PHP

Question 1

What does fmod() do?

Answer 1

Floating Modulus returns the modulus of a floating point number. number1 % number2.

Question 2

What is the syntax for floating point modulus?

Answer 2

fmod($x, $y)

- x will be divided by y

Question 3

What does XOR do?

Answer 3

Evaluates to true if one and only one condition is true.

Question 4

What is || and how else can it be written?

Answer 4

It checks if at least 1 condition is true and if so returns true it can also be written as OR

Question 5

What does && and how else can it be written?

Answer 5

Checks if both conditions are true and if so evaluates to true if one condition is false than then it evaluates to false. it can also be written as AND

Question 6

What is a ternary operator?

Answer 6

A short hand for writing if constructs.

Question 7

What is the syntax of a ternary operator?

Answer 7

$x = (CONDITION) ? TRUEBLOCK : FLASEBLOCK

Question 8

What is a constant?

Answer 8

Constants are basically variable that can’t be redefined.

Question 9

What is the syntax for creating a constant?

Answer 9

define(‘CONSTANT_NAME’, ‘CONSTANT_VALUE);

Question 10

What is the php syntax for an array?

Answer 10

$x = array(item1, item2, item3,);

Question 11

What is the shorthand syntax for an array and when can it be used?

Answer 11

$x = [item1, item2, item3,]; and it can be used as of php 5.4.

Question 12

What is a statement?

Answer 12

A statement is the the shortest piece of code that communicates a complete thought.

Question 13

When is the semicolon used?

Answer 13

At the end of a statement. It acts like a period.

Question 14

what does strlen( ) do?

Answer 14

It will give you the length of the string that is passed to the function.

Question 15

what does substr( ) do?

Answer 15

Selects a piece of a string. It is first passed a string, then a start point and the number of characters to return. i.e. substr(“Hello” 0, 3);
Would print “Hel”

Question 16

what does strtoupper( ) do?

Answer 16

Converts the string it is passed to upper case.

Question 17

What does strtolower( ) do?

Answer 17

Converts the string it is passed to lower case.

Question 18

What does strpos( ) do?

Answer 18

It checks if a substring is in a string and gives it’s index/position.

Question 19

What does round( ) do and what are it’s parameter.

Answer 19

round( ) is used to round a floating numer up or down.
It’s first parameter is the number or number stored in a variable that is to be rounded and the second is the decimal place of where to round to.

Question 20

What does ceil( ) do?

Answer 20

Forces a floating point number to round up.

Question 21

What does floor( ) do?

Answer 21

Forces a floating point number to round down.

Question 22

what does rand( ) do?

Answer 22

Produces a random number between the two parameters set. i.e. rand(1,5);
would return a random number between 1 and 5.

Question 23

what does array_push( ) do?

Answer 23

Adds an item to an array. The first parameter is the array to add to and the second is what to add.

Question 24

what does count( ) do?

Answer 24

Returns the number of items in an array.

Question 25

What does join( ) do?

Answer 25

It joins the items of an array together it has to parameter the “glue” and the “array”. The glue is what you want to have between the array elements and the array is the array you want to perform the function on.
i.e. join(“test “, $theArray);
would return all the elements in side the $theArray array and join them together with test (and then a space).

Question 26

what does sort( ) do?

Answer 26

It sorts the elements in an array from lowest to highest or A - Z.

Question 27

What does rsort( ) do?

Answer 27

It sorts the elements in an array from highest to lowest or from Z - A.