mysql - validate values through database in PHP -


i trying figure out how validate submitted form values through database file located on local computer. database file contains 2 columns number , amount. both columns have value inside. possible select database file column using mysql select statement , validate submitted value form? if value exists in database files, display form. if doesn't exist, want display error message.

here code,

    <?php     $displayform = true;     if(isset($_post['check'])){         $taxinvoice = $_post["taxinvoice"];         $amount = $_post["amount"];         $displayform = false;           $db = dbase_open('c:\users\richmond\desktop\ctp.dbf',0);         ($i = 1; $i < dbase_numrecords($db);$i++) {         $row = dbase_get_record_with_names($db, $i);              if (($row['number'] == $taxinvoice) && ($row['amount'] == $amount))             {             ?>                   <form method="post" action="<?php echo $_post['action']; ?>">                     <input name="auth_user" type="hidden">                     <input name="auth_pass" type="hidden">                     <input name="redirurl" type="hidden" value="<?php echo $_post['redirurl']; ?>">                     <input name="accept" type="submit" value="continue">                 </form>             <?php             }             else             {             ?>              <?php             }         }     }      if($displayform)     {     ?>         <form method="post" action="">             <label>tax invoice:</label><br>             <input type="text" name="taxinvoice"><br>             <label>amount:</label><br>             <input type="text" name="amount"><br>             <input type="submit" name="check" value="check">         </form>     <?php     } ?>


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