Part 2

Question 1

Function to get the type of a variable

Answer 1

gettype($var);

prints string, integer, etc

Question 2

Function to dump the variable

Answer 2

var_dump($var);
prints string(len) "whole string"
or int(928783)

Question 3

Function to reverse a string

Answer 3

strrev(“Hello, World!);

prints !dlroW ,olleH

Question 4

Function to make a string lowercase

Answer 4

strtolower(“HeLLO”);

prints hello

Question 5

Function to repeat

Answer 5

str_repeat(hi, 5);

prints hihihihihi

Question 6

Function to count number of times substring happens

Answer 6

substr_count($story, “like”);

prints amount of times like was in the story

Question 7

Function to create random number

Answer 7

rand();
getrandmax(); will give you the largest number that rand function can give you
rand(1,2); will return 1 or 2
rand(1,100); will return a number btwn 1 and 100 inclusive

Question 8

Pad a string to a certain length with another string

Answer 8

str_pad ( string $input , int $pad_length [, string $pad_string = “ “ [, int $pad_type = STR_PAD_RIGHT ]] ) : string
This function returns the input string padded on the left, the right, or both sides to the specified padding length. If the optional argument pad_string is not supplied, the input is padded with spaces, otherwise it is padded with characters from pad_string up to the limit.
$input = input string
$pad_length = length, if this is negative or the same amount as the string length, no padding will happen.
$pad_string = The pad_string may be truncated if the required number of padding characters can’t be evenly divided by the pad_string’s length.
$pad_type = Optional argument pad_type can be STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH. If pad_type is not specified it is assumed to be STR_PAD_RIGHT.

Question 9

function to turn string to uppercase

Answer 9

strtoupper();

Question 10

funcitons to round (and up and down)

Answer 10

round();
ceil(); //round up
floor(); //round down

Question 11

arrays reg and short syntax

Answer 11

$arr = array(1,2,3);
$arr = [1,2,3];

Question 12

print array

Answer 12

print_r($array);

doesn’t need echo!

Question 13

print array as a list of shit

Answer 13

implode($glue, $spices);
echo implode(", ", $num_arr);
prints 1, 2, 3

Question 14

Popping

Answer 14

array_pop();

takes array as argument. Removes the last element and returns it

Question 15

Pushing

Answer 15

array_push();
takes array as FIRST argument any argument added after will be added to the END array. returns the new number of the array

Question 16

Shifting

Answer 16

array_shift();

removes the first element in the array and returns that value. Rest of the elements will be shifted down.

Question 17

Unshifting

Answer 17

array_unshift();
takes array as first argument. arguments added after will be added to the BEGINNING of the array. it returns the new number of the array.

Question 18

Associative Array

Answer 18

$my_array = [“name” => “bob”, “age” => 34, “occupation” => “teacher”];

Question 19

Printing Associative Arrays

Answer 19

print_r($array);

Question 20

Removing element from associative arrays

Answer 20

unset($array[“key”]);

removes that key and pointed element