CAT-2 (PART -C=> Ceaser cipher)

<?php

function encrypt($text, $s)
{
	$result = "";
	for ($i = 0; $i < strlen($text); $i++)
	{
	
		if (ctype_upper($text[$i]))
			$result = $result.chr((ord($text[$i]) + $s - 65) % 26 + 65);

	
	else
		$result = $result.chr((ord($text[$i]) +
						$s - 97) % 26 + 97);
	}

	return $result;
}


$text = "zotopia";
$s = 5;
echo "Text : " . $text;
echo "\nShift: " . $s;
echo "\nCipher: " . encrypt($text, $s);

?>