รบกวนช่วยอธิบาย code หน่อยคะ เกี่ยวกับ php+oracle ต้องพัฒนาต่อแต่ไม่เข้าใจค่ะ ขอบคุณมากค่ะ

<?
include ("Carlendar.php"); 
include ("config.inc.php");
$S="$";
$DV="DIAG".$S."VISIT";
$DV_VSTDATE="DIAG".$S."VISIT"."."."VSTDATE";
$DV_ID_STF="DIAG".$S."VISIT"."."."ID_STF".$S."DCT".$S;
$STF="STF";
$STF_ID="STF"."."."ID";
$STF_COD="STF"."."."CODE";
$STF_PIN="STF"."."."PIN".$S."CODE";
$STF_FNAME="STF"."."."FNAME";
$STF_PNAME="STF"."."."PNAME";
$STF_LNAME="STF"."."."LNAME";
//=============================================================================

$strSQL = " SELECT DISTINCT PTTYPE.ID as IDD ,PTTYPE.NAME as IDN
FROM  PTTYPE 
WHERE PTTYPE.ID <> '4'
AND PTTYPE.ID <> '11'
AND PTTYPE.ID <> '45'
AND PTTYPE.ID <> '51'
AND PTTYPE.ID <> '54'
AND PTTYPE.ID <> '56'
AND PTTYPE.ID <> '80'
AND PTTYPE.ID <> '81'
AND PTTYPE.ID <> '101'
ORDER BY PTTYPE.NAME";
$objParse = ociparse($objConnect, $strSQL);
ociexecute ($objParse,OCI_DEFAULT);
//=====================================, $VS_ADDRPART, $VS_MOOPART, $AC_NAME, $AC_PRO,
 ?>
<table width="1018" border="0" align="center" cellpadding="0" cellspacing="0">
  <!--DWLayoutTable-->
  <tr>
    <td width="37" rowspan="4" valign="top" background="pic/left.jpg"><!--DWLayoutEmptyCell-->&nbsp;</td>
    <td height="25" colspan="3" valign="top"><span class="fmenu">
      <?include ('head.php');?>
    </span></td>
  <td width="37" rowspan="4" valign="top" background="pic/right.jpg"><!--DWLayoutEmptyCell-->&nbsp;</td>
  </tr>
  <tr>
    <td height="28" colspan="3" valign="top" background="pic/bar.jpg"><a href="file:///C|/AppServ/www/ADMIT/ADMIT_MED.html"></a></td>
  </tr>
  <tr>
    <td width="17" height="334">&nbsp;</td>
    <td width="912" valign="top"><div align="center">
      <p align="center" class="fmenu">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />
        <form id="form1" name="form1" method="post" action="select.php">
            <table width="384" border="1" align="center" cellpadding="0" cellspacing="1" bordercolor="#33CC33">
              <tr>
                <th width="185"><span class="f_nor">ตั้งแต่วันที่</span></th>
                <th width="193" height="50">
                  <div align="left">
                    <input name="dfrom" id="dfrom" size="15"  />
                  <a href="javascript:displayDatePicker('dfrom')"> <img border="0" src="pic/formcal.gif" width="16" height="16"  OnClick="JavaScript:form1.dfrom.value = ' ';" /></a></div></th>
              </tr>
              <tr>
                <th><span class="f_nor">ถึงวันที่</span></th>
                <th height="43">
                  
                  <div align="left">
                    <input name="dto" id="dto" size="15" />
                  <a href="javascript:displayDatePicker('dto')"> <img border="0" src="pic/formcal.gif" width="16" height="16"  onclick="JavaScript:form1.dto.value = ' ';"></a></div></th>
              </tr>
              <tr >
                <th>เลือกสิทธิ</th>
                <th height="43" ><div align="center">
                    <select name="slHos" class="f_nor" id="slHos">
                      <option value=" ">-- เลือก --</option>
                      <?
$around=1;
while($objResult = oci_fetch_array($objParse,OCI_BOTH))
	{
?>
                      <option value="<?=$objResult['IDD'];?>">
                      <?=$objResult['IDN'];?>
                      </option>
                      <?
			   $around=$around+1;
}
?>