What are the operational outputs

Question

<?Php
define("COMMERCE","商务活动");
echo COMMERCE;
echo commerce;
define("STUDENT","学生信息",true);
echo"<br>";
echo STUDENT;
echo"<br>";
echo student;
echo"<br>";
echo(define("STUDENT"));
echo"<br>";
echo constant("STUDENT");
?>

Answer 1

Just write code in Sololearn Playground and check what results are coming.