📝 PHP Arrays – MCQ Test

✅ Section A: Basic (Indexed Arrays)

🔹 Q1

Which function is used to count elements in an array?
A) size()
B) count()
C) length()
D) total()

👉 Answer: B

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🔹 Q2

What is the index of the first element in PHP array?
A) 1
B) 0
C) -1
D) None

👉 Answer: B

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🔹 Q3

What will this output?

$colors = ["Red", "Green", "Blue"];
echo $colors[1];

A) Red
B) Green
C) Blue
D) Error

👉 Answer: B

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🔹 Q4

Which loop is commonly used for indexed arrays?
A) while
B) do-while
C) for
D) switch

👉 Answer: C

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🔹 Q5

Which of the following creates an array?
A) $arr = ();
B) $arr = [];
C) $arr = {};
D) $arr = <>;

👉 Answer: B

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✅ Section B: Associative Arrays

🔹 Q6

Associative arrays use:
A) Numbers as keys
B) Strings as keys
C) Both
D) None

👉 Answer: C

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🔹 Q7

What will this output?

$student = ["name" => "Aditya", "age" => 22];
echo $student["name"];

A) 22
B) name
C) Aditya
D) Error

👉 Answer: C

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🔹 Q8

Which loop is best for associative arrays?
A) for
B) foreach
C) while
D) switch

👉 Answer: B

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🔹 Q9

Function to check if key exists in array:
A) isset()
B) array_key_exists()
C) key_exists()
D) Both B and C

👉 Answer: D

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🔹 Q10

Which function sorts associative array by value?
A) sort()
B) ksort()
C) asort()
D) rsort()

👉 Answer: C

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✅ Section C: Multidimensional Arrays

🔹 Q11

Multidimensional array means:
A) One value
B) Array inside array
C) Only numbers
D) Only strings

👉 Answer: B

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🔹 Q12

Output of:

$data = [["A", "B"], ["C", "D"]];
echo $data[1][0];

A) A
B) B
C) C
D) D

👉 Answer: C

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🔹 Q13

Which loop is best for multidimensional arrays?
A) Nested loop
B) Single loop
C) switch
D) goto

👉 Answer: A

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✅ Section D: Array Functions

🔹 Q14

Which function sorts array in ascending order?
A) rsort()
B) sort()
C) asort()
D) ksort()

👉 Answer: B

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🔹 Q15

Which function merges arrays?
A) combine()
B) array_merge()
C) join()
D) concat()

👉 Answer: B

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🔹 Q16

Which function removes duplicates?
A) array_unique()
B) unique()
C) remove_dup()
D) array_clean()

👉 Answer: A

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🔹 Q17

Which function filters array values?
A) array_map()
B) array_filter()
C) filter_array()
D) array_reduce()

👉 Answer: B

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🔹 Q18

Which function modifies each element?
A) array_filter()
B) array_map()
C) array_sort()
D) array_merge()

👉 Answer: B

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✅ Section E: Advanced

🔹 Q19

What will array_map() return?
A) Boolean
B) New array
C) Integer
D) String

👉 Answer: B

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🔹 Q20

Which function sorts array by key?
A) sort()
B) asort()
C) ksort()
D) rsort()

👉 Answer: C

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