is_null

<?php         $testVersion = $this->getTestVersion();

        $testVersion = $testVersion[1];



        if (\is_null($testVersion) === true

            || \version_compare($testVersion, $phpVersion) >= 0

        ) {

            return true;

<?php         $testVersion = $this->getTestVersion();

        $testVersion = $testVersion[0];



        if (\is_null($testVersion) === false

            && \version_compare($testVersion, $phpVersion) <= 0

        ) {

            return true;