Php problem

Hi ,I got a problem , I try to input the username and password into database,but I got those problem


( ! ) Notice: Undefined variable: register in D:\PHPlearn\Assignment3\index.php on line 68

( ! ) Notice: Undefined index: in D:\PHPlearn\Assignment3\index.php on line 68


<input type="submit" name="login" value="Login">
<input type="submit" name="register" value="register">
<?php


if($_POST["$register"]!="")
{

mysql_select_db("assignment3" , $connect);
mysql_query("INSERT INTO ass3_info (name,password)
VALUES ('".$username."','".$pwd."')");

mysql_close($connect);
}

?>

Firslty, when accessing post variables, you do not use $ in the variable name

PHP Code:

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$_POST["$register"] 


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Should be

PHP Code:

---

$_POST["register"] 


---

I would also change your if statement to this

PHP Code:

---

if(isset($_POST['register']) && !empty($_POST['register']) { 


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I don't know what your second error means as it doesn't give the name of the undefined index.

The second error is caused by the first. PHP doesn't find a definition for a $register variable, so it gives an error and evaluates it to NULL. It then tries to evaluate $_POST[NULL] and throws the second error.