Practice 50 PHP Functions Programming Questions

Practice 50 PHP Functions Programming Questions

Q1: Write a function to add two numbers and return the result.  
Input: add(5, 10)  
Expected Output:  
15

Q2: Write a function to check if a number is even or odd.  
Input: checkEvenOdd(7)  
Expected Output:  
Odd

Q3: Write a function to calculate the square of a number.  
Input: square(4)  
Expected Output:  
16

Q4: Write a function to return the larger of two numbers.  
Input: maxNumber(8, 3)  
Expected Output:  
8

Q5: Write a function to reverse a string.  
Input: reverseString("Hello")  
Expected Output:  
olleH

Q6: Write a function to check if a string is a palindrome.  
Input: isPalindrome("radar")  
Expected Output:  
True

Q7: Write a function to find the factorial of a number.  
Input: factorial(5)  
Expected Output:  
120

Q8: Write a function to calculate the power of a number.  
Input: power(2, 3)  
Expected Output:  
8

Q9: Write a function to convert Celsius to Fahrenheit.  
Input: celsiusToFahrenheit(25)  
Expected Output:  
77

Q10: Write a function to check if a number is prime.  
Input: isPrime(13)  
Expected Output:  
True

Q11: Write a function to find the sum of all elements in an array.  
Input: sumArray([1, 2, 3, 4, 5])  
Expected Output:  
15

Q12: Write a function to find the largest number in an array.  
Input: maxArray([3, 5, 7, 2, 8])  
Expected Output:  
8

Q13: Write a function to count the vowels in a string.  
Input: countVowels("Hello World")  
Expected Output:  
3

Q14: Write a function to generate the Fibonacci series up to N terms.  
Input: fibonacci(5)  
Expected Output:  
0 1 1 2 3

Q15: Write a function to return the length of a string.  
Input: stringLength("Programming")  
Expected Output:  
11

Q16: Write a function to check if a number is positive, negative, or zero.  
Input: checkNumber(-5)  
Expected Output:  
Negative

Q17: Write a function to calculate the area of a circle.  
Input: circleArea(7)  
Expected Output:  
153.93804002589985

Q18: Write a function to find the second largest number in an array.  
Input: secondLargest([10, 20, 15, 30, 25])  
Expected Output:  
25

Q19: Write a function to check if a string contains only alphabets.  
Input: isAlphabet("Hello123")  
Expected Output:  
False

Q20: Write a function to return the sum of digits of a number.  
Input: sumOfDigits(12345)  
Expected Output:  
15

Q21: Write a function to return the maximum and minimum elements in an array.  
Input: findMinMax([4, 7, 2, 9, 1])  
Expected Output:  
Max = 9, Min = 1

Q22: Write a function to calculate the GCD of two numbers.  
Input: gcd(12, 18)  
Expected Output:  
6

Q23: Write a function to calculate the LCM of two numbers.  
Input: lcm(4, 6)  
Expected Output:  
12

Q24: Write a function to capitalize the first letter of each word in a string.  
Input: capitalizeWords("hello world")  
Expected Output:  
Hello World

Q25: Write a function to check if a number is an Armstrong number.  
Input: isArmstrong(153)  
Expected Output:  
True

Q26: Write a function to sort an array in ascending order.  
Input: sortArray([5, 3, 8, 1, 2])  
Expected Output:  
[1, 2, 3, 5, 8]

Q27: Write a function to merge two arrays into one.  
Input: mergeArrays([1, 2], [3, 4])  
Expected Output:  
[1, 2, 3, 4]

Q28: Write a function to find the first N prime numbers.  
Input: firstNPrimes(5)  
Expected Output:  
[2, 3, 5, 7, 11]

Q29: Write a function to replace all occurrences of a word in a string.  
Input: replaceWord("Hello World", "World", "PHP")  
Expected Output:  
Hello PHP

Q30: Write a function to count the frequency of elements in an array.  
Input: countFrequency([1, 2, 2, 3, 3, 3])  
Expected Output:  
1: 1, 2: 2, 3: 3

Q31: Write a function to remove duplicates from an array.  
Input: removeDuplicates([1, 2, 2, 3, 4, 4, 5])  
Expected Output:  
[1, 2, 3, 4, 5]

Q32: Write a function to check if a string starts with a specific substring.  
Input: startsWith("Hello World", "Hello")  
Expected Output:  
True

Q33: Write a function to check if a string ends with a specific substring.  
Input: endsWith("Hello World", "World")  
Expected Output:  
True

Q34: Write a function to calculate the sum of squares of elements in an array.  
Input: sumOfSquares([1, 2, 3, 4])  
Expected Output:  
30

Q35: Write a function to count the number of words in a string.  
Input: wordCount("PHP is fun")  
Expected Output:  
3

Q36: Write a function to find the index of an element in an array.  
Input: findIndex([10, 20, 30, 40], 30)  
Expected Output:  
2

Q37: Write a function to calculate the average of numbers in an array.  
Input: average([10, 20, 30, 40, 50])  
Expected Output:  
30

Q38: Write a function to determine if a year is a leap year.  
Input: isLeapYear(2024)  
Expected Output:  
True

Q39: Write a function to concatenate two strings.  
Input: concatStrings("PHP", "Programming")  
Expected Output:  
PHPProgramming

Q40: Write a function to convert a string to uppercase.  
Input: toUpperCase("hello")  
Expected Output:  
HELLO

Q41: Write a function to convert a string to lowercase.  
Input: toLowerCase("HELLO")  
Expected Output:  
hello

Q42: Write a function to check if an array is sorted in ascending order.  
Input: isSorted([1, 2, 3, 4, 5])  
Expected Output:  
True

Q43: Write a function to find the median of numbers in an array.  
Input: median([5, 3, 8, 1, 2])  
Expected Output:  
3

Q44: Write a function to count the number of occurrences of a character in a string.  
Input: countCharacter("Hello World", "o")  
Expected Output:  
2

Q45: Write a function to check if a number is a perfect number.  
Input: isPerfect(28)  
Expected Output:  
True

Q46: Write a function to return the first N elements of an array.  
Input: firstNElements([10, 20, 30, 40, 50], 3)  
Expected Output:  
[10, 20, 30]

Q47: Write a function to check if an array contains a specific value.  
Input: containsValue([1, 2, 3, 4], 3)  
Expected Output:  
True

Q48: Write a function to split a string into an array of words.  
Input: splitString("Learn PHP Functions")  
Expected Output:  
["Learn", "PHP", "Functions"]

Q49: Write a function to find the intersection of two arrays.  
Input: findIntersection([1, 2, 3], [2, 3, 4])  
Expected Output:  
[2, 3]

Q50: Write a function to find the union of two arrays.  
Input: findUnion([1, 2, 3], [2, 3, 4])  
Expected Output:  
[1, 2, 3, 4]