Form Validation : Showing errors without passing inputs

ankur0101 · December 7, 2011

Hello,

I am doing a php registration form, file name is register.php

<?php
include("config.php");

$submit = strip_tags($_POST['submit']);
$username = strip_tags($_POST['user_box']);
$password = md5(strip_tags($_POST['pass_box']));
$cpassword = md5(strip_tags($_POST['c_pass_box']));
$email = strip_tags($_POST['email_box']);
$mobile = $_POST['mobile_box'];
$ip = $_SERVER['REMOTE_ADDR'];
$date = date('Y-m-d');
$time = date('h-i-s');
$i = 0;

$checkusername = mysql_num_rows(mysql_query("SELECT * FROM members WHERE username='$username'"));
$checkemail = mysql_num_rows(mysql_query("SELECT * FROM members WHERE email='$email'"));

/* Validating username field */
if($username != NULL)
{
    if (strlen($username) > 15 || strlen($username) < 6)
        {
            echo "<p>Username must be in range of 6 to 15 Characters.</p>";
            }
    else
    {
        //check in DB
        if ($checkusername == 1)
        {
            echo "<p>Username already exist in database.</p>";            
            }
        else
        {
            $i++;
            }
        }
    }
else
{
    echo "<p>Username cannot be Blank</p>";
    }

/* ----------validating password field---------- */
if ($password != "d41d8cd98f00b204e9800998ecf8427e" || $cpassword != "d41d8cd98f00b204e9800998ecf8427e")
{
    if ($password == $cpassword)
    {
        if (strlen($password) > 16 && strlen($password) < 4)
        {
            echo "<p>password must be in range of 4 to 16 Characters.</p>";
        }
        else
        {
            $i++;
            }

    }
    else
    {
    echo "<p>Passwords do not match.</p>";
    }
}
else
{
    echo "<p>Password cannot be empty</p>";
    }
/* ----------Validating Passwords End---------- */

/* ----------Validating Email field Starts---------- */
if($email != NULL)
{
    if($checkemail == 1)
    {
        echo "<p>Email already exist.</p>";
        }
    else
    {
        $i++;
        }
    }
else
{
    echo "<p>Email field cannot be empty.</p>";
    }
/* ----------Validating Email fiend ends---------- */

/* ----------Validating Email field Starts---------- */
if($mobile != NULL)
{
    if(strlen($mobile) >10)
    {
        echo "<p>Mobile cannot be more than 10 digits long</p>";
        }
    else
    {
        $i++;
        }
    }
else
{
    echo "<p>Mobile field cannot be empty.</p>";
    }
/* ----------Validating Email fiend ends---------- */

if ($i == 4)
{
mysql_query("INSERT INTO members (username, password, email, mobile, ip, date, time) VALUES ('$username', '$cpassword', '$email', '$mobile', '$ip', '$date', '$time')");
echo "<p>Successful Registration Done !</p>";
}


?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
<form id="form1" name="form1" method="post" action="">
  <table width="576" height="229" border="0">
    <tr>
      <td width="139">Username :</td>
      <td colspan="2"><label for="user_box"></label>
      <input type="text" name="user_box" id="user_box" size="30" height="30" />
      (Between 6 to 15 Characters)</td>
    </tr>
    <tr>
      <td>Password :</td>
      <td colspan="2"><label for="pass_box"></label>
      <input type="password" name="pass_box" id="pass_box" size="30" height="30" /> 
      (Between 4 to 16 Characters)</td>
    </tr>
    <tr>
      <td>Confirm Password :</td>
      <td colspan="2"><label for="c_pass_box"></label>
      <input type="password" name="c_pass_box" id="c_pass_box" size="30" height="30" /></td>
    </tr>
    <tr>
      <td>Email Address :</td>
      <td colspan="2"><label for="email_box"></label>
      <input type="text" name="email_box" id="email_box" size="30" height="30" /></td>
    </tr>
    <tr>
      <td>Mobile No. :</td>
      <td colspan="2"><label for="mobile_box"></label>
      <input type="text" name="mobile_box" id="mobile_box" size="30" height="30" /> 
      (10 Characters)</td>
    </tr>
    <tr>
      <td> </td>
      <td width="171"><input type="submit" name="submit" id="submit" value="Submit" /></td>
      <td width="252"><input type="reset" name="button2" id="button2" value="Reset" /></td>
    </tr>
  </table>
</form>
</body>
</html>

When I load page, it shows following errors before

Username cannot be Blank

Password cannot be empty

Email field cannot be empty.

Mobile field cannot be empty.

What I want is on loading page i.e. before giving any inputs, it should not show any errors.

Need help

btellez · December 7, 2011

As an example:

When you load the page $username will equal '' (empty string)

with your logic, $username != null, so the else is executed, ''

/* Validating username field */
if($username != NULL)
{
    /* Bunch of stuff in here*/
}
else
{
    echo "<p>Username cannot be Blank</p>";
}

I think what you want is something like:

/* Validating username field */
if (isset($_POST['submit'])){ // only execute inside if the form was submitted
if ($username != NULL)
{
    /* Bunch of stuff in here*/
}
else
{
    echo "<p>Username cannot be Blank</p>";
}

/* Remaining form validation logic here...*/
}

SergeiSS · December 7, 2011

$username = strip_tags($_POST['user_box']);

It's better to change it:

$username=isset( $_POST['user_box']) ? strip_tags($_POST['user_box']) : null;

And later you can check as you did it before:

if($username != NULL) ...
// or just 
if( $username ) ...

offtopic: how can I highlight the PHP code here?

ankur0101 · December 7, 2011

Hi,

The following method worked

/* Validating username field */
if (isset($_POST['submit'])){ // only execute inside if the form was submitted
if ($username != NULL)
{
    /* Bunch of stuff in here*/
}
else
{
    echo "<p>Username cannot be Blank</p>";
}

/* Remaining form validation logic here...*/
}

tomfmason · December 7, 2011

offtopic: how can I highlight the PHP code here?

php code within

will automatically be highlighted if you start with <?php. Otherwise you can use

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Form Validation : Showing errors without passing inputs

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