Deck 6: Manipulating Arrays

Question 1

PHP creates indexed arrays by default with a starting element of 0.

Answer 1

False

Question 2

The internal array pointer is a way of keeping track of which element you are working with in an array.

Answer 2

True

Question 3

The array_name argument in the array_splice() function indicates the name of the array you want to eliminate.

Answer 3

False

Question 4

The in_array() function returns a Boolean value of TRUE if a value exists in an array.

Question 5

The array_unique() function removes elements that are unique to an array.

Question 6

If you use an iteration function to move the internal array pointer either before the first element or after the last element in an array, the only way to move the array pointer back to a valid element is to use the unset() function.

Question 7

The array_unique() function does not renumber the indexes after removing duplicate values in an array.

Question 8

You can use the unset() function to remove array elements and other variables.

Question 9

One problem with the unset() function is that is does not renumber the remaining elements in the array.

Question 10

The array_shift() function adds one or more elements to the beginning of an array.

Question 11

If you create an associative array and then add a new element without specifying a key, PHP will not assume that the array is indexed.

Question 12

To remove an indexed array's elements, you need to run the array_values() function.

Question 13

The array_values() function operates directly on an array.

Question 14

The array_splice() function adds or removes array elements located anywhere in an array.

Question 15

The array_push() function adds one or more elements to the end of an array.

Question 16

Aside from its main function, the array_splice() function also renumbers the indexes in the array.

Question 17

You use the array_unshift() function to remove the first element from the beginning of an array.

Question 18

The internal array pointer is a special type of variable that refers to the currently selected element in an array.

Question 19

The last element is removed from the end of an array using the array_pop() function.

Question 20

With associative arrays, you can use any alphanumeric keys that you want for the array elements.

Question 21

Use the array_slice() function to return or copy a portion of an array and assign it to another array.

Question 22

You refer to the values in a multidimensional indexed array by including two sets of brackets, one which refers to the row and one which refers to the column.

Question 23

The ____ function lets you add or remove elements anywhere else in the array.

A) array_add()
B) array_split()
C) array_splice()
D) array_values()

Question 24

The array_unshift() function adds ____ element(s) to the beginning of the array.

A) one or more
B) two or more
C) no new
D) only one

Question 25

The array_push() function ____ one or more elements to the end of the array.

A) adds
B) deletes
C) moves
D) pushes

Question 26

The most commonly used array sorting functions are sort() and rsort() for associative arrays.

Question 27

The array_search() function determines whether a given value exists in an array and returns the negative value of the first matching element is it exists or false if it does not exist.

Question 28

The ____ function removes duplicate elements from an array.

A) array_dup()
B) array_values()
C) array_unique()
D) array()

Question 29

To renumber an indexed array's elements, you need to run the ____ function.

A) unset()
B) array_values()
C) array()
D) array_num()

Question 30

The array_diff() function returns an array of elements that exist in one array but not in any other arrays to which it is compared.

Question 31

To have PHP store form data in an array, you modify the name attribute of the input element to use array notation.

Question 32

Instead of appending one array to another you can merge two or more arrays with the array_merge() function.

Question 33

To remove multiple elements using the unset() function, separate each ____ name with commas.

A) variable
B) array
C) element
D) argument

Question 34

PHP stores form data in an indexed array but cannot store form data in an associative array.

Question 35

The ____ argument of the array_splice() function indicates the name of the array you want to modify.

A) array_name
B) array_value
C) array_function
D) array_mod

Question 36

Use the array_keys() function to return an indexed array containing all the keys in an associative array.

Question 37

The array_key_exists() function determines whether a given index or key exists.

Question 38

The ____ is a special type of variable that refers to the currently selected element in an array.

A) external array pointer
B) external element pointer
C) internal array pointer
D) internal element pointer

Question 39

The array_shift() function removes the ____ element from the beginning of an array.

A) last
B) first
C) second
D) middle

Question 40

The array_pop() function ____ from the end of the array.

A) moves an element
B) copies the last element
C) deletes the first element
D) removes the last element

Question 41

The most common type of multidimensional array is a(n) ____ array.

A) multidimensional
B) two-dimensional
C) associative
D) indexed

Question 42

The array_pop() function removes the ____________________ elements from the end of the array.

Question 43

A multidimensional array in PHP is essentially ____.

A) a two-dimensional array
B) nonexistent
C) an array of arrays
D) an associative array

Question 44

The symbol ____ appends one array to another.

A) *
B) ==
C) +
D) &&

Question 45

You pass to the array_shift() function the name of the array whose first element you want to ____________________ .

Question 46

To sort an associative array by key, use the ____ function.

A) natsort()
B) ksort()
C) rsort()
D) asort()

Question 47

To perform a reverse sort on an associative array by key and maintain the existing keys, use the _____ function.

A) ksort()
B) krsort()
C) uk_sort()
D) sort()

Question 48

After adding or removing array elements, the ____________________ function also renumbers the indexes for an array.

Question 49

You can create ____ that consist of multiple indexes or keys.

A) indexed arrays
B) two-dimensional arrays
C) multidimensional arrays
D) key arrays

Question 50

If there are no indexes or keys entered in the value of the name attribute in a form, PHP assigns an index of ____ to the first element.

A) 0
B) 1
C) 2
D) PHP assigns no value

Question 51

____________________ function removes the first element from the beginning of an array.

Question 52

The ____ function returns a Boolean value of true if a given value exists in the array.

A) array_search()
B) array_boole()
C) array()
D) in_array()

Question 53

You use the ____ function to return a portion of an array and assign it to another array.

A) array_slice()
B) array_set()
C) array_assign()
D) array_key()

Question 54

The ____ function determines whether a given index or key exists.

A) array_values()
B) array_key_exists()
C) array_key()
D) array_set()

Question 55

The ____ function returns an array of elements that exist in one array but not in any other arrays to which it is compared.

A) array_compare()
B) array_diff()
C) array_search()
D) array_match()

Question 56

Merge two or more arrays with the ____ function.

A) array_merge()
B) array_plus()
C) array_paste()
D) array_values()

Question 57

The ____________________ function adds one or more elements to the end of an array.

Question 58

Multidimensional arrays are not limited to ____.

A) two dimensions
B) associative arrays
C) indexed elements
D) recursive arrays

Question 59

The data values for input elements that use array notation for the value of the name attribute are stored in a ____ array within the $_POST autoglobal array.

A) sub
B) nested
C) indexed
D) key

Question 60

The ____ function determines whether a given value exists in an array.

A) array_search()
B) in_array()
C) find_array()
D) array_values()

Question 61

To remove multiple elements using the unset() function, you must separate each element name with a ____________________ .

Question 62

You would use the ____________________ function t return an array of the elements that are common to all arrays that are compared.

Question 63

As with the array_values() function the ____________________ function does not operate directly on an array.

Question 64

The ____________________ function does not operate directly on an array; but, returns a new array with the renumbered indexes.

Question 65

The____________________ function returns a Boolean value of TRUE if a given value exists in an array.

Question 66

The ____________________ is a special type of variable that refers to the currently selected element in an array.

Question 67

You use the ____________________ function to create a new associative array that uses the values from one array as keys and the values from another array as element values.

Question 68

You pass the unset() function the array name and the ____________________ of the element you want to remove.

Question 69

The ____________________ function moves the internal array pointer to the last element in an array.

Question 70

Instead of appending one array to another, you can merge two or more arrays with the ____________________ function.

Question 71

The start_index argument of the array_slice() function indicates the ____________________ position within the array to begin extracting elements.

Question 72

The ____________________ function determines whether a given value exists in an array and returns the index or key of the first matching element if it exists or FALSE if it does not.

Question 73

Run the ____________________ function to renumber an indexed array's element.

Question 74

To assign the first element of an associative array with a number other than zero (0), use the array operator ____________________ .

Question 75

The array_unique() function removes ____________________ elements from an array.

Question 76

The array_key_exists() function determines whether a given____________________ or key exists.

Question 77

To refer to an element in an associative array, you place an element's ____________________ in single or double quotation marks inside the array brackets.

Question 78

The ____________________ function removes array elements and other variables.

Question 79

To randomize the order of array elements, you can use the ____________________ function.

Question 80

The most commonly used array sorting functions are ____________________ and rsort() for indexed arrays.