field over parameter (optional)
• Updated: Updated code to be compatible with PHP 5.6
• Updated: Switched to HTML5 (Shoutbox, Documentation, Installer)
• Updated: Improved overall performance and code refactoring
• Updated: Lossy compression of images (additional performance improvement)
• Updated: Updated to current jQuery version (additional performance improvement)
• Updated: Documentation and Installer update
• Bugfix: Fixed deprecated mysql_* code
• Bugfix: Reduced error possibility during SQL import
• Bugfix: Expanded length of IP database field for IPv6
• Removed: IE6 support

Update v1.3 (08 July, 2013)

• Feature/Bugfix: Added the Shoutbox without the installer
• Bugfix: Updated some CSS for latest browser support

Update v1.2 (18 December, 2011)

• Added: Support for mobile devices (e.g. iPhone, Android etc.)
• Bugfix: 500 server error fixed

Update v1.1 (05 November, 2009)

• Several bug fixes
• Added: Too long words/lines are separate in several lines
• Added: Possibility to disable smilies
• Added: Login-Button added
• Feature: BBCode: [b][/b] (bold) added
• Feature: BBCode: [i][/i] (italic) added
• Feature: BBCode: [url][/url] (link) added
• Feature: BBCode: [url=][/url] (link) added

Tags:
Shoutbox, Chat, Ajax, PHP, jQuery, UTF-8, Mobile

If you have questions, feel free to comment or send me a mail.