PHP 5 was released in July 2004 after long development and several pre-releases. It is mainly driven by its core, the Zend Engine 2.0 with a new object model and dozens of other new features.
PHP’s development team includes dozens of developers, as well as dozens others working on PHP-related and supporting projects, such as PEAR, PECL, and documentation, and an underlying network infrastructure of well over one-hundred individual web servers on six of the seven continents of the world. Though only an estimate based upon statistics from previous years, it is safe to presume PHP is now installed on tens or even perhaps hundreds of millions of domains around the world.
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