Example
Introduction
When working with various libraries and their associated requirements, it is often necessary to know the version of current PHP parser or one of it's packages.
This function accepts a single optional parameter in the form of extension name: phpversion('extension'). If the extension in question is installed, the function will return a string containing version value. However, if the extension not installed FALSE will be returned. If the extension name is not provided, the function will return the version of PHP parser itself.
Example
print "Current PHP version: " . phpversion();
// Current PHP version: 7.0.8
print "Current cURL version: " . phpversion( 'curl' );
// Current cURL version: 7.0.8
// or
// false, no printed output if package is missing
