Apart from the bare output of the script, you neither ask a question, nor do you write at least rudimentary information about what you have done so far and what kind of environment you work in (Server, PHP-Version, Browser)...
... I still try to give reasonably useful information:
Secure context: false
This shows, that you are not working in secure context!
-> the page MUST run in a https:// environment
This is a requirement that must be met in order to be able to use the API provided by the browser at all.
For more info see
w3.org/TR/push-api/
and
caniuse.com/#feat=push-api.
And just take a look at the featured blog post at
phpclasses.org/blog/package/11632/p
...
regards, Stefan