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Prime Number Coding IN PHP

In this post, you will learn about programming for prime numbers and get the prime numbers between two number ranges.



A prime number is a whole number greater than 1 whose only factors are 1 and itself

Prime Number in PHP with examples

 

Let us find the prime number between 1- 100 using the PHP script. Here, we have created a function ‘IsPrime()’ to check whether the number is prime or not. now we need to call the function passing the value from 1 – 100 by applying a loop in PHP.



Example-1

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  <?php
  function IsPrime($num){
    if ($num == 1)
    return 0;
    for ($i = 2; $i <= $num/2; $i++)
    {
    if ($num % $i == 0)
    return 0;
    }
    return 1;
  }
 
 
  for($num = 1; $num <= 100; $num++) {
  $flag = IsPrime($num);
  if ($flag == 1) {
  echo $num." ";
  }
  }
  ?>
 
 
 

 

Output:

1
2
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
 

 



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