Using PHP post for simple prime number program [closed] - php

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I can make a simple set of IF statements to find whether a number is either a composite or a prime (even though I think a function would be better suited).
However, I can't echo out either statement below when I try to up-my-game and use post.
There are no syntax errors here, just flawed logic. Problem is, where is the flaw??
Thanks for any advice.
<form>
<form name="PrimeCalculator" method="post" action="">
<input type="text" name="input"> Enter any number to see if it's a Prime or Composite<br />
<input type="submit" name="submit" value="Calculate">
</form>
<?PHP
if($_POST['submit'] == "Calculate"){
$num=$_POST["input"];
for ($i = 2; $i <= $num-1; $i++) {
if ($num % $i == 0) {
$value= True;
}
}
if ($value) {
echo 'The Number '. $num . ' Is A Composite';
} else {
echo 'The Number '. $num . ' Is A Prime';
}
}
?>

Answer 1

Your error actually is in the html, remove the first <form> tag and it should work, though your code is throwing
E_NOTICE : type 8 -- Undefined variable: value -- at line 14
when entering a prime number as $value isn't set then.
You can use
if (isset($value) && $value)
for the check instead.
<form name="PrimeCalculator" method="post" action="">
<input type="text" name="input"> Enter any number to see if it's a Prime or Composite<br />
<input type="submit" name="submit" value="Calculate">
</form>