PHP functions - Exercises, Practice, Solution

PHP functions [ 6 exercises with solution]

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1. Write a function to calculate the factorial of a number (a non-negative integer). The function accepts the number as an argument.

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2. Write a function to check whether a number is prime or not.
Note: A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.

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3. Write a function to reverse a string.

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4. Write a function to sort an array.

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5. Write a PHP function that checks whether a string is all lowercase.
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6. Write a PHP function that checks whether a passed string is a palindrome or not?
A palindrome is a word, phrase, or sequence that reads the same backward as forward, e.g., madam or nurses run.

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