$im = new Imagick($upload_path . $file_name);
$svg = file_get_contents($upload_path . $file_name);
$svg = '<"1.0" encoding="UTF-8" standalone="no""png24");
$srcImage = $im->getImageGeometry(); //获取源图片宽和高
$im->resizeImage($srcImage['width'], $srcImage['height'], imagick::FILTER_LANCZOS, 1, false);
$im->writeImage($upload_path.'/'.$topng_name.'.png');
$im->clear();
$im->destroy();

function drawInlineSVG($svg, callback) {
  var svg = $svg;
  var parser = new DOMParser();
  var doc = parser.parseFromString(svg, "text/xml");
  svg = doc.getElementsByTagName('svg');
  svg = svg[0];
  svg.innerHTML = '<rect width="100%" height="100%" fill="#ffffff"></rect>' + svg.innerHTML;
  var svgData = new XMLSerializer().serializeToString( svg );
  var img = document.createElement( "img" );
  img.setAttribute( "src", "data:image/svg+xml;base64," + btoa( unescape(encodeURIComponent(svgData)) ) );
  img.onload = function () {
    var canvas = document.createElement( "canvas" );
    canvas.width = img.width;
    canvas.height = img.height;
    var ctx = canvas.getContext( "2d" ); //取得画布的2d绘图上下文
    ctx.drawImage( img, 0, 0 );
    canvas.toDataURL( "image/png" );
    var base64Src = canvas.toDataURL( "image/png" );
    callback && callback(base64Src); // 调用回掉函数
  };
 return;
}

/* base64格式编码转换为图片并保存对应文件夹 */
function base64_image_content($base64_image_content,$path, $file_name = ''){
  //匹配出图片的格式
  if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){
    if(!file_exists($path)){
      // 路径不存在
     return false;
    }
    $new_file = $path . $file_name;
    if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){
      return '/'.$new_file;
    }else{
      return false;
    }
  }else{
    return false;
  }
}