I would like to know where you are coming up with this information.
From zend.com itself -
Zend’s founders are the designers of PHP 4 and the Zend Engine 1.0; on which all PHP sites and applications are run.
Zend didn't create php3, or anything like that. Zend was created by the people that developed PHP. Zend's major contribution is the Zend Engine.
They are currently the biggest company dedicated to PHP, but they certainly didn't create it, nor did they release any version of it.