高亮度显示ｐｈｐ源代码

高亮度显示ｐｈｐ源代码 <?php
function HeighPHPcode($Heightstring){
do{
   $z=0;
   if(preg_match('/<phpcode>(.*?)</phpcode>/s',$Heightstring,$reg)) {
     $z=1;
     $code='';
     ob_start();
     highlight_string($reg[1]);
     $code = ob_get_contents();
     ob_end_clean();
     $reg[1] = addslashes($reg[1]);
     $Heightstring=preg_replace("/<phpcode>(.*?)</phpcode>/s","$code",$Heightstring,1);
    }
}while($z);
return $Heightstring;
}
##########################################################################################
#$PHPcode就是要被加亮的代码
$PHPcode= <<<END
<phpcode>
<?php
function HeighPHPcode($Heightstring){
do{
   $z=0;
   if(preg_match('/<phpcode>(.*?)</phpcode>/s',$Heightstring,$reg)) {
     $z=1;
     $code='';
     ob_start();
     highlight_string($reg[1]);
     $code = ob_get_contents();
     ob_end_clean();
     $reg[1] = addslashes($reg[1]);
     $Heightstring=preg_replace("/<phpcode>(.*?)</phpcode>/s","$code",$Heightstring,1);
    }
}while($z);
return $Heightstring;
}
</phpcode>
END;
##########################################################################################
echo   HeighPHPcode("$PHPcode");
?>