Getting json data from php use js to read and display to webpage NOTE _ PHP Tutorial

Obtain json data from php and use js to read the notes displayed on the webpage. How can I get json data from php and use js to read the php code displayed to the webpage notes? Convert phpjson to array $ arrayarray (usernamehellojson, age23, sexM); define php array $ resjson_encode (get json data from php and use js to read the display to webpage notes
Php code

 "Hellojson", "age" => 23, "sex" => "M"); // defines the php array $ res = json_encode ($ array ); // var_dump ($ res); echo $ res; // output the result to the page?> HTML code