function encrypt_caesar returns string of characters encrypted by Caesars method.
This is done by shifting characters from string your_text by an intnumber.
Opposite to this function is function decrypt_caesar.
<?php
echo encrypt_caesar("THIS IS CAESAR ENCRYPTION!", 10)."<br>"; // Increments the number of characters
echo decrypt_caesar("THIS IS CAESAR DECRYPTION!", 10)."<br>"; // Decrements the number of characters
//for a better example:
$_enc = encrypt_caesar("THIS IS CAESAR ENCRYPTION!",10);
$_dec = decrypt_caesar($_enc,10);
echo "<br>". $_enc." == ".$_dec;
?>