public function getExitCodeText()
    {
        if (null === $exitcode = $this->getExitCode()) {
            return;
        }

        return isset(self::$exitCodes[$exitcode]) ? self::$exitCodes[$exitcode] : 'Unknown error';
    }
public function getExitCodeText()
    {
        if (null === $exitcode = $this->getExitCode()) {
            return;
        }

        return isset(self::$exitCodes[$exitcode]) ? self::$exitCodes[$exitcode] : 'Unknown error';
    }
public function getExitCodeText ( ) { if ( null === $ exitcode = $ this -> getExitCode ( ) ) { return ; } return isset ( self :: $ exitCodes [ $ exitcode ] ) ? self :: $ exitCodes [ $ exitcode ] : 'Unknown error' ; }
Returns a string representation for the exit code returned by the process.

This method relies on the Unix exit code status standardization
and might not be relevant for other operating systems.

@return string|null A string representation for the exit status code, null if the Process is not terminated

@see http://tldp.org/LDP/abs/html/exitcodes.html
@see http://en.wikipedia.org/wiki/Unix_signal
Returns a string representation for the exit code returned by the process .