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POSession Handling in PHP 5
 

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    <p>i've a problem with php session handling that i can't explain to myself. I'm studying php from scratch, and i can't figure out how to mantain a session live:</p> <p>This is my index page, where a user can login or register to the database visiting the right page, and then come back to see if he's logged in:</p> <p>Code:</p> <pre><code>Index &lt;?php session_start(); ?&gt; &lt;a href="register.php" target="_self"&gt; Register &lt;/a&gt; &lt;a href="login.php" target="_self"&gt; Login &lt;/a&gt; &lt;?php if(isset($_SESSION['login'])) { echo "Logged as: ".$_SESSION['nlogin']; ?&gt; &lt;form method="post" action="&lt;?php unset($_SESSION['login']) ?&gt;"&gt; &lt;input type="button" name="logOut" value="LogOut" /&gt; &lt;/form&gt; &lt;?php } else { echo "Please Register or Login"; } ?&gt; </code></pre> <p>In fact this work, because when i come back from login.php it says, "Logged as: Admin"</p> <p>But when i click on the link to get the login page, or register page again from the index page, i should get the same message, "Logged as...", but the session appear to be closed instead. :(</p> <p>here's login.php:</p> <pre><code>&lt;?php session_start(); include "dbConnect.php"; if(isset($_SESSION['login'])) { echo "Logged as: ".$_SESSION['nlogin']; // IT NEVER SHOW THIS MESSAGE } if(isset($_POST['submit']) &amp;&amp;(trim($_POST['submit']) == "Login")) { if(!isset($_POST['user']) || $_POST['user']=="") { echo "Attenzione inserire l'username."; } elseif(!isset($_POST['pwd'])||$_POST['pwd']=="") { echo "Attenzione inserire la password."; } else { $u = trim(filter_var($_POST['user'], FILTER_SANITIZE_STRING)); $u = str_replace(" ","_",$u); $p = trim(filter_var($_POST['pwd'], FILTER_SANITIZE_STRING)); $p = sha1($p); $istance = new dbHandle; $istance-&gt;connect(); $data = $istance-&gt;query("SELECT * FROM login WHERE username_login = '$u' AND password_login = '$p'"); if(mysql_num_rows($data) == 0) { echo "Failed"; echo "&lt;a href='index.php' target='_self'&gt; Go Back &lt;/a&gt;"; } else { echo "Logged"; $res = $istance-&gt;getdata($data); $_SESSION['login'] = $res-&gt;id_login; $_SESSION['nlogin'] = $res-&gt;username_login; echo "&lt;a href='index.php' target='_self'&gt; Go Back &lt;/a&gt;"; } } } else { ?&gt; Login &lt;form method="post" action="&lt;?php echo $_SERVER['PHP_SELF']; ?&gt;"&gt; ... &lt;input name="user" type="text" size="20" required="required"/&gt; ... &lt;input name="pwd" type="password" size="20" required="required"/&gt; ... &lt;input type="submit" name="submit" value="Login"/&gt; &lt;/form&gt; &lt;form method="post" action="&lt;?php unset($_SESSION['login']) ?&gt;"&gt; &lt;input type="button" name="logOut" value="LogOut" /&gt; &lt;/form&gt; &lt;?php } $istance-&gt;disconnect(); ?&gt; </code></pre> <p>When i come back using the link above "Go Back" to the index page, it shows Logged as... but when i come back here again, it does not.</p> <p>So i assume my session were destroyed automatically? but why?</p> <p>Thanks, i appreciate your help.</p> <p>I forget to say that PHP.ini has </p> <blockquote> <p>session.cookie_lifetime</p> </blockquote> <p>set to "0"</p> <p>Thanks</p>
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