Prime number in php w3schools

PHP program to check prime number:

The below program checks if a number is a prime or a composite number. The PHP echo statement is used to output the result on the screen.
Example

DOCTYPE html>

Output

13 is a prime number.

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Last update on August 19 2022 21:50:29 [UTC/GMT +8 hours]

PHP function: Exercise-2 with Solution

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.

Pictorial Presentation:

Sample Solution:

PHP Code:

Sample Output:

This is a Prime Number..

Flowchart :

PHP Code Editor:

Have another way to solve this solution? Contribute your code [and comments] through Disqus.

Previous: Write a function to calculate the factorial of a number [a non-negative integer]. The function accepts the number as an argument.
Next: Write a function to reverse a string.

What is the difficulty level of this exercise?

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A number which is only divisible by 1 and itself is called prime number. Numbers 2, 3, 5, 7, 11, 13, 17, etc. are prime numbers.

2 is the only even prime number.
It is a natural number greater than 1 and so 0 and 1 are not prime numbers.

Prime number in PHP

Example:

Here is the Program to list the first 15 prime numbers.

Output:

Prime Number using Form in PHP

Example:

We'll show a form, which will check whether a number is prime or not.

Output:

On entering number 12, we get the following output. It states that 12 is not a prime number.

On entering number 97, we get the following output. It states that 97 is a prime number.

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What is prime number in php?

A number which is only divisible by 1 and itself is called prime number. Numbers 2, 3, 5, 7, 11, 13, 17, etc. are prime numbers.

How do you check a number is prime or not in php?

php function check_prime[$num] { if [$num == 1] return 0; for [$i = 2; $i

How do you check if a number is prime?

How do you know a prime number? If a number has only two factors 1 and itself, then the number is prime. Hence, by prime factorisation of the given number, we can easily determine a prime number.

What is php and example?

PHP is a server-side scripting language created in 1995 by Rasmus Lerdorf. PHP is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.