(PHP 5 >= 5.1.2, PECL xmlwriter >= 0.1.0)
XMLWriter::writePI -- xmlwriter_write_pi — Writes a PI
Object oriented style
$target
   , string $content
   )Procedural style
$xmlwriter
   , string $target
   , string $content
   )Writes a processing instruction.
xmlwriterOnly for procedural calls. The XMLWriter resource that is being modified. This resource comes from a call to xmlwriter_open_uri() or xmlwriter_open_memory().
targetThe target of the processing instruction.
contentThe content of the processing instruction.
   Returns TRUE on success or FALSE on failure.