1. Log into your cpanel account.
2. In the "Software" section,. "MultiPHP Manager" Icon.
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3. Scroll down to the end of page, select your domain from the left side and you will see the option "PHP Version" with a drop-down list on the right side. Select the appropriate PHP version from the drop-down . and then click on Apply.
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. Now that you want to set PHP 5.6 on Example2, scroll down and select the example2 domain. Then set the PHP version to 5.6.
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Congratulations, both of your domains use different different PHP versions now.