$fileExtension = '.jpg';
$replaceMime = 'data:image/jpeg;base64,';
if (strpos($image['src'], 'data:image/png;') !== false) {
    $fileExtension = ".png";
    $replaceMime = 'data:image/png;base64,';
}

// base64 decode and save to file
$base64Image = str_replace($replaceMime, "", $image['src']);
file_put_contents($imageLocation, base64_decode($base64Image));