How can the use of arrays and loops in PHP scripts enhance the efficiency of Caesar encryption and decryption processes?

Using arrays and loops in PHP scripts can enhance the efficiency of Caesar encryption and decryption processes by allowing for a more streamlined and automated approach to shifting characters. By storing the alphabet in an array and iterating through it using a loop, we can easily shift characters based on the specified key. This eliminates the need for manual character comparisons and calculations, making the encryption and decryption processes more efficient. 

function caesarEncrypt($text, $key) {
    $alphabet = range('A', 'Z');
    $result = '';

    foreach(str_split($text) as $char) {
        if(in_array(strtoupper($char), $alphabet)) {
            $index = array_search(strtoupper($char), $alphabet);
            $shifted = ($index + $key) % 26;
            $result .= $alphabet[$shifted];
        } else {
            $result .= $char;
        }
    }

    return $result;
}

function caesarDecrypt($text, $key) {
    return caesarEncrypt($text, 26 - $key);
}

$text = "HELLO";
$key = 3;

$encryptedText = caesarEncrypt($text, $key);
$decryptedText = caesarDecrypt($encryptedText, $key);

echo "Original Text: $text\n";
echo "Encrypted Text: $encryptedText\n";
echo "Decrypted Text: $decryptedText\n";

Keywords

arrays loops PHP scripts Caesar encryption decryption

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