generar json en php

<?php

$student = array("id"=>101,
"name"=>"John Doe",
"isStudent"=>true,
"scores"=>array(10, 20, 30, 40),
"courses" => array(
"major"=>"Finance",
"minor"=>"Marketing"
)
);

echo json_encode($student); //encoding the array into a JSON string
//and using echo to  print the output

?>