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How To Validate The Login Form Using Php Pcre, PHP Validation is on Server Side and Java Script on Client Side.
veerumits
post Oct 23 2008, 09:40 PM
Post #1


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Group: Members
Posts: 38
Joined: 23-October 08
From: India
Member No.: 34,049
myCENTs:27.89
I am Design a Sample Login form Using This Code :

CODE
<?php if(!isset($_POST["OK"]))
{
if(empty($_POST["fname"]))
{
$fnmerror='Invalid First Name';
}
elseif(empty($_POST["lname"]))
{
$lnmerror='Invalid Last Name';
}
elseif(empty($_POST["age"]))
{
$ageerror='Invalid Age';
}
elseif(empty($_POST["city"]))
{
$cityerror='Invalid City';
}
elseif(empty($_POST["pin"]))
{
$pinerror='Invalid Pin No.';
}
elseif(empty($_POST["mob"]))
{
$moberror='Invalid Mobile No.';
}
elseif(empty($_POST["email"]))
{
$emailerror='Invalid Email address';
}
else
{
$result =" Thanks submitting your Information";
}
}
?>
<body bgcolor="#99CC66" text="#663333" link="#FFFF00" alink="#996666" vlink="#FF6666">
<center>
  <form action="Student.php" method="post">
    <H1><font color="#800000">Please Fill The Following information :</font></H1>
    <font color="#800000"><br>
    </font>
    <TABLE BORDER="" BGCOLOR="yellow" width="448" height="293">
        <TD height="2" width="86">
      <TR>
        <TD width="86" height="35"><font size="+1" color="#800000">First Name</font></TD>
        <TD width="41" height="35"><font color="#800000">:</font></TD>
        <TD width="299" height="35"> <font color="#800000">
          <input type="text" name="fname" value="<?php echo $_POST["fname"]; ?>"/>
          <b>
          <?php echo '<font color="RED">'.$fnmerror.'</font>'; ?>
          </b> </font></TD>
      </TR>
      <TR>
        <TD width="86"><font size="+1" color="#800000">Last Name</font></TD>
        <TD width="41"><font color="#800000">:</font></TD>
        <TD width="299"> <font color="#800000">
          <input type="text" name="lname" value="<?php echo $_POST["lname"]; ?>" />
          <b>
          <?php echo '<font color="RED">'.$lnmerror.'</font>'; ?>
          </b> </font></TD>
      </TR>
      <TR>
        <TD width="86"><font size="+1" color="#800000">Age</font></TD>
        <TD width="41"><font color="#800000">:</font></TD>
        <TD width="299"> <font color="#800000">
          <input type="text" name="age" value="<?php echo $_POST["age"]; ?>" />
          <b>
          <?php echo '<font color="RED">'.$ageerror.'</font>'; ?>
          </b> </font></TD>
      </TR>
      <TR>
        <TD width="86"><font size="+1" color="#800000">City</font></TD>
        <TD width="41"><font color="#800000">:</font></TD>
        <TD width="299"> <font color="#800000">
          <input type="text" name="city" value="<?php echo $_POST["city"]; ?>" />
          <b>
          <?php echo '<font color="RED">'.$cityerror.'</font>'; ?>
          </b> </font></TD>
      </TR>
      <TR>
        <TD width="86"><font size="+1" color="#800000">Pin No.</font></TD>
        <TD width="41"><font color="#800000">:</font></TD>
        <TD width="299"> <font color="#800000">
          <input type="text" name="pin" value="<?php echo $_POST["pin"]; ?>" />
          <b>
          <?php echo '<font color="RED">'.$pinerror.'</font>'; ?>
          </b> </font></TD>
      </TR>
      <TR>
        <TD width="86"><font size="+1" color="#800000">Mobile</font></TD>
        <TD width="41"><font color="#800000">:</font></TD>
        <TD width="299"> <font color="#800000">
          <input type="text" name="mob" value="<?php echo $_POST["mob"]; ?>" />
          <b>
          <?php echo '<font color="RED">'.$moberror.'</font>'; ?>
          </b> </font></TD>
      </TR>
      <TR>
        <TD height="28" width="86"><font size="+1" color="#800000">Email</font></TD>
        <TD height="28" width="41"><font color="#800000">:</font></TD>
        <TD height="28" width="299"> <font color="#800000">
          <input type="text" name="email" value="<?php echo $_POST["email"]; ?>" />
          <b>
          <?php echo '<font color="RED">'.$emailerror.'</font>'; ?>
          </b> </font></TD>
      </TR>
      <TR SIZE="100">
        <TD colspan="3" height="7"><font color="#800000"> <b>
          <input type="Button" size="40" name="result" value =" <?php echo $result; ?> " />
          </b> </font></TD>
      </TR>
      <TR>
        <TD width="86" height="3"><font color="#800000">.</font></TD>
        <TD width="41" height="3"> <font color="#800000">
          <input type="Submit" value="OK" />
          </font></TD>
        <TD width="299" height="3"><font color="#800000">.</font></TD>
      </TR>
    </TABLE>
  </form>
</center>


When i brows on Server i see This
here i am not able to show you exactly but just like this

Please Fill The Following information :


First Name : Invalid First Name
Last Name :
Age :
City :
Pin No. :
Mobile :
Email :

(OK)




Conclusion:

In starting Invalid First Name even i am not hitting on OK button but when i hit it is fine i want that it come only when i hit on ok button and field are blank.
any one correct this problem what is right code for this

i think that in this code have error

<?php
if(!isset($_POST["OK"]))
{

}
?>



but i am get resolve after so many try.
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