Lesson 3

Question 1

is a program which processes the network requests of the users and serves them with files that create web pages. This exchange takes place using Hypertext Transfer Protocol (HTTP). Basically, web servers

Answer 1

Web Server

Question 2

are computers used to store HTTP files which makes a website and when a client requests a certain website, it delivers the requested website to the client.

Answer 2

Web Server

Question 3

There are many web servers available in the market both free and paid.

Answer 3

Web Server

Question 4

is a server that is managed from its own command line and is hosted on the user’s own personal computer.

Answer 4

Local Server

Question 5

are stored on a local network to the reference machine itself

Answer 5

Local Server

Question 6

on a local network to the reference machine itself. Examples of Local Web Server:

Answer 6

XAMPP (Cross Platform, Apache, MySQL, Perl, and PHP)
WAMP (Windows, Apache, MySQL, and PHP)
LAMP (Linux, Apache, MySQL, and PHP)
Laragon

Question 7

are hosted in spaces of a global network, managed by the hosting companies. It is an infrastructure that stores and processes information and applications belonging to a hosting company, with multiple servers and locations.

Answer 7

Cloud Server

Question 8

PHP is an acronym for “____________________”

Answer 8

PHP: Hypertext Preprocessor

Question 9

is a widely-used, open-source scripting language

Answer 9

PHP

Question 10

its scripts are executed on the server

Answer 10

PHP

Question 11

it is free to download and use

Answer 11

PHP

Question 12

is an amazing and popular language!

Answer 12

PHP

Question 13

It is powerful enough to be at the core of the biggest blogging system on the web (WordPress)!

Answer 13

PHP

Question 14

It is deep enough to run large social networks!

Answer 14

PHP

Question 15

It is also easy enough to be a beginner’s first server-side language!

Answer 15

PHP

Question 16

runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)

Answer 16

PHP

Question 17

is compatible with almost all servers used today (Apache, IIS, etc.)

Answer 17

PHP

Question 18

supports a wide range of databases

Answer 18

PHP

Question 19

is free. Download it from the official PHP resource: www.php.net

Answer 19

PHP

Question 20

is easy to learn and runs efficiently on the server side

Answer 20

PHP

Question 21

There have been multiple versions of PHP released since its inception.

Answer 21

PHP Versions

Question 22

There have been various major versions, including:

Answer 22

PHP 1.0
PHP 2.0
PHP 3.0
PHP 4.0
PHP 5.0
PHP 7.0
PHP 8.0 and so on.

Question 23

its files can contain text, HTML, CSS, JavaScript, and PHP code

Answer 23

PHP

Question 24

code is executed on the server, and the result is returned to the browser as plain HTML

Answer 24

PHP

Question 25

PHP files have extension "______”

Answer 25

.php

Question 26

can generate dynamic page content

Answer 26

PHP

Question 27

can create, open, read, write, delete, and close files on the server

Answer 27

PHP

Question 28

can collect form data

Answer 28

PHP

Question 29

can send and receive cookies

Answer 29

PHP

Question 30

can add, delete, modify data in your database

Answer 30

PHP

Question 31

can be used to control user-access

Answer 31

PHP

Question 32

can encrypt data

Answer 32

PHP

Question 33

With _____ you are not limited to output HTML. You can output images or PDF files. You can also output any text, such as XHTML and XML.

Answer 33

PHP

Question 34

Its script can be placed anywhere in the document.

Answer 34

PHP

Question 35

A PHP script starts with _______

Question 36

The default file extension for PHP files is "______".

Answer 36

.php

Question 37

normally contains HTML tags, and some PHP scripting code.

Answer 37

PHP file

Question 38

it uses a built in PHP function to output the text "Hello World!"

Answer 38

echo

Question 39

PHP keywords classes, functions, and user-defined are ______________

Answer 39

not case sensitive

Question 40

With PHP, there are two basic ways to get output:_____ and ____

Answer 40

echo and print

Question 41

_____ and ____ are more or less the same. They are both used to output data to the screen.

Answer 41

echo and print

Question 42

has no return value

Answer 42

echo

Question 43

has a return value of 1 so it can be used in expressions.

Answer 43

print

Question 44

can take multiple parameters (although such usage is rare)

Answer 44

echo

Question 45

can take one argument.

Answer 45

print

Question 46

is marginally faster than print.

Answer 46

echo

Question 47

can be used with or without parentheses

Answer 47

print

Question 48

is a line that is not executed as a part of the program. Its only purpose is to be read by someone who is looking at the code.

Answer 48

comment

Question 49

let others understand your code

Answer 49

comments

Question 50

remind yourself of what you did - Most programmers have experienced coming back to their own work a year or two later and having to re-figure out what they did.

Answer 50

comments

Question 51

can remind you of what you were thinking when you wrote the code

Answer 51

comments

Question 52

leave out some parts of your code

Answer 52

comments

Question 53

PHP supports several ways of commenting like:

Answer 53

// This is a single-line comment # This is also a single-line comment /* This is a multi-line comment */

Question 54

These are **"containers"** for storing information.

Answer 54

Variables

Question 55

can have a short name (like $x and $y) or a more descriptive name ($age, $carname, $total_volume).

Answer 55

Variable

Question 56

starts with the $ sign, followed by the name of the variable. Rules for PHP variables:

Answer 56

Variable

Question 57

can store data of different types, and different data types can do different things.

Answer 57

Variable

Question 58

What are the following data types that PHP supports?

Answer 58

String Integer Float (floating point numbers - also called double) Boolean Array Object NULL Resource

Question 59

are like variables, except that once they are defined they cannot be changed or undefined.

Answer 59

Constants

Question 60

is an identifier (name) for a simple value. The value cannot be changed during the script.

Answer 60

Constants

Question 61

A valid ______ name starts with a letter or underscore (no $ sign before the constant name).

Answer 61

Constant

Question 62

To create a constant, use the ______ function or use the const keyword.

Answer 62

define()

Question 63

is a sequence of characters, like "Hello world!".

Answer 63

string

Question 64

in PHP are surrounded by either double quotation marks, or single quotation marks.

Answer 64

string

Question 65

perform action on special characters.

Answer 65

Double Quoted String

Question 66

does not perform such actions, it returns the string like it was written, with the variable name.

Answer 66

Single Quoted String

Question 67

has a set of built-in functions that you can use to modify strings.

Answer 67

PHP

Question 68

returns the string in upper case.

Answer 68

strtoupper()

Question 69

returns the string in lower case.

Answer 69

strtolower()

Question 70

replaces some characters with some other characters in a string.

Answer 70

str_replace()

Question 71

To insert characters that are illegal in a string, use an_______

Answer 71

escape character.

Question 72

is a backslash \ followed by the character you want to insert.

Answer 72

escape character

Question 73

what are the escape characters used in PHP

Answer 73

\ ' \ " \ $ \n \r \t \f \ooo \xhh

Question 74

What is the escape character for single quote

Answer 74

\ '

Question 75

What is the escape character for double quote

Answer 75

\ "

Question 76

What is the escape character for PHP variable

Answer 76

\ $

Question 77

What is the escape character for new line

Answer 77

\n

Question 78

What is the escape character for Carriage Return

Answer 78

\r

Question 79

What is the escape character for Tab

Answer 79

\t

Question 80

What is the escape character for Form Feed

Answer 80

\f

Question 81

What is the escape character for octal value

Answer 81

\ooo

Question 82

What is the escape character for Hex Value

Answer 82

\xhh

Question 83

There are three main numeric types in PHP:

Answer 83

Integer Float Number Strings

Question 84

PHP has two more data types used for numbers:

Answer 84

Infinity NaN

Question 85

Variables of ________ are created when you assign a value to them.

Answer 85

numeric types

Question 86

Sometimes you need to change a variable from one data type into another, and sometimes you want a variable to have a specific data type.

Answer 86

Casting

Question 87

Casting in PHP is done with these statements:

Answer 87

(string) (int) (float) (bool) (array) (object) (unset)

Question 88

Converts to data type String

Answer 88

(string)

Question 89

Converts to data type Integer

Answer 89

(int)

Question 90

Converts to data type Float

Answer 90

(float)

Question 91

Converts to data type Boolean

Answer 91

(bool)

Question 92

Converts to data type Array

Answer 92

(array)

Question 93

Converts to data type Object

Answer 93

(object)

Question 94

Converts to data type NULL

Answer 94

(unset)