TYPO3 Version Check for extensions

tx_versionCheck.php

$version = class_exists('t3lib_utility_VersionNumber')
	? t3lib_utility_VersionNumber::convertVersionNumberToInteger(TYPO3_version)
	: t3lib_div::int_from_ver(TYPO3_version);
if ($version < 4006000) {
	// do stuff for TYPO3 < 4.6
}

// Version Integer = [Major version XX][Minor version XX][Patch versions XXX] - e.g. »4.7.12« = »4007012«

// Read some discussions about the version check in the mailing list: http://typo3.3.n7.nabble.com/Second-Meeting-for-TYPO3-6-2-LTS-Release-td243944.html