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POLocal variable overwrite session variable in PHP
 

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    <p>Hi I'm having some problem with a PHP page: I'm writing a little CMS using <a href="http://www.intranetjournal.com/articles/200407/ij_07_06_04a.html" rel="nofollow">this</a> tutorial. I manage to write a class I use to interact with menus and all is working well: I can insert, delete and get all items of the menu in a page where I can reorder them. When I started to write the same page for users, I encountered an issue: I'm using a Sentry class to validate users in each page: </p> <pre><code>require_once('../includes/Sentry.php'); $theSentry = new Sentry(); if (!$theSentry-&gt;checkLogin(1) ){ header("Location: index.php"); die(); } </code></pre> <p>Now: if I use this validation alone, the page is working well, but I need to query the database and extract all the user in the user_admin.php page:</p> <pre><code>require_once('../includes/DbUser.php'); $user_connector = new DbUser(); $all_users = array(); $all_users = $user_connector-&gt;getUserArray(); foreach($all_users as $id =&gt; $user){ echo " ... " }; </code></pre> <p>If I comment one of the two section, all is working well, but if I leave this code running together, the page is correctly created, but next time I run a page using the Sentry class, I'm redirected to login page with an error. The Sentry class use a Validator class to check credentials, and a method in this class is reporting an array input instead of a single value input.</p> <p>My question is: how can be possible that two different objects created from two different classes, can interact generating such a problem? I think you need the code of the two method:</p> <pre><code>class Sentry { ... function checkLogin($group=9,$user='',$pass='',$goodRedirect='',$badRedirect='') { // Include database and validation classes, and create objects require_once('DbConnector.php'); require_once('Validator.php'); $validate = new Validator(); $loginConnector = new DbConnector(); // If user is already logged in then check credentials if ($_SESSION['user'] &amp;&amp; $_SESSION['pass']){ // Validate session data if (!$validate-&gt;validateTextOnly($_SESSION['user'])){return false;} if (!$validate-&gt;validateTextOnly($_SESSION['pass'])){return false;} if ($_SESSION['gruppo'] &lt;= $group){ // Existing user ok, continue if ($goodRedirect != '') { header("Location: ".$goodRedirect) ; } return true; }else{ // Existing user not ok, logout //$this-&gt;logout(); header("Location: low_perm.php"); die; //return false; } // User isn't logged in, check credentials }else{ // Validate input if (!$validate-&gt;validateTextOnly($user)){return false;} if (!$validate-&gt;validateTextOnly($pass)){return false;} // Look up user in DB $getUser = $loginConnector-&gt;query("SELECT * FROM `utenti` WHERE `usr` = '".$user."' AND `psw` = PASSWORD('".$pass."') AND `gruppo` &lt;= ".$group." AND `attivo` = 1"); $this-&gt;userdata = $loginConnector-&gt;fetchArray($getUser); if ($loginConnector-&gt;getNumRows($getUser) &gt; 0){ // Login OK, store session details // Log in $_SESSION["user"] = $user; $_SESSION["pass"] = $this-&gt;userdata['pass']; $_SESSION["gruppo"] = $this-&gt;userdata['gruppo']; if ($goodRedirect) { header("Location: ".$goodRedirect); } return true; }else{ // Login BAD unset($this-&gt;userdata); if ($badRedirect) { header("Location: ".$badRedirect) ; } return false; } } } } </code></pre> <p>And this is the function to get the users:</p> <pre><code>class DbUser extends DbConnector{ ... function getUserArray() { while ($row = mysql_fetch_object($this-&gt;user_result)) { $this-&gt;users[$row-&gt;id] = $row; } return $this-&gt;users; } } </code></pre> <p>I know it's a difficult-to-explain question, so let me know if I need to specify something else... Thanks</p> <p>EDIT: The error is in Validator class and in this function (the line with preg_match() ):</p> <pre><code>function validateTextOnly($theinput,$description = ''){ $result = preg_match ("/^[A-Za-z0-9\ ]+$/", $theinput ); if ($result AND $theinput!=''){ return true; }else{ $this-&gt;errors[] = $description; return false; } } </code></pre> <p>GREAT NEWS: I found where the error was, but I'm not able to understand why this code doesn't work:</p> <pre><code>$user_connector = new DbUser(); $all_users = array(); $all_users = $user_connector-&gt;getUsers(); foreach($all_users as $id =&gt; $user){ ... } </code></pre> <p>The foreach statement is the point: when I'm using <code>$all_user</code> as <code>$id=&gt;$user</code>, it actually overwrite the content of $_SESSION['user'] with the last object used in the cycle (an "user" object). Anyone can explain me how a local variable can overwrite a session one? I would like to make it clear: I solve the problem (changing <code>$id =&gt; $user</code> with <code>$id =&gt; $userObj</code>), but I'm looking for an explanation. Thanks!</p>
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    1. COCan we have the error message ?
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    2. COOf course, but I don't think is useful... Is an error about the Validator class: Warning: preg_match() expects parameter 2 to be string, object given in /web/htdocs/www.subamiata.it/home/nuovo/includes/Validator.php on line 21
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    3. COwell, now show Validator.php and we will look at the 21 line.
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