Web Developer

<?php

$base64 = "iVBORw0KGgoAAAANSUhEUgAAABw"
  . "AAAASAQMAAAByySynAAAABlBMVEUAAAD///+l2Z/dAAAAP0lEQVQImWN"
  . "gPm9gwAAmbM4bH4AQzAdAYiDC/rzxByTi/+f/cIL5AwPnZGYGIGHMwGA"
  . "5mdkASNgbMNgJ80AIAMCSHqNvm2VtAAAAAElFTkSuQmCC";

function get_img_type($data) {
  $n = array(1,1,2,3);
  $e = array("474946383761","474946383961","ffd8ff","89504e470d0a1a0a");
  for ($i=0; $i<4; $i++) {
    if (strtolower(bin2hex(substr($data,0,strlen($e[$i])/2)))==$e[$i]) return $n[$i];
  }
  return NULL;
}

$data = base64_decode($base64);
$tp = get_img_type($data);

if ($tp) {
  $img = imagecreatefromstring($data);
  if ($img !== false) {
    $type = array("gif","jpeg","png");
    header("Content-Type: image/" . $type[$tp-1]);
    if ($tp==1) imagegif($img);
    if ($tp==2) imagejpeg($img);
    if ($tp==3) imagepng($img);
    imagedestroy($img);
  } else {
    echo "An error occurred.";
  }
} else {
  echo "Invalid format! Only GIF, JPEG and PNG.";
}

?>