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PHP - A Poor Understanding Of Sessions
Basically, I've developed a basic registration and login code whereby it inserts and retrieves data from MySQL, however my login code is giving me problems in a sense that I don't understand the concept of the "session" feature, my understanding of it, is that it places a cookie on your computer and verifies it on each request called by the page with the start_session() function on it, if so, is this correct?
My Header for all pages: <?php session_start(); ?> When the client logs in successfully: $_SESSION["myusername"] = $myusername; $_SESSION["mypassword"] = $mypassword; // Both Local variables ($myusername and $mypassword) are from the matching database and client entered values. When the client navigates to a completely different page: if (isset($_SESSION['myusername'])) { // Do x } else { // Do y } // It is never doing X for me. Thanks! Regards Matthew Similar TutorialsHi All I have a basic login system on my site. How would I go about displaying the current logged in user information from the session Id. its quite confusing..... <?php require 'Mysql.php'; class Membership { function validate_user($un, $pwd) { $mysql = New Mysql(); $ensure_credentials = $mysql->verify_Username_and_Pass($un, ($pwd)); if($ensure_credentials) { $_SESSION['status'] = 'authorized'; header("location: ../selfbuild/Controlpanel.php"); } else return "Please enter a correct username and password"; } function log_User_Out() { if(isset($_SESSION['status'])) { unset($_SESSION['status']); if(isset($_COOKIE[session_name()])) setcookie(session_name(), '', time() - 1000); session_destroy(); } } function confirm_Member() { session_start(); if($_SESSION['status'] !='authorized') header("location: login.php"); } } Just need to display the user name at the moment but am kinda not getting how its done. Do I just need <?php session_start(); echo $un I have been struggling with understanding sessions and I think I finally understand it, but I want to make sure. Say you had a catalog page with products and A quantity text field. the session code would be something like this: Code: [Select] session_start(); $_SESSION ['product_id']=$product_id; $_SESSION ['quantity']=$quantity; that code would go on the catalog page and the checkout page, right? The only thing I'm not quit clear on is what goes in the [] Hello! So i have an echo like such <?php echo $_SESSION['email']; ?> Is there documentation or perhaps provide an example where/how I can pull this email from the same row of information in the MySQL database? Doing this without a require_once php page that has this information?
Googling didn't really help.
Many thanks for being part of my journey! Edited January 28 by PandeeHi all, I am creating a thumbnail from an uploaded image (in this case a company logo). The problem is that the thumbnail image is poor quality and not fit to display on the website! I have attached the uploaded image and then then generated thumbnail, so you can see how much it is degrading. I always want the thumb to be the same size, which is 129pxx44px. I have included the thumb generation part of my script below: // This is declared at the start of the script $tdir = "images/agencylogos/thumbs/"; $twidth = "129"; $theight = "44"; // This is the actual part of the script that does the resizing $simg = imagecreatefromjpeg($newname); $currwidth = imagesx($simg); $currheight = imagesy($simg); if ($currheight > $currwidth) { $zoom = $twidth / $currheight; $newheight = $theight; $newwidth = $currwidth * $zoom; } else { $zoom = $twidth / $currwidth; $newwidth = $twidth; $newheight = $currheight * $zoom; } $dimg = imagecreate($newwidth, $newheight); imagetruecolortopalette($simg, false, 256); $palsize = ImageColorsTotal($simg); imagecopyresized($dimg, $simg, 0, 0, 0, 0, $newwidth, $newheight, $currwidth, $currheight); // Copy Resized Image To The New Image (So We Can Save It) imagejpeg($dimg, "$tdir" . $image_name, 100); imagedestroy($simg); imagedestroy($dimg); Can anyone see any ways of improving this script so that it would make the thumb image better quality? Many thanks, Greens85 Hi, can someone help me figure out why the logo div isn't centering? Code: [Select] <?php require_once("functions.php"); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> <style type="text/css"> td { border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-left-style: solid; border-top-color: #30C; border-right-color: #30C; border-bottom-color: #30C; border-left-color: #30C; } </style> <link href="doggyTreats.css" rel="stylesheet" type="text/css" /> </head> <body> <?php [color=yellow]logo();[/color] navBar(); echo "<div id=\"mainContent\">"; echo "<form action=\"\" method=\"post\" name=\"catalog\">"; DatabaseConnection(); $query = "SELECT * FROM treats"; $result_set = mysql_query($query) or die(mysql_error()); $i = 0; echo "<table>"; while ($row = mysql_fetch_array($result_set)) { echo"<tr><td width=\"2s00px\"><img src=\"{$row['product_pic']}\" /></td><td width=\"200px\">{$row['product_title']}.<br /><br />{$row['product_Description']}.<br /> Price: \${$row['price']}.<br /><br />Quantity <input name=\"quantity\" type=\"text\" size=\"2\" /></td></tr>"; } echo "<tr>"; echo "<td><input name=\"submit\" type=\"button\" value=\"Proceed to Checkout\" />"; echo "</table>"; echo "</form>"; echo "</div>"; footer(); ?> </body> </html> Code: [Select] #navBar { background-color: #060; width: 200px; padding-top: 50px; padding-bottom: 250px; float: left; } #navBar #menu { margin-right: 6px; } .menuOption { background-image: url(assets/bone2a.gif); background-repeat: no-repeat; padding-bottom: 25px; list-style-type: none; height: 20px; padding-top: 26px; text-align: center; } body { background-color: #0089cc; }[color=yellow] #logo { text-align: center; margin-top: 5px; height: 123px; width: 182px; }[/color] #footer { font-style: italic; text-align: center; } .shoppingCart tr th { padding: 5px; } .shoppingCart tr td { padding: 5px; } #mainContent { width: 350px; margin-top: 30px; } Code: [Select] <?php [color=yellow]function logo() { echo "<div id=\"logo\">"; echo "<img src=\"assets/logo.gif\" alt=\"logo\" />"; echo "</div>"; }[/color] function footer() { echo "<div id = \"footer\">"; echo "Auntie Vic\'s Treatery <br />"; echo "PO Box 34092 <br />"; echo "Clermont, IN 46234 <br />"; echo "317-701-0343 <br />"; echo "<a href=\"mailto:auntievics@gmail.com\">Email Us</a>"; echo "</div>"; } function navBar() { echo "<div id = \"navBar\">"; echo "<ul id=\"menu\">"; echo "<li class=\"menuOption\"><a href=\"index.html\">Home</a></li>"; echo "<li class=\"menuOption\"><a href=\"aboutUs.html\">Management Team </a></li>"; echo "<li class=\"menuOption\"><a href=\"treats.html\">Treats </a></li>"; echo "<li class=\"menuOption\"><a href=\"charities.html\">Supported Charities</a></li>"; echo "<li class=\"menuOption\"><a href=\"order.html\">Orders</a></li>"; echo "</ul>"; echo "</div>"; } ?> I have a system that I want to change. I'm attempting to convert a huge project I made with mysql to PDO. I have many cases where I would use a WHILE statement to return a query array. Code: [Select] while($row= mysql_fetch_array($result)){From what I've seen so far, it looks as though I need to use a foreach statement to do the same task. Code: [Select] foreach ($dbh->query($sql) as $row){ Is that correct? Hello, After a user gets input into my Users table in my database, I'm using lastInsertId() to grab the newly created ID and then enter the newly created ID (along with some other stuff) into a separate table. Could this potentially be a problem? In other words, what happens if 2 users on 2 different computers both sign up a the same time? How will be database know which lastInsertId() to use? Here's my current code: $dbWrite->insert('users', $data); $last_id = $dbWrite -> lastInsertId(); // get the ID that was just created $data = array ('course_id' => $_POST['course_id'], 'user_id' => $last_id); $dbWrite->insert('course_enrollment', $data); // Use that new ID in a different table Perhaps there's a way to combine the steps? Thank you for your thoughts... Hi i'm new to the forum and i'm wondering if anyone here could help me out with the problem i'm having. the script i have uses $_SESSION['userid'] = $users['id']; and i'm not exactly sure how to read that .. any information would be helpful. thanks in advance Can someone explain to me in plain English what is the purpose of imagecreatefromgif?? I read the Manual but am not really understanding what purpose it servers in the larger image rendering process. Also, how should I Error-Handle this function - if at all?! Thanks, Debbie Hi guys Sorry i keep asking noob questions today... I'm working on something that has a user facing image upload facility. So i'm slowly working through a class to make this as secure as possible. One of the tips online is to use the method "is_uploaded_file ( )". According to php.net - "Returns TRUE if the file named by filename was uploaded via HTTP POST. This is useful to help ensure that a malicious user hasn't tried to trick the script into working on files upon which it should not be working--for instance, /etc/passwd. " I'm not one to just use things without understanding why. So how exactly could someone get a script to work on an internal file via a browse/upload facility? I don't really understand what htmlentities() does and when to use it?! The manual says this... <?php $str = "A 'quote' is <b>bold</b>"; // Outputs: A 'quote' is <b>bold</b> echo htmlentities($str); // Outputs: A &#039;quote&#039; is <b>bold</b> echo htmlentities($str, ENT_QUOTES); ?> 1.) Isn't there a way to print this... Code: [Select] $str = "A 'quote' is <b>bold</b>"; ...as this... Quote A 'quote' is <b>bold</b> That is, WYSIWYG. 2.) When and why would you want this displayed... Quote A 'quote' is <b>bold</b> I am trying to make my code more secure, and I was told to use something like this on all code that comes from the User and needs to be output, but I'm a little lost here... echo ' <div class="userInfo"> <a href="#" class="username"> <strong>' . nl2br(htmlentities($username)) . '</strong> </a>'; Debbie Code: [Select] $result = mysql_query("SELECT * FROM Chords_Loops_Lyrics ORDER BY MusicFiles_ID ASC"); while($row = @mysql_fetch_array($result)){ $Chords_Loops_Lyrics = array($row['CCL_ID'] => $row['MusicFiles_ID'], $row['Type'], $row['FileName']); } I know I'm doing this wrong, because of the results. How can I assign values to this array, when I do a print r on this, it only spits out the last value. I need to store like 100 of these "chord loops and lyrics" into an array with the values you see in the $row fields. I just can't seem to find how to properly write this in php. Hi.
I've been trying to understand the concept of password_hash but so far it has eluded me!
registration
<?php
if(isset($_POST['submit'])){
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];
//$pass_hash = PassHash::hash($_POST['password']);
$hash = password_hash($password, PASSWORD_BCRYPT);
$stmt = $pdo->prepare("INSERT INTO hash_test(name, email, password) VALUES(:name, :email, :password)");
$stmt->execute(array(
':name' => $name,
':email' => $email,
':password' => $hash
));
if ($stmt->rowCount() ==1){
echo "Registration Successful";
}else{
echo "There was a problem taking your request";
}
}
?>
The registration is working fine and all fields are inserted. The problem is when loggin in, its giving me an error : unknown variable which is the $hash. The verify parameter is thus:
password_verify($password, $hash)
I believe the $password is the users password for login, now how/when/where do assign a value to $hash? since in my db i have email(username) password. Do i need to store the hash separately on the db? Can someone please enlighten me more
my login code
<?php
if(isset($_POST['login'])){
$password = $_POST['password'];
$stmt = $pdo->prepare("SELECT email, password FROM hash_test WHERE email=:email AND password=:password");
$stmt->execute(array(
':email' => $_POST['email'],
':password' =>$password
));
//if ($stmt->rowCount() ==1){
if (password_verify($password, $hash)) {
/* Valid */
echo "Right";
} else {
/* Invalid */
echo "wrong";
}
//}
}
?>
THANKS
I need some help understanding the below syntax (the ? and the colon are throwing me) isset($_POST['cardType']) ? $_POST['cardType'] : ''; Thanks for any help on this .. Frank Hi.
I haven't done a lot of OOP. Hardly any really. I've had a go at writing a very small class that outputs a greeting depending on what time of day it is. What do the OOP experts here make of it? What do you like, what do you hate? Is there anything I could do to make it more useful?
Here is the code;
class Greeting {
// the __construct didn't do what I originally wanted. Denfine the hour outside the method (I don't know why this is a good/bad idea)
/*
public function __construct()
{
$hour_of_day = date('G');
}
*/
public function callGreetingPhrase()
{
return $this->getGreetingPhrase();
}
// the setter doesn't seem to have a purpose here. I tried using it so that I could pass in a value of my choosing (for testing purposes) can't get it to work though
/*
public function setGreetingPhrase($value)
{
$this->hour_of_day = $value;
}
*/
private function getGreetingPhrase()
{
$hour_of_day = date('G');
if($hour_of_day < 12 ) { // if it's before 12pm
$greeting_phrase = "good morning";
} elseif($hour_of_day >= 12 && $hour_of_day < 18 ) { // if it's after 12pm but before 6pm
$greeting_phrase = "good afternoon";
} else { // what is left over - after 6pm until midnight
$greeting_phrase = "good evening";
}
return $greeting_phrase;
}
}
$greeting = new Greeting;
echo $greeting->callGreetingPhrase();
It annoyed me that I could 't figure out how to use the __constructor here to store the hour. But should that have bothered me?
Can someone maybe explain a bit about the setter that I tried to use setGreetingPhrase. I only put it in because I've seen other Classes with one. Could I use a setter method here for anything useful?
Any feedback appreciated!
I come from a long line of down to earth, hard-up, and linear programmers and I've been introduced to the wonders of web. But now I'm a bit lost. Okay, I know much about programming concepts with experience with C++, C#, and assembly, but I can't seem to tame PHP. I've written some code to act as a sort of framework in the spirit of the M-V-C pattern, but I don't know what's happening to my instantiations! I've been reading up on the help files, documentations, and looking up excellent code, but I still don't know what's happening. I'm totally in the dark. Can someone point me to the light? I create my includes (global variables), and local variables, and even classes, but I seem to lose the instantiation of these objects when I navigate more than three pages from my index. What's happening and how do I avoid this? So I have been around the net a few times reading tutorials, watching vids as I try to teach my self php. I have come across a few items that I am having trouble understanding. The first is the use of the % symbol. For example I commonly see the % used in generating random strings of characters. Here is piece of the code I used to generate a random string. What is the purpose of % in this statement. if ($alt == 1) { $rndPKID .= $consonants[(rand() % strlen($consonants))]; $alt = 0; } else { $rndPKID .= $vowels[(rand() % strlen($vowels))]; $alt = 1; } The second is the use of the & or as it is better known. The ampersand symbol. I commonly see it used when declaring a function. function newfunction($var1, &$var2){ //Do Stuff Here. } Can anyone help me understand those 2 symbols purpose and usage in php? Hi All, I'm trying to understand the logic behind this bit of code I found. I (think I) get that it takes an argument which in this case is a number, an checks to see if the array isset, then uses a while loop to loop through the possible values taking each value and placing it into another function which performs some task. What I'm really confused about is how the code is using unset, If I'm correct it's unsetting the incremented value which is the value that should be used in the next iteration, now I know this is not the case, but I don't understand why this is working. I have included the code in the topic and I also wrote a small piece of code to mirror this so I could play around with it in hopes of understanding the logic but it gives me a syntax error in my IDE when I try to unset the incremented value. I know this is probably something really stupid so be kind. <?php define("NUM_0", 0); define("NUM_1", 1); define("NUM_2", 2); define("NUM_3", 3); define("NUM_4", 4); function function_1($position) { static $positions = array(NUM_0, NUM_1, NUM_2, NUM_3, NUM_4,), $index = 0; if (isset($positions[$index])) { while ($position >= $index) { $current_position = $positions[$index]; unset($positions[$index++]); function_2($current_position); } } } function function_2($position) { switch ($position) { case 0: echo '$position equals 0 <br />'; break; case 1: echo '$position equals 1 <br />'; break; case 2: echo '$position equals 2 <br />'; break; case 3: echo '$position equals 3 <br />'; break; case 4: echo '$position equals 4 <br />'; break; } } function_1(NUM_4); [b] [u]output![/u] $position equals 0 $position equals 1 $position equals 2 $position equals 3 $position equals 4 [/b] function test() { static $var_1; $var_1 = 10; if (isset($var_1)) { while ($var_1 >= 0) { $var_2 = $var_1; unset ($var_1++); // syntax error on this line. echo $var_2; } } } test(); ?> Let's see.... You add values to variables but you can declare them before assigning a value... Loops are great - they do things until a specific criteria is met....then I exit or break out of them. Functions are code that do specific tasks (or series of tasks) & can be called upon at any given time during a script. An array is like a....hotel with many different rooms - each room being a different value. I get GET and POST...and know how to use them between pages. Sessions can be used to pass data between pages - they help to keep track of things.... Cookies are like little signatures from your script that you can give to a users browser for any number of reasons. I guess you could say I'm starting to get it. It's only been 4 months. That being said can someone give me a brief and yet simple summary of what a PHP Class is... |
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