This blog describes how to find prime numbers between 1 and
100 using PHP. Prime number is a number which is divided by 1 and itself. Consider the number 5. It is prime number
because it can be divided by 1 and 5.

### PHP program for prime numbers:

Consider the
below program which is used to find prime numbers from 1 to 100.

<?php

for($i = 1; $i <= 100; $i++)

$mm = 0;

for($j = 2; $j <= $i/2; $j++) {

//only not prime numbers

if ($i % $j == 0) {

$mm++;

break;

}

}

if ($mm == 0) {

echo"$i is prime number<br/>";

}

}

?>

for($i = 1; $i <= 100; $i++)

$mm = 0;

for($j = 2; $j <= $i/2; $j++) {

//only not prime numbers

if ($i % $j == 0) {

$mm++;

break;

}

}

if ($mm == 0) {

echo"$i is prime number<br/>";

}

}

?>

In above
program, if a number is divided by any number except 1 and itself, then it is
not prime number. Otherwise it is a prime number.

Now you got prime numbers between 1 and 100 using PHP.

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