Examples of Encoding & Decoding Encrypted PHP

This is a concise summary of the article Encoding and Decoding Encrypted PHP Code, which explains further the encoding/decoding examples presented here. These examples are a quick reference for those familar with PHP.

Example using a string of text

$string = 'Encoding and Decoding Encrypted PHP Code';

str_rot13 encode/decode

str_rot13($string): Rapbqvat naq Qrpbqvat Rapelcgrq CUC Pbqr
str_rot13(str_rot13($string)): Encoding and Decoding Encrypted PHP Code

base64_encode/base64_decode

base64_encode($string): RW5jb2RpbmcgYW5kIERlY29kaW5nIEVuY3J5cHRlZCBQSFAgQ29kZQ==
base64_decode(base64_encode($string)): Encoding and Decoding Encrypted PHP Code

gzinflate/gzdeflate

gzdeflate($string): sÍKÎOÉÌKWHÌKQpI…r\ó’‹*JRS<œóSR
gzinflate(gzdeflate($string)): Encoding and Decoding Encrypted PHP Code

Combined encoding: gzinflate(str_rot13(base64_decode()))

Decoding strings that have been encoded with combinations of these functions look like this:

eval(gzinflate(base64_decode($string)));
eval(gzinflate(str_rot13(base64_decode($string))));

Depending on your experience level, decoding strings of this variety can be tricky. The easiest way to decode such a string is to use any reputable online decoding tool ;)

Example using PHP’s date() function

$date = Sat, 19 Sep 26 09:53:45 +0000;

str_rot13 encode/decode

str_rot13($date): Fng, 19 Frc 26 09:53:45 +0000
str_rot13(str_rot13($date)): Sat, 19 Sep 26 09:53:45 +0000

base64_encode/base64_decode

base64_encode($date): U2F0LCAxOSBTZXAgMjYgMDk6NTM6NDUgKzAwMDA=
base64_decode(base64_encode($date)): Sat, 19 Sep 26 09:53:45 +0000

gzinflate/gzdeflate

gzdeflate($date): N,ÑQ0´TN-P02S0°´25¶21UÐ6
gzinflate(gzdeflate($date)): Sat, 19 Sep 26 09:53:45 +0000

For more information, see the original article, Encoding and Decoding Encrypted PHP Code.