php - im lost with validating my code -


can me validate codes? user should able input numeric or integer only. have tried using ctype_digit isnumeric , more else , because didnt quite understand on how use nothing successful 

<?php     $table = '';      if ($_post) {         $table .= '<table border="4">';         ($i = 0; $i < $_post['rows']; $i++) {             $table .= '<tr>';             ($j = 0; $j < $_post['column']; $j++) {                 $table .= '<td width="100">&nbsp;</td>';             }             $table .= '</tr>';         }         $table .= '</table>';     }  ?>  <?php echo "a table "; echo $_post['rows']; echo " row(s) , "; echo  $_post['column']; echo " column(s) " ;?>  <?php     echo $table;  ?>                <form action="" method="post">         <table border="0" width="729">             <tr>                 <td width="39"><label>rows :</label></td>                 <td width="144"><input type="text" name="rows"></td>                  <td width="51" ><label>column :</label></td>                 <td width="352" ><input type="text" name="column"></td>             </tr>              <tr>                 <td colspan="2" align="center"><input type="submit" value="create table"></td>             </tr>         </table>          </form>     <br />     <br />

by way form should validate using php . thank in advance !!

thank guys , sorry inconvenience complete code .

<?php     $table = '';     $row= $_post['rows'];     $column=$_post['column'];     if (isset ($_post['submit'])){         if($row=="")         $error= "error : please fill out row";          else if($column=="")         $error= "error : please fill out column";          elseif(is_numeric($row)==false)         $error= "error number only";          elseif(is_numeric($column)==false)         $error= "error number only";          else         {          $table .= '<table border="4">';         ($i = 0; $i < $_post['rows']; $i++) {             $table .= '<tr>';             ($j = 0; $j < $_post['column']; $j++) {                 $table .= '<td width="100">&nbsp;</td>';             }             $table .= '</tr>';         }         $table .= '</table>';   echo "a table "; echo $row; echo " row(s) , "; echo  $column; echo " column(s) " ;      echo $table;      }     } ?>     <?php      if (isset($error))     {         echo "<font color='ff0000'><center><b>". $error .         "</b></center></font>";     }     ?>               <form action="" method="post" >         <table border="0" width="729">             <tr>                 <td width="39"><label>rows :</label></td>                 <td width="144"><input type="text" name="rows"></td>                  <td width="51" ><label>column :</label></td>                 <td width="352" ><input type="text" name="column"></td>             </tr>              <tr>                 <td colspan="2" align="center"><input type="submit" name="submit" value="create table"></td>             </tr>         </table>          </form>     <br />     <br />

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