php 分頁顯示資料 post參數傳遞問題解決方案

今日php實現顯示資料分頁，竟遇到類似如下問題Notice: Undefined index: content in D:\Apache2.2\htdocs\pagefenye.php on line 18琢磨半天，終得解決。問題原因：因有post參數，點擊諸如“下一頁”等時，參數傳遞己變為get，而非post。解決方案：step1  使用$_REQUEST代替$_POST，$_REQUEST既可用於POST方法傳遞來的參數                             也可用於GET方法傳遞的參數                  step2  對form的post參數在換頁時要重新傳遞例子：form:

<form method="post" action="searchresult.php"><table class="core" style="text-indent: 2em;"><tbody>

      <tr>        <td>          <p><input type="radio" name="extent" value="category">By category.            <select style="font-family:Tahoma; font-size:12px; width:250px;" name="ca                                                                                                                                               tegory">              <option value="Aero Animal">Aero Animal</option>              <option value="Aero Fungi">Aero Fungi</option>              <option value="Aero Insect">Aero Insect</option>              <option value="Aero Mite">Aero Mite</option>              <option value="Aero Plant">Aero Plant</option>              <option value="Contact">Contact</option>              <option value="Food Animal">Food Animal</option>              <option value="Food Fungi">Food Fungi</option>              <option value="Food Plant">Food Plant</option>              <option value="Gliadin">Gliadin</option>              <option value="Protozoan">Protozoan</option>              <option value="Venom/Salivary">Venom/Salivary</option>              <option value="Worm">Worm</option>            </select>          </p>          <p><input type="radio" name="extent" value="species">By species.            <select style="font-family:Tahoma; font-size:12px; width:250px;" name="sp                                                                                                                                                  ecies">                                  <option value="other">Other</option>              <option value="Actinidia">Actinidia</option>              <option value="Alternata">Alternata</option>              <option value="Anisakis simplex">Anisakis simplex</option>              <option value="Aspergillus">Aspergillus</option>                                  <option value="maize">Maize</option>              <option value="Actinidia">Actinidia</option>              <option value="Alternata">Alternata</option>              <option value="Anisakis simplex">Anisakis simplex</option>              <option value="Aspergillus">Aspergillus</option>                                  <option value="Buckwheat">Buckwheat</option>              <option value="Carpinus">Carpinus</option>              <option value="cattle">Cattle</option>              <option value="Cedar">Cedar</option>              <option value="Chironomus">Chironomus</option>                                  <option value="Cockroach">Cockroach</option>              <option value="Grass">Grass</option>              <option value="Hazelnut">Hazelnut</option>              <option value="Hevea brasiliensis">Hevea brasiliensis</option>              <option value="Maize">Maize</option>                                  <option value="Malus">Malus</option>              <option value="Mite">Mite</option>              <option value="Olive">Olive</option>              <option value="Peanut">Peanut</option>              <option value="Pendula">Pendula</option>                                  <option value="Potato">Potato</option>                                  <option value="Roundworm">Roundworm</option>                                  <option value="Soybean">Soybean</option>              <option value="Tomato">Tomato</option>              <option value="Tropicalis">Tropicalis</option>              <option value="Wheat">Wheat</option>            </select>          </p>          <p><input type="radio" name="extent" value="all" checked="checked">List                                                                                                                                                    all.</p>        </td>      </tr>      <tr>        <td>          <input name="B1" type="submit" value="Search" />                              <input name="B2" type="reset" value="Reset" />                              <input name="absolutepage" type="hidden" value=""/>        </td>      </tr>        </tbody>      </table>     </form>searchresult.php部分代碼：注意藍色標出部分       <?php                                     $data=$_REQUEST['extent'];                                     $data1=$data;                                     $absolutepage=0;                                     $data2="";                                     $data3="";                                     //echo $data;                                     if ($data=="category"){                                       $data=$_REQUEST['category'];                                       $data2=$data;                                       $db=mysql_connect("localhost","root");                                       mysql_select_db("test",$db);                                       $result=mysql_query("select * from allergendata where Category='$data'",                                                                                                                                                            $db);                                       $pagesize=10;                                       $totalNum=mysql_num_rows($result);                                       $pageCount=(int)(($totalNum-1)/$pagesize)+1;                                                                              $absolutepage=$_REQUEST['absolutepage'];                                                                              (!$absolutepage)?($absolutepage=1):$absolutepage;                                       ($absolutepage<=$pageCount)?$absolutepage:($absolutepage=                                                                                                                                         $pageCount);                                       $f_pageNum=$pagesize*($absolutepage-1);                                       $result=mysql_query("select *from allergendata where Category='$data'                                                                                                     limit $f_pageNum,$pagesize",$db);                                       $i=$f_pageNum+1;                                       //echo $data;                                     }elseif($data=="species"){                                         $data=$_REQUEST['species'];                                         $data3=$data;                                         $db=mysql_connect("localhost","root");                                         mysql_select_db("test",$db);                                         $result=mysql_query("select * from allergendata where Species=                                                                                                                                     '$data'",$db);                                         $pagesize=10;                                         $totalNum=mysql_num_rows($result);                                         $pageCount=(int)(($totalNum-1)/$pagesize)+1;                                           $absolutepage=$_REQUEST['absolutepage'];                                         (!$absolutepage)?($absolutepage=1):$absolutepage;                                         ($absolutepage<=$pageCount)?$absolutepage:($absolutepage=                                                                                                                                         $pageCount);                                         $f_pageNum=$pagesize*($absolutepage-1);                                         $result=mysql_query("select *from allergendata where Species='$data'                                                                                                   limit  $f_pageNum,$pagesize",$db);                                         $i=$f_pageNum+1;                                         //echo $data;                                     }else{                                         $db=mysql_connect("localhost","root");                                         mysql_select_db("test",$db);                                         $result=mysql_query("select * from allergendata",$db);                                         $pagesize=10;                                         $totalNum=mysql_num_rows($result);                                         $pageCount=(int)(($totalNum-1)/$pagesize)+1;                                           $absolutepage=$_REQUEST['absolutepage'];                                         (!$absolutepage)?($absolutepage=1):$absolutepage;                                         ($absolutepage<=$pageCount)?$absolutepage:($absolutepage=                                                                                                                                          $pageCount);                                         $f_pageNum=$pagesize*($absolutepage-1);                                         $result=mysql_query("select *from allergendata limit $f_pageNum,                                                                                                                                      $pagesize",$db);                                         $i=$f_pageNum+1;                                     }                                     echo "<table boder=1 cellspacing=0 cellpadding=15>\n";                                     echo "<tr align='center'><td>Total records:</td><td>$totalNum</td>                                                                                                                                                        </tr>";                                     echo "</table>\n";                                     echo "<table boder=1 cellspacing=0 cellpadding=15>\n";                                     echo "<tr align='center' bgcolor=gray><td>No.</td><td>Name</td>                                                <td>UniPro Acc</td><td>Taxonomic Name</td>                                                <td>Common Name</td><td>Category</td>                                                <td>Species</td><td>Epitope</td><td>Sugar</td>                                                <td>Description</td></tr>\n";                                     //$i=1;                                     while($myrow=mysql_fetch_row($result)){                                       //echo $myrow[10];                                       printf("<tr align='center'><td>%d</td><td><a href='$myrow[10]'                                                                                                    target=_blank>%s</a></td>                                                  <td>%s</td><td>%s</td><td>%s</td><td>%s</td><td>%s</td>                                                                                                                                  <td>%s</td>                                                  <td>%s</td><td>%s</td></tr>\n",$i,$myrow[1],$myrow[2],                                                         $myrow[3],$myrow[4] ,$myrow[5],$myrow[6],$myrow[7],                                                         $myrow[8],$myrow[9]);                                       $i++;                                     }                                     $p=($absolutepage>1)?($absolutepage-1):1;                                     //echo $p;                                     $q=($absolutepage<=($pageCount-1))?($absolutepage+1):$absolutepage;                                     //echo $q;                                     echo "<tr><td>Records:</td><td>$totalNum</td><td>Page:</td>                                                 <td>$absolutepage/$pageCount</td>                                                <td><a href='?extent=$data1&category=$data2&species=                                                                                    $data3&absolutepage=$p'> previous</a></td>                                                <td><a href='?extent=$data1&category=$data2&species=                                                                                       $data3&absolutepage=$q'>next</a>                                                 </td></tr>";                                     mysql_free_result($result);                                     mysql_close($db);                                     echo "</table>\n";                                   ?>