Arrays

Question 1

How do you map over an array?

Answer 1

array_map(‘numMultiplier’, $arr);

Question 2

How do you get the sum of an array and how do you get the product?

Answer 2

array_sum($arr);

array_product($arr);

Question 3

How do you filter over an array?

Answer 3

array_filter($arr, ‘bigNums’);

Question 4

How do you check whether a value is in an array?

Answer 4

in_array(2, $arr);

Question 5

How do you see all the different values between two arrays?

Answer 5

array_diff($arr, $arr2);

Question 6

How do you replace certain values from one array with specified values from another array?

Answer 6

array_replace($arr, array(2 => ‘Seb’));

Question 7

How can you remove all duplicate values from an array?

Answer 7

array_unique($arr);

Question 8

How can you easily get the last item from an array?

Answer 8

end($arr);

Question 9

How can iterate through every item in an array?

Answer 9

foreach($arr as $name) {

}