Php/docs/xmlwriter.resources
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资源类型
Prior to PHP 8.0.0, there was one resource type used by the procedural version of the XMLWriter extension: returned by xmlwriter_open_memory() or xmlwriter_open_uri().
Prior to PHP 8.0.0, there was one resource type used by the procedural version of the XMLWriter extension: returned by xmlwriter_open_memory() or xmlwriter_open_uri().