PHP program to print PRIME numbers in a RANGE

OUTPUT

<?php
echo "
<form method='POST' action='' >
Range :<input type='text' name='range'>
<input type='submit' value='submit' name='submit'>
</form>
";
if(isset($_POST['submit']))
{
$n = $_POST['range'];
for($a=1;$a<=$n;$a++)
{
for($b=2;$b<$a;$b++)
{
if($a%$b==0)
{
break;
}
}
if($a==$b)
{
echo $a."<br />";
}
}
}
?>


OUTPUT