Data Encodings - Herong's Tutorial Examples

∟Base64 Encoding

∟Implementation of Base64 in PHP - Test

This section provides a test program for the default PHP implementation of the Base64 encoding algorithm - base64_encode() and base64_decode() functions.



The Base64 encoding algorithm bas been implemented in PHP language as 2 built-in functions since PHP 4:

To test these built-in functions, I wrote this simple testing program: 

<?php # PHP_Base64_Test.php
# Copyright (c) 2007 by Dr. Herong Yang, http://www.herongyang.com/
#

echo "\nTest 1:\n";
test("A", "QQ==");

echo "\nTest 2:\n";
test("AB", "QUI=");

echo "\nTest 3:\n";
test("ABC", "QUJD");

function test($theInput, $theExpected) {
   $theEncoded = base64_encode($theInput);
   $theDecoded = base64_decode($theEncoded);
   echo "   Input   : $theInput\n";
   echo "   Encoded : $theEncoded\n";
   echo "   Expected: $theExpected\n";
   echo "   Decoded : $theDecoded\n";
}
?>

Here is the test result: 

C:\herong\base64>php PHP_Base64_Test.php

Test 1:
   Input   : A
   Encoded : QQ==
   Expected: QQ==
   Decoded : A

Test 2:
   Input   : AB
   Encoded : QUI=
   Expected: QUI=
   Decoded : AB

Test 3:
   Input   : ABC
   Encoded : QUJD
   Expected: QUJD
   Decoded : ABC

The result matches my expectation perfectly.



 

Table of Contents

 About This Book

 UUEncode Encoding

►Base64 Encoding

 Base64 Encoding Algorithm

 W3C Implementation of Base64 in Java

 Sun Implementation of Base64 in Java

 Sun Implementation of Base64 in Java - Test

 Goetz' Implementation of Base64 in JavaScript

 Goetz' Implementation of Base64 in JavaScript - Test

►Implementation of Base64 in PHP - Test

 Base32 Encoding

 URL Encoding, URI Encoding, or Percent Encoding

 References

 Full Version in PDF/EPUB