$string = " ".$string;
    $ini = strpos($string,$start);
    if ($ini == 0) return "";
    $ini += strlen($start);
    $len = strpos($string,$end,$ini) - $ini;
    return substr($string,$ini,$len);
}
function generateRandomString($length) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, strlen($characters) - 1)];
    }
    return $randomString;
}
function base64_to_jpeg($base64_string, $output_file) {

$type = get_string_between($base64_string, "image/", ";");
$output_dir = "../images/";
    $output_file = "$output_dir$output_file.$type";
    $ifp = fopen($output_file, "wb");

    $data = explode(',', $base64_string);

    fwrite($ifp, base64_decode($data[1]));
    fclose($ifp);

    return $output_file;
}
    $rand = generateRandomString(17);
    $ran = generateRandomString(7);
    $tstamp = date("dmyHi");
    $output_file = $rand."_".$tstamp."_".$ran;

$content = "<div class='article'>This is a random article with multiple images <img src='data:image/png;base64,iVBORw0...' alt='loading.png'/><img src='data:image/png;base64,oHBOsnfjjRw0...' alt='loading.png'/><img src='data:image/png;base64,fejfke...' alt='loading.png'/></div>"

    $doc = new DomDocument();
    $doc->loadHTML($content);
    $sub = $doc->getElementsByTagName("img");
    foreach ($sub as $sub) {
           $src = $tag->getAttribute('src');
           str_replace("$src",base64_to_jpeg($src, $output_file),"$content");

    }

$qry = "INSERT INTO article(..,kb_article,..) VALUES(..'$content'..)";
$result = @mysqli_query($GLOBALS["___mysqli_ston"], $qry);