php如何实现svg转化png

1.php imagick扩展插件
a.研究imagick插件方法
[php]
$im = new Imagick($upload_path . $file_name);
$svg = file_get_contents($upload_path . $file_name);
$svg = ''.$svg;
$im->readImageBlob($svg);
// png settings
$im->setImageFormat("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();
[/php]

b.遇到的问题
svg图片可以成功转化为png格式图片,但png图片存在问题:
1)线段丢失;
2)字体不展示;
3)svg文件中style标签样式不能解析;

2.弃用imagick插件,改为svg转canvas转png

a.svg转canvas
[php]
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 = '' + 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;
}
[/php]

b.canvas转png(base64Src转化为png)
[php]
/* 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;
}
}
[/php]

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