php - update query not working and change fields to 0 -


i have form code.

<form action="save_profile.php" method="post">           <table>             <tr><td>first name:</td><td><input type="text" name="fname" value="<?php echo $fname;?>"></td></tr>             <tr><td>last name:</td><td><input type="text" name="lname" value="<?php echo $lname;?>"></td></tr>             <tr><td>mail id:</td><td><input type="text" name="mail" value="<?php echo $mail;?>"></td></tr>             <tr><td>contact no:</td><td><input type="text" name="contact" value="<?php echo $contact;?>"></td></tr>             <tr><td></td><td><input type="submit" name="submit" value="save profile"></td></tr>           </table>           </form>

and save_profile.php file has code.

<?php session_start(); require('config.php'); function is_valid_fname($fname,$lname,$contact) {  if (empty($fname)) {      ?>      <center><strong><font color="red">first name required.</font></strong></center>      <?php      return false;  }  if ( !preg_match ("/^[a-za-z\s]+$/",$fname)) {      ?>      <center><strong><font color="red">first name contain letters.</font></strong></center>      <?php      return false;  }   if (strlen($fname)>20) {      ?>      <center><strong><font color="red">first name must less 20 letters.</font></strong></center>      <?php      return false;  }  if (empty($lname)) {      ?>      <center><strong><font color="red">last name required.</font></strong></center>      <?php      return false;  }  if ( !preg_match ("/^[a-za-z\s]+$/",$lname)) {      ?>      <center><strong><font color="red">last name contain letters.</font></strong></center>      <?php      return false;  }   if (strlen($lname)>20) {      ?>      <center><strong><font color="red">last name must less 20 letters.</font></strong></center>      <?php      return false;  }  if (empty($contact)) {      ?>      <center><strong><font color="red">contact required.</font></strong></center>      <?php      return false;  }  if ( !preg_match ("/^[0-9\s]+$/",$contact)) {      ?>      <center><strong><font color="red">contact contain numbers.</font></strong></center>      <?php      return false;  }  if (strlen($contact)>15) {      ?>      <center><strong><font color="red">contact must less 20 digits.</font></strong></center>      <?php      return false;  }   else{   return true;  } } function is_valid_email($mail) {  if (empty($mail)) {      ?>      <center><strong><font color="red">email required.</font></strong></center>      <?php      return false;  } else {      $email = test_input($mail);      // check if e-mail address well-formed      if (!filter_var($mail, filter_validate_email)) {        ?>      <center><strong><font color="red">invalid email format.</font></strong></center>      <?php         return false;  }   // check if mail registered  $slquery = "select 1 user_tbl user_mail = '".$mail."'";  $selectresult = mysql_query($slquery);  if(mysql_num_rows($selectresult)>1) {    ?>      <center><strong><font color="red">this email exits.</font></strong></center>      <?php    return false;  }  // returns true- means can proceed mail  return true; } } if (isset($_post['submit'])){ $fname = $_post['fname']; $lname = $_post['lname']; $mail = $_post['mail']; $contact = $_post['contact']; function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } if (is_valid_email($mail) && is_valid_fname($fname,$lname,$contact)) {     $query="update user_tbl set user_fname='".$fname."' , user_lname='".$lname."' , user_mail='".$mail."' , user_contact='".$contact."' user_id='".$_session['uid']."'";      $result = mysql_query($query);      if ($result) {          header('location:profile.php');      } } else{       ?>      <center><strong><font color="red">error updating user.</font></strong></center>      <?php     } } ?>

my problem after displaying data in form when change form data , when submit form update user_fname=0...when change other field other fields remain same , set user_fname=0.please me...

please use comma(,) in stead of and

$query="update user_tbl set user_fname='".$fname."', user_lname='".$lname."', user_mail='".$mail."', user_contact='".$contact."' user_id='".$_session['uid']."'";

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