XSLT 模板中的常规 PHP 代码，可能吗?

我想知道是否可以以及如何在我的 XSLT 模板中包含代码...我知道我可以使用 <xsl:choose> 但这不能满足我的需求，我想要添加函数、变量等...

I wonder If I can and how can I include code inside my XSLT template... I know I can use <xsl:choose> but that doesn't satisfy my needs, I want to add functions, variables etc...

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

<xsl:output method="html" encoding="UTF-8" indent="yes"/>  

<xsl:template match="BackgroundReportPackage">

<!--- here i would like to add code like ---->

if ($dateofcharge < 7) {
return '

<xsl:for-each select="Charge">
            <table class="special2" cellpadding="0">
                <tr class="tr-border-bottom">
                    <td class="front-td-text" valign="top">Charge ID: </td>
                    <td class="minimalec">
                    <xsl:value-of select="ChargeId"/>           
                    </td>
                </tr>

                <tr class="tr-border-bottom">
                    <td class="front-td-text" valign="top">Charge Type Classification: </td>
                    <td class="minimalec">
                    <xsl:value-of select="ChargeTypeClassification"/>
                    </td>
                </tr>                   

            </table>

';          
} else {
 do nothing
 }

 <!--- keep in mind that this code i've added is just for presentational purposes TO show you, how i want to use php code --->

</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

希望大家帮忙！