(PHP Extension) Decode Base64 Image String (GIF, JPG, etc.) and Save to File

I have an XML response that includes a base 64 encoded image string (UPS label). It's a huge string and I need to save it as a gif file on my users pc.

This example shows how to do it..

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

$bd = new CkBinData();

//  I created an extra-small GIF image for this example..
$success = $bd->LoadFile('qa_data/gif/xsmall.gif');
if ($success != true) {
    print 'Failed to load GIF image file.' . "\n";
    exit;
}

//  Show GIF bytes as base64:
print $bd->getEncoded('base64') . "\n";

//  This particular GIF in base64 is this:
//  R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7

//  Let's begin with an XML string:
$x = '<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>';

$xml = new CkXml();
$success = $xml->LoadXml($x);

//  Get the base64 string:
$gifBase64 = $xml->getChildContent('def');

print $gifBase64 . "\n";

//  Load bd with the base64 decoded bytes.
$bd->Clear();
$bd->AppendEncoded($gifBase64,'base64');

//  Save to a GIF file.
$success = $bd->WriteFile('qa_output/xsmall.gif');

?>