Neos.ContentRepository/Classes/Migration/Configuration/Configuration.php
public function isVersionAvailable($version)
    {
        if ($this->availableVersions === null) {
            $this->registerAvailableVersions();
        }
        return isset($this->availableVersions[$version]);
    }
public function isVersionAvailable($version)
    {
        if ($this->availableVersions === null) {
            $this->registerAvailableVersions();
        }
        return isset($this->availableVersions[$version]);
    }
public function isVersionAvailable ( $ version ) { if ( $ this -> availableVersions === null ) { $ this -> registerAvailableVersions ( ) ; } return isset ( $ this -> availableVersions [ $ version ] ) ; }
If the given version is available, true is returned.

@param string $version
@return boolean
If the given version is available true is returned .