Question

1. Explain the purpose of the following PHP code

$subject_set = find_all_subjects();
$subject_count = mysqli_num_rows($subject_set);

8. List three scenarios where sessions are most useful in PHP

Answer 1

$subject_set = find_all_subjects();

Here, "find_all_subjects" returns the subject list which gets stored in "subject_set".

$subject_count = mysqli_num_rows($subject_set);

Further "mysqli_num_rows" returns the number of rows in the passed argument data set i.e. "subject_set" here, which gets stored in "subject_count"

Session can be used to:

- To store the website visit history of a particular user

- To store purchase cart items when shopping online

- To store the login password for a website, for a particular user login.