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PO$_POST not working. "Notice: Undefined index: username..."
 

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  1. PO$_POST not working. "Notice: Undefined index: username..."
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/4261133/php-notice-undefined-variable-and-notice-undefined-index">PHP: “Notice: Undefined variable” and “Notice: Undefined index”</a> </p> </blockquote> <p>So, I am currently learning PHP and was reading on a book about the md5 function for passwords, so I decided to give it a try and see how it goes. I also decided to use the POST method rather than the GET, since I saw people saying that it is safer and doesn't let the variables appearing on the URL.</p> <p>For my testing project I made a very simple form, which follows:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form action="dologin" method="POST"&gt; &lt;table border="0"&gt; &lt;tbody&gt; &lt;tr&gt; &lt;td&gt;Username:&lt;/td&gt; &lt;td&gt;&lt;input type="text" name="username"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Password:&lt;/td&gt; &lt;td&gt;&lt;input type="password" name="password"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt; &lt;input type="submit" value="Login"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The problem is that when I enter the values on BOTH fields and click "Login" I get the following output on the other PHP file.</p> <pre><code>Notice: Undefined index: username in C:\xampp\htdocs\md5\home\dologin\index.php on line 11 Username non existent </code></pre> <p>Here follows the code for the "/dologin/index.php" file</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;?php mysql_connect("localhost", "root") or die(mysql_error()); mysql_select_db("test") or die(mysql_error()); $query = "SELECT password FROM users WHERE username='".$_POST['username']."'"; $result = mysql_query($query); $row = mysql_num_rows($result); if(isset($row)){ $password = (mysql_result($result,$row - 1)); $enteredpassword = md5("w@#$@#".$_GET['password']."^#3f%#^"); if($password == $enteredpassword){ if(!isset($_COOKIE['PHPSESSID'])){ session_start(); } $_SERVER['LOGIN_STATUS'] = true; } else { die("Access denied"); } } else { die("Username non existent"); } ?&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Any help at all on my issue is very much appreciated, thank you for reading.</p>
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    1. COSeems more likely you would get an undefined index notice on `$_GET['password']` since this form was sent as a POST.
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      1. USMichael Berkowski
    2. COBefore you continue with this project, [start reading about SQL injection](http://stackoverflow.com/questions/60174/how-to-prevent-sql-injection-in-php) and the use of prepared statements. The old `mysql_*()` functions will be deprecated in the next major PHP release, and you are advised to switch to a newer API like PDO or MySQLi.
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      1. USMichael Berkowski
    3. COpssstt: At the top of the your logic (index.php) file, throw this in there: var_dump($_POST); That will allow you to see what you're passing from page to page.
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      1. USJosh Brody
 

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