Object oriented style:
class XMLWriter {Procedural style:
bool xmlwriter_write_pi ( resource xmlwriter, string target, string content )Writes a processing instruction.
xmlwriter
Apenas para chamadas de procedimentos. O recurso XMLWriter resource que esta sendo modificado. Este recurso vem de uma chamada a xmlwriter_open_uri() ou xmlwriter_open_memory().
target
The target of the processing instruction.
content
The content of the processing instruction.