Chapter 2

Question 1

What is wrong with the following example?

<title>Mixing HTML and PHP</title>

<?php </p>

print “

It’s such a perfect day!
“;

?>

Some paragraph text.

Answer 1

The

tag is within the PHP code. You want to try to keep your PHP and styles seprate.

Question 2

What does a single line of PHP commented code start with?

Answer 2

// This is a singe line of commented PHP code

Question 3

/ This is how you comment out a single line of PHP code.

True or False

Answer 3

False:

// This is how you comment out a single line of code

Question 4

How do you comment out several lines of PHP code at once?

Answer 4

/* This is how

you would

comment out

several lines

*/

Question 5

Is this a good example of commented code?

Yes or no and why?

/*

We are formating phone numbers by stripping all characters

then putting parens around the first 3 numbers adding a

space then grouping the next 3 numbers adding a dash

then the last 4 numbers

*/

Answer 5

No.

You want to be concise.

/*

The business has a requirement that all phone numbers be

formatted with the (123) 123-1234 format

*/

Question 6

What are the Basic DATA Types that PHP Supports?

Answer 6

• Integers
• Floats
• Strings
• Booleans

Question 7

What is an Integer?

Answer 7

• An integer is a basic data type php supports.
• Integer is a whole number

$a = 1234; // decimal number
$a = -123; // a negative number
$a = 0123; // octal number (equivalent to 83 decimal)
$a = 0x1A; // hexadecimal number (equivalent to 26 decimal)
$a = 0b11111111; // binary number (equivalent to 255 decimal)
?>

Question 8

What is are Floats?

Answer 8

• Floats are a basic data type PHP supports.
• Floats are fractions
• Floats are floating point numbers also known as:
  
  • floats
  • doubles
  • real numbers

$a = 1.234;
$b = 1.2e3;
$c = 7E-10;
?>

Question 9

What is the difference between Integers and floats?

Answer 9

Integers are whole numbers and floats are fractions

(i.e. 1, 2, 3 vs. 1.5, 2.3, 6.6)

Question 10

What is a String?

Answer 10

• A basic data type supported by PHP
• a group of characters encolsed in either single or doubl;e quotes.
• Quotes must match

“This is a string”

‘This is also a string’

“This is ‘actually’ a string”

‘This is another “example”’

Question 11

What does a document method of quoting strings look like?

Answer 11

print <<<eof>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus vulputate,</p>

<p>arcu a pellentesque viverra, elit metus pretium dui, nec congue ligula</p>

<p>velit vitae nunc. Aliquam est elit, faucibus vitae tincidunt sed, venenatis</p>

<p>vitae urna. Duis dignissim vel odio ac convallis. Suspendisse sodales viverra</p>

<p>ante, in consectetur nulla finibus a. Integer faucibus auctor ipsum, nec</p>

<p>tincidunt metus mattis id. Morbi non leo tristique, facilisis neque a,</p>

<p>volutpat purus. Class aptent taciti sociosqu ad litora torquent per</p>

<p>conubia nostra, per inceptos himenaeos.</p>

<p>EOF</p>

<p> </p>

</eof>

Question 12

What does a document metho of quoteing strings start with and end with?

Answer 12

print <<<eof>

<p>This is the string here.</p>

<p>This is the string here.</p>

<p>EOF</p>

<p> </p>

</eof>

Question 13

A boolean is a number.

True or False

Answer 13

False.

A boolean is a logical value of either true or false.

Question 14

What is a boolean?

Answer 14

• A basic data type supported by PHP
• a logical value that is either true or false.

Question 15

What are the Composite DATA Types supported by PHP?

Answer 15

• Arrays
• Objects
• NULL
• Resources

Question 16

What is an Array?

Answer 16

• A composite type supported by PHP
• An array is a collection of valuse.

Question 17

What is a NULL Data Type?

Answer 17

• A composite type supported by PHP
• NULL represents a variable with no data value.

Question 18

What is a respource data type?

Answer 18

• A composite type supported by PHP
• A reference to an external resource
• Used for working with files and databases

Question 19

What are objects?

Answer 19

• A composite type supported by PHP
• A way of representing every day data.

Question 20

What is gettype()?

Answer 20

gettype - gets the type of variable

<?php gettype($myVariable); ?>

Question 21

What kinds of variables does PHP support?

Answer 21

• Predefined
• User-Defined
• Form Variables related to names in an HTML form

Question 22

What are the valid variable names supposed to start with?

Answer 22

• All variables start with a $ followed by a letter or an _

$name1

$price_tag

$_abc

$Abc_22

$A23

Question 23

The following are all valid variable names.

True or False?

$10names

box.front

$name#last

A-23

$5

Answer 23

False.

All variables start with a $ followed by a letter or an _

Question 24

What is String Interpolation?

Answer 24

The process of evaluating a string literal containing one or more placeholders, yielding a result in which the placehoilders are replaced with their corresponding values.

Question 25

The following is NOT an example of String Interpolation.

True or False.

Answer 25

False.

String Interpolation is the process of evaluating a string literal containing one or more placeholders, yielding a result in which the placehoilders are replaced with their corresponding values.

Question 26

The following is an exaple of concatenation.

True or false?

<?php echo “Hello $name_variable” ?>

Answer 26

False. It is an example of String Interpolation.

String Interpolation is the process of evaluating a string literal containing one or more placeholders, yielding a result in which the placehoilders are replaced with their corresponding values.

Concatenation looks like this, using a . to concatenate.

<?php echo “Hello” . $name_variable ?>

Question 27

The following is an exaple of concatenation.

True or false?

<?php echo “Hello” . $name_variable ?</p>

Answer 27

True.

Question 28

What does Concatenation mean?

Answer 28

Concatenation is the action of linking things together.

In PHP you use the . to concatenate.

<?php echo “Hello” . $name_variable ?>

Question 29

What are scaler types?

Answer 29

• Boolean
• Integer
• Float (floating-point number aka double)
• String