Zend_Version provides a class constant
Zend_Version::VERSION that contains a string
identifying the version number of your Zend Framework installation.
Zend_Version::VERSION might contain "1.7.4", for example.
The static method Zend_Version::compareVersion($version) is based on the PHP function » version_compare(). This method returns -1 if the specified version is older than the installed Zend Framework version, 0 if they are the same and +1 if the specified version is newer than the version of the Zend Framework installation.
Example #1 Example of the compareVersion() Method
// returns -1, 0 or 1 $cmp = Zend_Version::compareVersion('2.0.0');