Let’s say we want to “gzdeflate” the following string: Here is an example that returns the original string to a variable named $decoded:Ĭopy/paste example (try for yourself): Deflate and inflate with gzdeflate() & gzinflate()Ī third visit to the PHP docs gives us our third function, gzdeflate() is used to “compress the given string using the DEFLATE data format.” Again, not gonna veer off - let’s stay focused with a quick example. Now to decode a string encoded with base64_encode, we use the converse function, base64_decode. RW5jb2RpbmcgYW5kIERlY29kaW5nIEVuY3J5cHRlZCBQSFAgQ29kZQ=Īs you may count, the base64-encoded string contains around 33% more data than the original.
We run this string through base64_encode() and set it as a variable named $encoded like so: Let’s say we want to encode the following string with base64:
Let’s get back on track with a quick example showing how base64_encode() works its magic. This encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean, such as mail bodies.Īhh, I love taking stuff out of context, but I digress. Here is an example that returns the original string to a variable named $decoded:Įchoing $decoded, we see the original string as expected:Ĭopy/paste example (try it for yourself): Encode and decode with base64_encode() & base64_decode()Īlso explained in the PHP documentation, the base64_encode() function “encodes the given data with base64.” Rather than get into the mechanics of encoding with base64, I’ll repeat the enigmatic haiku given in the docs: To decode a string encoded with str_rot13(), we simply run it back through the function to restore the original string. We run this string through str_rot13() and set it as a variable named $encoded like so:Įchoing the $encoded variable to the browser, we get this string of gibberish: Let’s say we want to ROT13-encode the following string: This type of encoding is called ROT13 encoding and it’s very straightforward using the str_rot13() function. Quick examples of encoding/decoding PHPĪs explained in the PHP documentation, str_rot13() is a simple function used for rotating every letter “13 places in the alphabet” while ignoring non-alphanumeric characters.Online tools for decoding/encoding PHP code.Combined example: gzinflate(str_rot13(base64_decode())).
Deflate and inflate with gzdeflate() & gzinflate().Encode and decode with base64_encode() & base64_decode().The article here is intended as a “behind-the-scenes” look at the decoding and encoding happening on the examples page. For those involved in the securing of websites, understanding how these functions are used to encode and decode encrypted chunks of PHP data is critical to accurate monitoring and expedient attack recovery.įor those already familiar with the concept, but could use a quick reference with examples, I put together a concise summary of this article. From the perspective of site security, there are three PHP functions - str_rot13(), base64_encode(), and gzinflate - that are frequently used to obfuscate malicious strings of PHP code. There are many ways to encode and decode PHP code.
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