svg文件文本结构需要为readImageBlob指定以解码文件. 在具有cvg文本的变量前加上<?xml version="1.0" encoding="UTF-8" standalone="no"?>.

svg file text structure needs to be specified for readImageBlob to decode the file. Prepend <?xml version="1.0" encoding="UTF-8" standalone="no"?> to your variable having svg text.

$svg = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>'.$svg;

你很好.