PHP Built-In Implementation of Base64

Data Encoding Tutorials - Herong's Tutorial Examples

∟PHP Built-In Implementation of Base64

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:

base64_encode() - Encodes data with the Base64 algorithm from bytes to string.
base64_decode() - Decodes data with the Base64 algorithm from string to bytes.

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

<?php
# Base64_Encode_Test.php
# Copyright (c) 2010 HerongYang.com. All Rights Reserved.

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

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

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

echo "Test 4:\n";
$theInput = "The quick brown fox jumps over the lazy dog.";
$theExpected = 
  "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=";
test($theInput, $theExpected);

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:

herong> php Base64_Encode_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
Test 4:
   Input   : The quick brown fox jumps over the lazy dog.
   Encoded : VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=
   Expected: VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=
   Decoded : The quick brown fox jumps over the lazy dog.