Language features

Question 1

echo

Answer 1

outputs strings

Question 2

.

Answer 2

concatenation

Question 3

$var

Answer 3

php variable declaration requires $ at the front

Question 4

$array

Answer 4

arrays are declared by creating a variable, newing up an array, and passing args.

$array = array(“Egg”, “Tomato”, “Bacon”);

Question 5

array_push

Answer 5

adds to array

Question 6

unset()

Answer 6

removes an item from array

Question 7

strlen()

Answer 7

length of a string

Question 8

substr()

Answer 8

part of a string

Question 9

strtoupper()

Answer 9

uppercase a string

Question 10

strtolower()

Answer 10

lowercase a string

Question 11

strpos()

Answer 11

gives the first occurence of a character in a string

Question 12

round()

Answer 12

rounds to nearest whole number

OPTIONAL: pass number of places to round to

Question 13

join(glue, array)

Answer 13

joins an array into a string, with “glue” chars

Question 14

sort()

Answer 14

sorts an array

Question 15

rsort()

Answer 15

reverse sorts an array

Question 16

public function __construct()

Answer 16

php class constructor function

Question 17

is_a()

Answer 17

object method to test if an object is an instance of a class
(first arg is obj we’re checking, second is class)

Question 18

property_exists()

Answer 18

check if an object has a given property (first arg is obj we’re checking, second is prop)

Question 19

method_exists()

Answer 19

see if an object has a given method (first arg is obj we’re checking, second is method)

Question 20

extends

Answer 20

keyword for inheritance
i.e. class Square extends Shape {}

Question 21

final

Answer 21

keyword to prevent parent class methods from being overridden by its children

Question 22

const

Answer 22

constant variables
does not start with $
accessed via scope resolution operator
i.e. echo Ninja::stealth;

Question 23

static

Answer 23

lets you use a class property or method without having to create an instance of that class.
i.e.	King::proclaim();

Question 24

associative array

Answer 24

‘key’ => ‘value’ pair

aka a dictionary

Question 25

multidimensional array

Answer 25

array of arrays

Question 26

::

Answer 26

scope resolution operator

allows access to static, constant, and overridden props or methods of a class

Question 27

->

Answer 27

access object member (props or methods)

equivalent to “.” in C# or JS