20+ PHP Data Types MCQs with Answers

Best 20+ multiple-choice questions (MCQs) on PHP Data Types and related topics. The questions are designed to test your knowledge and understanding of PHP data types, operators, and their behaviors. Each question is followed by four options and the correct answer is highlighted for each question. This content is useful for anyone who wants to test their knowledge of PHP data types or prepare for PHP certification exams.

Question 1: What is the output of the following PHP code snippet?

$var1 = "hello";
$var2 = 5;
echo gettype($var1) . " " . gettype($var2);

• string integer
• integer string
• string string
• integer integer

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Answer: c) string string

Question 2: What is the data type of the value returned by the PHP function strpos()?

• integer
• string
• array
• boolean

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Question 3: What is the output of the following PHP code snippet?

$var1 = 2;
$var2 = "2";
echo $var1 + $var2;

• 22
• 4
• 0
• 2

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Question 4: Which of the following is not a PHP data type?

• boolean
• integer
• float
• character

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Question 5: What is the output of the following PHP code snippet?

$var1 = true;
$var2 = false;
echo gettype($var1) . " " . gettype($var2);

• boolean boolean
• integer integer
• string string
• boolean integer

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Question 6: Which of the following is not a PHP scalar data type?

• boolean
• float
• array
• string

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Question 7: What is the output of the following PHP code snippet?

$var1 = 10;
$var2 = "10";
if ($var1 === $var2) {
  echo "Equal";
} else {
  echo "Not Equal";
}

• Equal
• Not Equal
• 10
• Error

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Question 8: Which of the following data types is used to store a collection of key-value pairs in PHP?

• integer
• float
• boolean
• array

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Question 9: What is the output of the following PHP code snippet?

$str = "123abc";
$num = (int) $str;
echo gettype($num) . " " . $num;

• string 123abc
• integer 123
• string 123
• integer 123abc

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Question 10: Which of the following data types is used to represent a null value in PHP?

• boolean
• integer
• null
• string

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Question 11: What is the output of the following PHP code snippet?

$str1 = "hello";
$str2 = "world";
echo $str1 . " " . $str2;

• hello world
• helloworld
• "hello" "world"
• "helloworld"

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Question 12: Which of the following data types is used to store a sequence of characters in PHP?

• integer
• boolean
• string
• array

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Question 13: What is the output of the following PHP code snippet?

$var1 = "10";
$var2 = "20";
echo $var1 + $var2;

• 30
• 1020
• 0
• NaN

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Question 14: Which of the following data types is used to represent a list of ordered items in PHP?

• string
• integer
• array
• null

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Question 15: What is the output of the following PHP code snippet?

$var1 = true;
$var2 = "false";
if ($var1 && !$var2) {
  echo "True";
} else {
  echo "False";
}

• True
• False
• Nothing is outputted
• Error

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Question 16: Which of the following is a PHP non-scalar data type?

• string
• float
• boolean
• object

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Question 17: What is the output of the following PHP code snippet?

$arr = array("apple", "banana", "cherry");
echo count($arr);

• apple, banana, cherry
• 3
• 6
• Error

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Question 18: Which of the following data types is used to store a boolean value in PHP?

• integer
• float
• boolean
• string

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Question 19: What is the output of the following PHP code snippet?

$x = 5;
echo ++$x;

• 6
• 5
• 11
• Error

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Question 20: Which of the following data types is used to store large numbers with decimals in PHP?

• boolean
• integer
• string
• float

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Question 21: Which of the following operators is used for concatenating two strings in PHP?

• *
• /
• –
• .

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Question 22: What is the output of the following PHP code snippet?

$x = 10;
echo ++$x + $x++;

• 20
• 21
• 22
• 11

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Question 23: Which of the following data types is used to represent nothing in PHP?

• boolean
• string
• integer
• null

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Question 24: What is the output of the following PHP code snippet?

$x = 10;
if ($x == "10") {
  echo "Equal";
} else {
  echo "Not equal";
}

• Equal
• Not equal
• Nothing is outputted
• Error

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Question 25: Which of the following data types is used to store a single character in PHP?

• integer
• string
• boolean
• float

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