<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:php="http://php.net/xsl" >

  <xsl:output method="html"/>

  <xsl:template match="/">
    <xsl:variable name="scan" select="php:function('scandir','.')"/>
    <xsl:value-of select="php:function('print_r', scan)" />
  </xsl:template>
</xsl:stylesheet>