PHP Functions Quiz

What keyword is used to define a user-defined function in PHP?

• def

• function

• define

• func

Which of the following is a valid reason to use functions in PHP?

• To increase the number of lines of code

• To minimize the number of source-code

• To make the code more difficult to read

• To prevent the use of variables

What is the main purpose of the return statement in a function?

• To stop the PHP script entirely

• To output a value directly to the browser

• To send a value back to the calling code

• To declare a new variable

Which pre-defined function is used to include a file and produce a fatal error if the file is not found?

• include()

• insert()

• require()

• attach()

The date() function is used to:

• Calculate the difference between two dates

• Create and format a date and/or time

• Convert a date into a timestamp only

• Set the server's default timezone

Which function is used to start a PHP session?

• session_begin()

• start_session()

• session_start()

• $_SESSION()

Which function is used to calculate the square root of a number?

• pow()

• sqrt()

• exp()

• hypot()

What is the purpose of the strtoupper() function?

• Converts a string to lowercase letters

• Converts the first character of a string to uppercase

• Converts a string to uppercase letters

• Converts the first character of each word to uppercase

Which function returns the absolute (positive) value of a number?

• ceil()

• floor()

• round()

• abs()

The explode() function is used to:

• Combine strings with a delimiter

• Break a string into an array

• Calculate the exponent of e

• Find the position of a character in a string