Server-side Web Development (I3302) 2017-2018 PHP Language Quiz

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Questions and Answers

In PHP, which function is used to display text?

display_text()

print_r()

printf()

echo() (correct)

What is the purpose of the 'date()' function in PHP?

To display the date of the last server restart

To retrieve the current server date

To format and display the current server date and time (correct)

To create a new date variable

Which method is used to pass variables in PHP through the URL?

PUT method

DATA method

GET method (correct)

POST method

What does the 'include' statement do in PHP?

It includes another PHP file in the current PHP script Signup and view all the answers

In PHP, what does the 'define()' function do?

It declares a constant Signup and view all the answers

Which type of array in PHP uses named keys that you assign to them?

Associative array Signup and view all the answers

What is the purpose of the 'exit()' function in PHP?

To terminate the script and return a value to the calling code Signup and view all the answers

How can environment variables be accessed in PHP?

$_SERVER['variable_name'] Signup and view all the answers

Which of these is used to stop the execution of a script in PHP?

'exit' Signup and view all the answers

What tags are used to display bold text in PHP?

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In PHP, how can you convert a variable into a primitive type by casting?

(int)$var Signup and view all the answers

Which function in PHP returns true if the variable is empty?

empty($var) Signup and view all the answers

What is the syntax for assigning a variable identifier the value of another variable in PHP?

${$var} = value; Signup and view all the answers

In PHP, what is the purpose of the isset($var) function?

Returns true if the variable exists Signup and view all the answers

What does the following syntax do in PHP: $name_variable = 3;

Assigns the value 3 to the variable $name_variable Signup and view all the answers

In PHP, what is the purpose of the unset($var) function?

Destroys a variable Signup and view all the answers

In PHP, what does $nbr = (int)$str; do?

$nbr equals to $str as an integer Signup and view all the answers

What are the three sorts of 'data' that can be stored in a variable in PHP?

text, numbers, or boolean Signup and view all the answers

$str = '12'; $nbr = (int)$str; // What does $nbr equal to after this in PHP?

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Study Notes

PHP Functions and Syntax

The echo function is used to display text in PHP.

Date and Time

The date() function returns the current date and time.

Passing Variables

Variables can be passed through the URL using the GET method.

Including Files

The include statement is used to insert the contents of one PHP file into another.

Defining Constants

The define() function is used to define a constant.

Array Types

An associative array is a type of array that uses named keys that are assigned to them.

Script Execution

The exit() function is used to stop the execution of a script.

Environment Variables

Environment variables can be accessed in PHP using the $_SERVER or $_ENV superglobals.

Stopping Script Execution

The die() or exit() function is used to stop the execution of a script.

Displaying Bold Text

The  tag is used to display bold text in PHP.

Casting Variables

A variable can be converted to a primitive type by casting using the (type) syntax.

Checking Variable Emptiness

The empty() function returns true if the variable is empty.

Variable Assignment

The syntax for assigning a variable identifier the value of another variable is $var2 = $var1.

Variable Existence

The isset() function checks if a variable is set and is not null.

Variable Unsetting

The unset() function is used to unset a variable.
The unset() function sets a variable to null.

Type Casting

$nbr = (int)$str; casts the string $str to an integer and assigns it to $nbr.

Data Types

Three types of data that can be stored in a variable in PHP are strings, integers, and floats.
After $str = '12'; $nbr = (int)$str;, $nbr equals 12.

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Description

Test your knowledge of PHP language and server-side web development concepts such as displaying text, using comments, functions like date(), passing variables with get and post, including external files, working with variables and constants, control instructions, dynamic functions, environment variables, arrays, and associative arrays.