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<?php session_start(); $username=$_POST['username']; $password=$_POST['password']; if($username&&$password) { mysqli_select_db("user",$myconnection) or die("couldn't find db"); $sqlcommand="SELECT * FROM users where username='$username'"; $query= mysqli_query($myconnection,$sqlcommand); $numrows= mysqli_num_rows($query); if($numrows!==0) { while($row= mysqli_fetch_assoc($query)) { $dbusername=$row['username']; $dbpassword=$row['password']; } if($username==$dbusername&&md5($password)==$dbpassword) { echo "you are logged in!"; $_SESSION['username']=$username; } else echo"your password is incorrect!"; } else die("that user doesn't exits"); } …
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<?php session_start(); $username=$_POST['username']; $password=$_POST['password']; if($username&&$password) { mysqli_select_db("user",$myconnection) or die("couldn't find db"); $sqlcommand="SELECT * FROM users where username='$username'"; $query= mysqli_query($myconnection,$sqlcommand); $numrows= mysqli_num_rows($query); if($numrows!==0) { while($row= mysqli_fetch_assoc($query)) { $dbusername=$row['username']; $dbpassword=$row['password']; } if($username==$dbusername&&md5($password)==$dbpassword) { echo "you are logged in!"; $_SESSION['username']=$username; } else echo"your password is incorrect!"; } else die("that user doesn't exits"); } … 
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