PHP Prime Number Program

by Online Tutorials Library July 22, 2022

Prime Number

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.

  <?php  $count = 0;  $num = 2;  while ($count < 15 )  {  $div_count=0;  for ( $i=1; $i<=$num; $i++)  {  if (($num%$i)==0)  {  $div_count++;  }  }  if ($div_count<3)  {  echo $num.” , “;  $count=$count+1;  }  $num=$num+1;  }  ?>  

Output:

PHP Prime number 1

Prime Number using Form in PHP

Example:

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

  <form method=”post”>  Enter a Number: <input type=”text” name=”input”><br><br>  <input type=”submit” name=”submit” value=”Submit”>  </form>  <?php  if($_POST)  {  $input=$_POST[‘input’];  for ($i = 2; $i <= $input-1; $i++) {        if ($input % $i == 0) {        $value= True;        }  }  if (isset($value) && $value) {       echo ‘The Number ‘. $input . ‘ is not prime’;  }  else {     echo ‘The Number ‘. $input . ‘ is prime’;     }   }  ?>  

Output:

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

PHP Prime number 2

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

PHP Prime number 3

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