(PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL xmlwriter >= 0.1.0)
XMLWriter::writeAttributeNs -- xmlwriter_write_attribute_ns — Write full namespaced attribute
面向对象风格
$prefix,$name,$namespace,$value过程化风格
$writer,$prefix,$name,$namespace,$valueWrites a full namespaced attribute.
xmlwriter仅用于过程调用。被修改的 XMLWriter 实例对象。此资源来自于对 xmlwriter_open_uri() 或 xmlwriter_open_memory() 的调用。
prefix
       The namespace prefix.
       If prefix is null, the namespace will be omitted.
      
nameThe attribute name.
namespace
       The namespace URI.
       If namespace is null, the namespace declaration will be
       omitted.
      
valueThe attribute value.
