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List Prime Numbers

List all prime numbers until the number that you enter.

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The PHP code behind it

Here is the PHP function to check if a number is a prime number. It returns true if the number is a prime number, otherwise it returns false.

function isa_is_prime( $num ) {
	$isPrime = true; 
	for ($i = 2; $i <= $num/2; $i++) {
		if ($num % $i == 0) {
			$isPrime = false;
			break;
		}
	}
	return $isPrime;
}

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