PHP Array and String MCQs

Which function is used to count the number of elements in an array?

• count()

• sizeof()

• length()

• Both A and B

What will be the output of the following code? $arr = array("Apple", "Banana", "Mango"); echo $arr[1];

• Apple

• Banana

• Mango

• Error

Which function is used to merge two or more arrays in PHP?

• array_combine()

• array_merge()

• array_union()

• array_connect()

What does the array_keys() function return?

• Only numeric keys

• Only string keys

• An array of all keys from an array

• A string of all keys

Which function removes the last element from an array?

• array_shift()

• array_pop()

• array_unset()

• array_remove()

What will be the output of the following code? $arr = array(1 => "One", 2 => "Two", 3 => "Three"); print_r(array_values($arr));

• Array ( [0] => One [1] => Two [2] => Three )

• Array ( [1] => One [2] => Two [3] => Three )

• Array ( [0] => Two [1] => Three [2] => One )

• Error

How do you check if a key exists in an associative array?

• isset()

• array_key_exists()

• in_array()

• key_exists()

Which function sorts an array in ascending order while maintaining index association?

• sort()

• asort()

• ksort()

• rsort()

What is the function used to shuffle the elements of an array?

• array_random()

• array_shuffle()

• shuffle()

• random_array()

What will array_reverse() do in PHP?

• Sort the array in descending order

• Remove duplicate values from the array

• Reverse the order of array elements

• Remove the last element of the array