PHP MCQs - 8

What is the purpose of the array_search() function in PHP?

• A) Searches for a value in an array and returns its key
• B) Searches for a key in an array and returns its value
• C) Reverses the order of elements in an array
• D) Checks if a value exists in an array

Answer: A) Searches for a value in an array and returns its key

What is the output of the following code snippet?

$str = "Hello"; echo strtoupper($str); 

• A) hello
• B) Hello
• C) HELLO
• D) Error

Answer: C) HELLO

Which of the following PHP functions is used to remove elements from the end of an array?

• A) array_pop()
• B) array_push()
• C) array_shift()
• D) array_unshift()

Answer: A) array_pop()

What is the purpose of the parse_str() function in PHP?

• A) Parses a URL
• B) Parses query string into variables
• C) Parses JSON string into an array
• D) Parses XML string into an object

Answer: B) Parses query string into variables

Which of the following is used to access the first character of a string in PHP?

• A) $string[0]
• B) $string(0)
• C) substr($string, 0, 1)
• D) substr($string, 1, 0)

Answer: A) $string[0]

What is the output of the following code snippet?

$a = 5;
$b = 10;
echo "The sum of $a and $b is " . ($a + $b);

• A) The sum of 5 and 10 is 15
• B) The sum of $a and $b is 15
• C) The sum of 5 and 10 is $a + $b
• D) Error

Answer: A) The sum of 5 and 10 is 15

Which of the following PHP functions is used to sort an array in ascending order?

• A) sort()
• B) rsort()
• C) asort()
• D) ksort()

Answer: A) sort()

What is the purpose of the json_decode() function in PHP?

• A) Converts a JSON string into an array
• B) Converts an array into a JSON string
• C) Encodes data using MIME base64
• D) Parses a URL

Answer: A) Converts a JSON string into an array

What is the output of the following code snippet?

$str = "Hello, World!";
echo str_replace("World", "PHP", $str);

• A) Hello, PHP!
• B) PHP, World!
• C) Hello, World!
• D) Error

Answer: A) Hello, PHP!

Which of the following PHP functions is used to generate a random number?

• A) random()
• B) rand()
• C) random_number()
• D) generate_random()

Answer: B) rand()