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POQuestions about User Authorization in PHP
 

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  1. POQuestions about User Authorization in PHP
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    <p>I'm trying to build a simple user authorization system where a .txt file stores the username and password information. I know this probably should be done differently (via databases), but I'm doing this for practice. If anyone could help me with my questions, it would be greatly appreciated. </p> <p>So far I have the register.php and login.php built, but I'm not sure where to go from here. Here are my three questions:</p> <ol> <li><p>Let's say I have an html site that I want protected. How would I incorporate the login.php so if a user who is not logged in tries to access the content of the pages, they are prompted to log in? Would I have to put something in the of each html page?</p></li> <li><p>How would I implement cookies in this process? A user who logged in shouldn't have to re-login for 20 minutes. Ideally, I would want to send the cookies after the user has logged in, but how would I do this?</p></li> <li><p>I want my register.php to check for existing users so all names are unique. What I have so far does not do this correctly. What is wrong with my code?</p></li> </ol> <p>Here is my code:</p> <p>LOGIN.PHP</p> <pre><code>&lt;?php $check = 0; if (isset($_POST['submit'])) { $name = htmlentities($_POST['name']); $name = strtolower($name); $password = htmlentities($_POST['apw']); $filename = getcwd() . "/psverification.txt"; $lines = file( $filename , FILE_IGNORE_NEW_LINES ); printf ("Hi %s,&lt;/br /&gt;", $name); foreach($lines as $key =&gt; $line) { list($username, $pw) = explode('|', $line); if($username == $name &amp;&amp; $pw == $password) $check++; break; } if ($check == 1){ //Redirect to home page Header("Location: index.html"); } else{ printf("Your username or password are invalid. Please try again."); } } ?&gt; &lt;form method = "POST" action = "&lt;?php echo $_SERVER['PHP_SELF']; ?&gt;"&gt; &lt;p&gt; Username:&lt;br /&gt; &lt;input type = "text" id="name" name="name" size="20" maxlength="40" /&gt; &lt;/p&gt; &lt;p&gt; E-mail Address:&lt;br /&gt; &lt;input type = "text" id="apw" name="apw" size="20" maxlength="40" /&gt; &lt;/p&gt; &lt;input type="submit" id="submit" name ="submit" name ="submit" value="Log in" /&gt; &lt;p&gt; &lt;a href="register.php"&gt;Register&lt;/a&gt;&lt;/p&gt; &lt;/form&gt; </code></pre> <p>REGISTER.PHP</p> <pre><code>&lt;?php if (isset($_POST['submit'])) { $username = $_POST['user']; $password = $_POST['password']; $confirmpw = $_POST['confirmpw']; $username = strtolower($username); //Check if passwords match if ($password != $confirmpw){ print "Passwords do not match, please try again."; } else{ //the data $data = "$username|$password\n"; //open the file and choose the mode $fh = fopen("psverification.txt", "a+"); // Cycle through the array while (($buffer = fgets($fh, 4096)) !== false) { // Parse the line list($usercheck, $passwordcheck) = explode('|', $buffer); if (trim($usercheck) == $username) { print "The username is already in our system. Please use another one.";} else { fwrite($fh, $data); //Redirect to home page Header("Location: index.html"); } } //close the file fclose($fh); } } ?&gt; &lt;form method = "POST" action = "&lt;?php echo $_SERVER['PHP_SELF']; ?&gt;"&gt; &lt;p&gt; Username:&lt;br /&gt; &lt;input type = "text" id="user" name="user" size="20" maxlength="40" /&gt; &lt;/p&gt; &lt;p&gt; Password:&lt;br /&gt; &lt;input type = "password" id="password" name="password" size="20" maxlength="40" /&gt; &lt;/p&gt; Confirm Password:&lt;br /&gt; &lt;input type = "password" id="confirmpw" name="confirmpw" size="20" maxlength="40" /&gt; &lt;/p&gt; &lt;input type="submit" id="submit" name ="submit" name ="submit" value="Register" /&gt; &lt;/form&gt; </code></pre> <p>Thanks in advance. Any examples would be greatly appreciated. </p>
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    1. COYou should probably break this up into separate questions. At least the #3 part as it isn't conceptual, but your actual code.
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    2. COAgreed. Separate, more specific questions would be more appropriate.
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    3. CO@all I appreciate your answers. I wish I could mark everyone's answer as "accepted"...they all help me a great deal.
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