<?php
$chars = [
'a' => 'c',
'b' => 'd',
'c' => 'a',
'd' => 'e',
'e' => 'b',
];
$original = 'acdcxx';
// Encrypt
$encrypted = '';
for ($i = 0; $i < strlen($original); $i++) {
// If we find the character in our mapping array, use the mapped character.
// If not, let's use the original character.
$encrypted .= array_key_exists($original[$i], $chars)
? $chars[$original[$i]]
: $original[$i];
}
print_r($encrypted);
// Decrypt
$decrypted = '';
for ($i = 0; $i < strlen($encrypted); $i++) {
// Find the correct key
$key = array_search($encrypted[$i], $chars);
// If the character existed, use the key.
// If not, use the original character.
$decrypted .= $key !== false
? $key
: $encrypted[$i];
}
echo PHP_EOL;
print_r($decrypted);
- Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.3
- caeaxx
acdcxx
preferences:
140.34 ms | 408 KiB | 5 Q