Web Programming - Week 5

Question 1

What are dynamic web pages

Answer 1

Web pages that are not prebuilt

Question 2

Advantages and Disadvantages of dynamic web pages

Answer 2

Advantages: Dynamic and Interactive
Disadvantages: Slower than Static web pages

Question 3

Dynamic web page languages

Answer 3

PHP, Python, ASP

Question 4

PHP Basics

Answer 4

PHP Files have extension .php
A PHP script starts with < ?php ends with ? >
PHP can be embedded in HTML
PHP statements are terminated by a semicolon

Question 5

Comments in PHP

Answer 5

# or // - Single line
/* */ - Multi line

Question 6

PHP Variable Syntax

Answer 6

$variable_name = value

Question 7

PHP Strings

Answer 7

Enclosed in single or double quotes

Concatenated with .

Question 8

Interpolated variables

Answer 8

Double quotes interpolates variables in a string, single quotes do not

Question 9

Output in PHP

Answer 9

Browser only shows front end, PHP script is replaced by its output in HTML

Question 10

Print in PHP

Answer 10

print() - prints 1 value

print_r() - prints structured values

Question 11

Echo in PHP

Answer 11

Not a function so no brackets needed

Like print function

Question 12

foreach syntax

Answer 12

foreach ($myArray as $value){
 //statements ;
}

Question 13

DataType check function

Answer 13

is_datatype($v)

Question 14

Number Array Syntax

Answer 14

$array_name = array(“Value1”, “Value2”, etc…) ;

OR 0 => “Value1” etc…

Question 15

Associative Array Syntax

Answer 15

$array_name = array(“Name1”=Value1, “Name2”=Value2, etc…) ;

Question 16

Associative Array foreach

Answer 16

foreach ($myArray as $name=>$val){
 //statements ;
}

Question 17

Array functions

Answer 17

sizeof()
count()
sort()
array_merge()

array_push() - Inserts one or more elements to the end of an array

Question 18

Encode array to JSON format function

Answer 18

json_encode()

Question 19

Function Syntax

Answer 19

function functionName ($arg1, $arg2,...){
 //statements ;
}

Question 20

Calling a function

Answer 20

$returnVal = functionName($arg1, $arg2,…)

Question 21

Modify variable outside function

Answer 21

Requires & operator