Which one of the following function checks for the existence of DNS records?
In mail($param2, $param2, $param3, $param4), the $param2 contains:
Study following steps and determine the correct order
(1) Open a connection to MySql server
(2) Execute the SQL query
(3) Fetch the data from query
(4) Select database
(5) Close Connection
Which of the following is a PHP resource?
Which of the following are useful for method overloading?