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need little help php while loop condition

Revil_Wevil

By Revil_Wevil
in PHP Coding Help

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Revil_Wevil Newbie

Revil_Wevil

Posted
Posted

i have been working on minor project this is login script of that page i am facing some problem i want to echo if user name password and category both 3 conditions dont match with error "wrong username/password" in form i have tried everything as per my knowledge please help me in this i am new to php so dont have much experience and knowledge of php

<?php
$msg='';
    $con=mysql_connect('localhost','root','');
    if(!$con)
    {
        die("Error While connecting.......");
    }
    else
    {
        mysql_select_db("sms",$con);
        if(isset($_POST['btnlog']))
        {
            $res=mysql_query("select * from tbl_login where un='".$_POST['username']."' and pw='".$_POST['password']."' and cat='".$_POST['cat']."'");
            while($r=mysql_fetch_array($res))
            
            {
                    mail("notification@receiver.com".$_POST['username']."Successfully Logged In"."From:notification@sender.com");
                    if($r['cat']=="admin")                            
                    header("Location:admin/admin.php");                                                                                                    
                    elseif($r['cat']=="faculty")
                    header("Location:faculty/faculty.php");

                    else $msg="Incorrect Username/Password";
                    
                    
            }
            
        }
    }
?>

<body>
<section class="login_container">
    <div class="login_box">
      <h1>Login</h1>
      <form method="post">
      <center><?php echo $msg; ?></center>
        <p><input type="text" name="username" value="" placeholder="Username"></p>
        <p><input type="password" name="password" value="" placeholder="Password"></p>
          <center><select class="select" name="cat">Category
              <option selected="selected">Select A Category</option>
            <option value="admin">Administrator</option>
            <option value="faculty">Faculty</option>
          </select></center>
        <p class="submit"><input type="submit" name="btnlog" value="Login">
                          <input type="reset" value="Clear" /></p>
      </form>
    </div>
  </section>

davidannis Regular Member

davidannis

Posted
Posted (edited)

Not sure what this is doing wrong but...

 

A few suggestions:

 

You need a space after Location: in the header()

 

Use mysqli instead of mysql

 

sanitize your data to prevent SQL injection attacks $password=mysqli_real_escpe_string($con, $_POST['password'])

 

salt and hash your passwords so they are not stored in the clear.

 

when posting here put code in code tags (the <> symbol in the editor)

Edited by davidannis
Matt_C Newbie

Matt_C

Posted
Posted

Hey, you have a lot of problems in your code, spend a little time and go check out some resources on what you are trying to do. http://w3schools.com/php/ has all the basics and more. Doing this will help you quicker than we can and you will become a better developer over all.

 

Try setting out your connections and queries better, get into some good habits.

 <?php
    define("DB_SERVER", "server");
    define("DB_USER", "username");
    define("DB_PASS", "password");
    define("DB_NAME", "database_name");


  $connection = mysqli_connect(DB_SERVER, DB_USER, DB_PASS, DB_NAME);
  
if(mysqli_connect_errno()) {
    die("Database connection failed: " .
         mysqli_connect_error() .
         " (" . mysqli_connect_errno() . ")"
    );
  }
    
        // set queries up like this
            $query  = "SELECT * ";
            $query .= "FROM table_name ";
            $query .= "ORDER BY value ASC";
            
            // query the database
            $data_set = mysqli_query($connection, $query);
            confirm_query($data_set);
        
        // use the results
        while($upload = mysqli_fetch_assoc($data_set)) {
            // do something here
        }
    
    function confirm_query($result_set) {
        if (!$result_set) {
            die("Database query failed.");
        }
    }
    ?>

I could also achieve the same with oop and set up a class and some class methods for crud.

class DatabaseObject {

    public static function find_all() {
        return static::find_by_sql("SELECT * FROM ".static::$table_name);
  }
 
  public static function find_by_id($id=0) {
      global $database;
    $result_array = static::find_by_sql("SELECT * FROM ".static::$table_name." WHERE id=".$database->escape_value($id)." LIMIT 1");
        return !empty($result_array) ? array_shift($result_array) : false;
  }
 
  public static function find_by_sql($sql="") {
    global $database;
    $result_set = $database->query($sql);
    $object_array = array();
    while ($row = $database->fetch_array($result_set)) {
      $object_array[] = static::instantiate($row);
    }
    return $object_array;
  }

    public static function count_all() {
      global $database;
      $sql = "SELECT COUNT(*) FROM ".static::$table_name;
      $result_set = $database->query($sql);
      $row = $database->fetch_array($result_set);
          return array_shift($row);
      }

    private static function instantiate($record) {
        // Could check that $record exists and is an array
        $class_name = get_called_class();
        $object = new $class_name;
        foreach($record as $attribute=>$value){
          if($object->has_attribute($attribute)) {
            $object->$attribute = $value;
          }
        }
        return $object;
    }
    
    private function has_attribute($attribute) {
      // We don't care about the value, we just want to know if the key exists
      // Will return true or false
      return array_key_exists($attribute, $this->attributes());
    }

    protected function attributes() {
        // return an array of attribute names and their values
      $attributes = array();
      foreach(static::$db_fields as $field) {
        if(property_exists($this, $field)) {
          $attributes[$field] = $this->$field;
        }
      }
      return $attributes;
    }
    
    public function save() {
      // A new record won't have an id yet.
      return isset($this->id) ? $this->update() : $this->create();
    }
    
    protected function sanitized_attributes() {
      global $database;
      $clean_attributes = array();
      // sanitize the values before submitting
      // Note: does not alter the actual value of each attribute
      foreach($this->attributes() as $key => $value){
        $clean_attributes[$key] = $database->escape_value($value);
      }
      return $clean_attributes;
    }
    
    
    public function create() {
        global $database;
        $attributes = $this->sanitized_attributes();
      $sql = "INSERT INTO ".static::$table_name." (";
        $sql .= join(", ", array_keys($attributes));
      $sql .= ") VALUES ('";
        $sql .= join("', '", array_values($attributes));
        $sql .= "')";
      if($database->query($sql)) {
        $this->id = $database->insert_id();
        return true;
      } else {
        return false;
      }
    }

    public function update() {
      global $database;
        $attributes = $this->sanitized_attributes();
        $attribute_pairs = array();
        foreach($attributes as $key => $value) {
          $attribute_pairs[] = "{$key}='{$value}'";
        }
        $sql = "UPDATE ".static::$table_name." SET ";
        $sql .= join(", ", $attribute_pairs);
        $sql .= " WHERE id=". $database->escape_value($this->id);
      $database->query($sql);
      return ($database->affected_rows() == 1) ? true : false;
    }

    public function delete() {
        global $database;
      $sql = "DELETE FROM ".static::$table_name;
      $sql .= " WHERE id=". $database->escape_value($this->id);
      $sql .= " LIMIT 1";
      $database->query($sql);
      return ($database->affected_rows() == 1) ? true : false;

    }
    
}
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