Mastering PHP Fundamentals

What is the correct way to start a PHP block?

• php<?

• >?php

• <?php

• <php>

Which of the following is a valid variable name in PHP?

• $1var

• $var1

• var-name

• var@123

How do you connect to a MySQL database using PHP?

• Connect using PDO with new PDO('mysql:host=host;dbname=database', 'username', 'password');

• Use pg_connect('host', 'username', 'password', 'database');

• Use mysqli_connect('host', 'username', 'password', 'database') or die('Connection failed: ' . mysqli_connect_error());

• Use mysql_connect('host', 'username', 'password');

What function is used to execute a SQL query in PHP?

• mysqli_query() or PDOStatement::execute()

• execute_query()

• db_query()

• run_sql()

How can you retrieve data from a form using the POST method in PHP?

• Use the $_POST superglobal array to access form data.

• Retrieve data using the $_REQUEST array only.

• Data cannot be retrieved from a form using the POST method.

• Use the $_GET superglobal array to access form data.

What is the purpose of PHP sessions?

• To enhance the speed of PHP execution.

• To execute PHP scripts on the server side.

• The purpose of PHP sessions is to maintain state and store user data across multiple pages.

• To store files on the server permanently.

How do you set a cookie in PHP?

• setcookie('name', 'value');

• setcookie('cookie_name', 'cookie_value', time() + 3600, '/');

• setcookie('name', 'value', time() - 3600, '/');

• setcookie('name', 'value', 0, '/');

What function is used to destroy a session in PHP?

• session_end()

• destroy_session()

• end_session()

• session_destroy()

How can you check if a cookie is set in PHP?

• Use $_COOKIE['cookie_name'] to check if a cookie is set.

• Use isset($_COOKIE['cookie_name']) to check if a cookie is set.

• Check if the cookie exists using cookie_exists('cookie_name').

• Use isset('cookie_name') to verify if a cookie is set.

What is the difference between include() and require() in PHP?

• require() can be used to include files conditionally.

• include() allows the script to continue on failure, while require() stops execution on failure.

• include() stops execution on failure, while require() allows it.

• include() and require() are identical in functionality.