It all depends on why you want to be certified. If you want to learn only about new features, you should wait for PHP7 certification. But if you need to find a job or convince your boss that you understand PHP, you can now get a PHP5 certificate.
I think it will take several years for clients to use PHP7, and we will see some years when 5 and 7 will be supported next to each other. A lot of outdated code will break due to the refusal to support some modules. For example, the mysql module is still in use.
l.renkema
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