PHP - Add Number To Session Value
Hi all,
I'm trying to build a simple shopping cart, there are only 8 products and I want to save the quantity value into a section for each product (product1, product2, etc). I'm having a problem where the I can't get the session value to increase by one if the same item is added to the cart again. Here is the code I have so far, am I missing something or is there a php setting that would cause this not to work. <?php session_start(); // setup if(!isset($_SESSION['product1'])) $_SESSION['product1'] = 0; if(!isset($_SESSION['product2'])) $_SESSION['product2'] = 0; if(!isset($_SESSION['product3'])) $_SESSION['product3'] = 0; if(!isset($_SESSION['product4'])) $_SESSION['product4'] = 0; if(!isset($_SESSION['product5'])) $_SESSION['product5'] = 0; if(!isset($_SESSION['product6'])) $_SESSION['product6'] = 0; if(!isset($_SESSION['product7'])) $_SESSION['product7'] = 0; if(!isset($_SESSION['product8'])) $_SESSION['product8'] = 0; // add product if(mysql_escape_string($_GET['add']) != '') { $addItem = mysql_escape_string($_GET['add']); $_SESSION["product$addItem"] = $_SESSION["product$addItem"] + 1; } echo "product$addItem = ".$_SESSION["product$addItem"]; ?> Thanks! Similar TutorialsI'm getting the dreaded " Invalid parameter number: number of bound variables does not match number of tokens" error and I've looked at this for days. Here is what my table looks like:
| id | int(4) | NO | PRI | NULL | auto_increment | | user_id | int(4) | NO | | NULL | | | recipient | varchar(30) | NO | | NULL | | | subject | varchar(25) | YES | | NULL | | | cc_email | varchar(30) | YES | | NULL | | | reply | varchar(20) | YES | | NULL | | | location | varchar(50) | YES | | NULL | | | stationery | varchar(40) | YES | | NULL | | | ink_color | varchar(12) | YES | | NULL | | | fontchosen | varchar(30) | YES | | NULL | | | message | varchar(500) | NO | | NULL | | | attachment | varchar(40) | YES | | NULL | | | messageDate | datetime | YES | | NULL |Here are my params: $params = array( ':user_id' => $userid, ':recipient' => $this->message_vars['recipient'], ':subject' => $this->message_vars['subject'], ':cc_email' => $this->message_vars['cc_email'], ':reply' => $this->message_vars['reply'], ':location' => $this->message_vars['location'], ':stationery' => $this->message_vars['stationery'], ':ink_color' => $this->message_vars['ink_color'], ':fontchosen' => $this->message_vars['fontchosen'], ':message' => $messageInput, ':attachment' => $this->message_vars['attachment'], ':messageDate' => $date );Here is my sql: $sql = "INSERT INTO messages (user_id,recipient, subject, cc_email, reply, location,stationery, ink_color, fontchosen, message,attachment) VALUES( $userid, :recipient, :subject, :cc_email, :reply, :location, :stationery, :ink_color, :fontchosen, $messageInput, :attachment, $date);"; And lastly, here is how I am calling it: $dbh = parent::$dbh; $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING); if (empty($dbh)) return false; $stmt = $dbh->prepare($sql); $stmt->execute($params) or die(print_r($stmt->errorInfo(), true)); if (!$stmt) { print_r($dbh->errorInfo()); }I know my userid is valid and and the date is set above (I've echo'd these out to make sure). Since the id is auto_increment, I do not put that in my sql (though I've tried that too), nor in my params (tried that too). What am I missing? I feel certain it is something small, but I have spent days checking commas, semi-colons and spelling. Can anyone see what I'm doing wrong? Hello,
I have problem durring binding update query. I can't find what is causing problem.
public function Update(Entry $e) { try { $query = "update entry set string = $e->string,delimiter=$e->delimiter where entryid= $e->id"; $stmt = $this->db->mysqli->prepare($query); $stmt->bind_param('ssi',$e->string,$e->delimiter,$e->id); $stmt->close(); } catch(Exception $ex) { print 'Error: ' .$ex->getMessage(); } }When I run function update I'm getting next error:Warning: mysqli_stmt::bind_param(): Number of variables doesn't match number of parameters in prepared statement Can you help me to solve this problem ? Edited by danchi, 17 October 2014 - 10:25 AM. I need to display a number(the number is retrieved from the db) in the form input field such that only the last 4 digits is visbile, the remaining can be masked as * or X or whatever is applicable. I know the last 4 can be obtained as follows: Code: [Select] $number=substr($number,-4,4); But when i hit the submit button the form validates the input field and checks if the number is a valid number of a specific format. Therefore when I click on the submit button then I should still be able to unmask the masked numbers or do something similar that would help me validate the whole number. Code: [Select] <input type="text" name="no" value="<?php if(!empty($number)){ echo $number;} ?>"> I am having trouble resolving an error. Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/s519970/public_html/header.php:27) in /home/s519970/public_html/admin/login.php on line 2 What I can gather is I can't use "header (Location: 'admin.php')" after i've used session_start(). I have tried to replace the header (Location: 'admin.php') with this: echo "<script>document.location.href='admin.php'</script>"; echo "<script>'Content-type: application/octet-stream'</script>"; I've been trying to read up on solutions but haven't been able to get it sorted. If anyone can offer some advice that would be greatly appreciated as im new to php. Code: [Select] <?php session_start(); if(isset($_SESSION['user'])) echo "<script>document.location.href='admin.php'</script>"; echo "<script>'Content-type: application/octet-stream'</script>"; ?> <div id="loginform"> <form action="dologin.php" method="post"> <table> <tr> <td><span>Username:</span></td> <td><input type="text" name="username" /></td> </tr> <tr> <td><span>Password:</span></td> <td><input type="password" name="password" /></td> </tr> <tr> <td colspan="2" align="right"><input type="submit" name="login" value="Login" /></td> </tr> </table> </form> </div> I have tried using require_once('yourpage.php'); before my <head></head> tags in the header document where I've specified the html information but this doesn't seem to work. I've been advised to use ob_start("ob_gzhandler"); but I am not sure how to implement this. Any advice is greatly appreciated! I am trying to create an index page which contains registration and login field the problem that i get is on successful login a warning is displayed session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at C:\xampp\htdocs\Eventz.com\index.php:116) in C:\xampp\htdocs\Eventz.com\index.php on line 235 This is the login part of my index.php this tag is inside an html table below the login form I also have a registration form and its php code above the login form Code: [Select] <?php if (isset($_REQUEST['pass'])) { $id=$_POST['id']; $pass=$_POST['pass']; $conn =mysql_connect("localhost","root",""); if (!$conn) { die('Could not connect: ' . mysql_error()); } /* checking connection....success! */ $e=mysql_select_db('test', $conn); if(!$e) { die(''.mysql_error()); } else { echo 'database selected successfully'; } if (isset($_REQUEST['id']) || (isset($_REQUEST['pass']))) { if($_REQUEST['id'] == "" || $_REQUEST['pass']=="") { echo "login fields cannot be empty"; } else { $sql=mysql_query("Select email,password from login where email='$id' AND password='$pass'"); $count=mysql_num_rows($sql); if($count==1) /* $count checks if username and password are in same row */ { session_start(); $_SESSION['id']=$id; echo "</br>Login Successful</br>"; } else { echo "</br>invalid</br>"; echo "please try to login again</br>"; } } } } ?> Any help or suggestion would be appreciated in this page http://maximaart.com/newscp/ i have this problem Code: [Select] Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/maximasy/public_html/newscp/index.php:1) in /home/maximasy/public_html/newscp/index.php on line 2 my source code is <?php session_start(); include_once("config.php"); include_once("functions.php"); $errorMessage = ''; if (isset($_POST['txtUserId']) && isset($_POST['txtPassword'])) { if ($_POST['txtUserId'] === "$user" && $_POST['txtPassword'] === "$pass") { // the user id and password match, $_SESSION['basic_is_logged_in'] = true; require("main.php"); exit;?> Hey I have a string that looks like the following: Quote top-php-tutorials-2.html I have a script that cycles through each page. The 2 in the quote above is the page number. How can I extract the number between the - and the .html and replace it with another number? I've tried Code: [Select] substr($engine->selectedcaturl, 0,-6).$v.".html"But then I realised this only works for numbers that are 1 digit long Any input would be appreciated I'm making a simple login system with MySQL and PHP (very simple, I'm just starting with PHP). The MySQL portion is done, but I need to ensure only people who are logged in can see certain content. To check if people are logged in, my website checks that they have the $_SESSION['user'] variable set. If it is set, then it lets them continue through the website, if not, it tells them to login. Is that enough security, or can people simply inject a session cookie into their browser to spoof that they are logged in? My idea was to generate a session key cookie when they login (just a random string of letters and numbers) and store that in the database, then on every page, check to make sure their session key is the same thing that's in the database. Is this necessary? It seems expensive. hi everyone. i'm wondering what the best way is to create a session variable and pass it to an iframe. i need to do something along these lines, but it doesn't seem to pass the ID. Any hints on how i should accomplish this? Code: [Select] session_start(); $_SESSION['ID']=$_GET['ID']; // id from previous page $ID=session_id(); <iframe src="iframepage.php?ID=<?php echo $ID; ?>" style="width:680px; height:200px;" noresize="noresize" frameborder="0" border="0" scrolling="Yes" allowtransparency="true" /> </iframe> Just curious how other people feel about this. I am working on an application where a lot of info is pulled from MySQL and needed on multiple pages.
Would it make more sense to...
1. Pull all data ONCE and store it in SESSION variables to use on other pages
2. Pull the data from the database on each new page that needs it
I assume the preferred method is #1, but maybe there is some downside to using SESSION variables "too much"?
Side question that's kind of related: As far as URLs, is it preferable to have data stored in them (i.e. domain.com/somepage.php?somedata=something&otherdata=thisdata) or use SESSION variables to store that data so the URLs can stay general/clean (i.e. domain.com/somepage.php)?
Both are probably loaded questions but any possible insight would be appreciated.
Thanks!
Greg
Edited by galvin, 04 November 2014 - 10:30 AM. Evening! I've been iffing and ahhing over this and well im not too sure, hence the post. Code: [Select] // Redirects if there is no session id selected and echos the error on the previous page if(!isset($_GET['get']) || ($_GET['getget'])){ header("Location: #.php?error"); } So it should simply check if get is set if it isnt then see if getget is set? If not redirect and show the error. Now ive tried it and even when get/getget is set it still redirects, probably something silly. Care to share anyone? Harry. hello, i have a start time and an end time (no dates). the following works great, except for when the start time is at night, and the end time is in the morning. im thinking if i can do an if the number is negative, add 24, that it will resolve my issue. any ideas? Code: [Select] $tbilled = $tfinish - $tstart; Hello Everyone, i have developed one WAP application, i want to get MSISDN number of users who visit my site. My operator has also white listed my WAP application. I am getting MSISDN successfully on couple of Samsung Mobiles, but not getting same result on NOKIA, BLACKBERRY AND I PHONE or any other device. Please suggest me best way to get MSISDN number for all devices. Thanks, Nirav I m printing the prices of the items in my db. I want to print the prices like ; Price --- The format I want 75.000 --- 75 75.500 --- 75.5 100 --- 100 100.5 --- 100.5 1234.654 --- 1,234.654 1234.200 --- 1,234.2 1123456.789 --- 1,123,456.789 Simply I want to cancel the zeros after dot, and want to put comma every 3 digits before the dot. How can I do this ? I am trying to create a registration form where users put their name, email and password only.
but i want to write an auto generated account number into database table for each user e.g; XY1234567 where XY should not change 1234567 auto generated random number and no duplicates (in numbers only).
example...
XY1234567
XY2345678
XY2233455
i found code
$num_of_ids = 10000; //Number of "ids" to generate. $i = 0; //Loop counter. $n = 0; //"id" number piece. $l = "AAA"; //"id" letter piece. while ($i <= $num_of_ids) { $id = $l . sprintf("%04d", $n); //Create "id". Sprintf pads the number to make it 4 digits. echo $id . "<br>"; //Print out the id. if ($n == 9999) { //Once the number reaches 9999, increase the letter by one and reset number to 0. $n = 0; $l++; } $i++; $n++; //Letters can be incremented the same as numbers. Adding 1 to "AAA" prints out "AAB". }but its not working as i want. Any help please? Edited by 684425, 27 December 2014 - 12:58 PM. How can I test if a string has a number at the end? i.e. smith1 instead of smith? I won't know how long the string is or whether there is more than 1 number but I will know that the string's last character is a number. Thank you! Hi I have this code and when I echo the count it shows 1 when theres actually 5. Have I wrote it wrong $loginsq = mysql_query("SELECT email FROM logindetails WHERE email = ".$_SESSION['MM_Username'].""); $logins = mysql_fetch_array($loginsq); $logs = count($logins); echo $logs; Hi, I want to chenge the following statement so that numbers ending with ".00" are changed to blank. Many opinions but I haven't got any to work. Any help? <td align=right class="currency">$'.number_format($row['value1'],2).'</td> hi guy's i have on one page select from table, and i don't know how to limit showing content from database on 3, and rest to make number under it and when i click on that number next 3 is showen? Something like on forum when you have more topics then you can show, on botom of page are showen numbers (links). Can some explain me how to do this? i put in while loop something like this Code: [Select] while ($prom = mysql_fetch_object($res) and $i<3) and now it is limited on showing first 3, my problem is showing next 3, and if there is more how to split it on 3 per page? One more question to ask. I'm trying to do a count of total logins that have happened in the last 5 months including the current one so far. My users_logins table has the following structu users_id, session_id, login_date(datetime), last_activity(datetime). What the end result is going to be is: <tr> <td></td> <th scope="col"><?php echo date("M", strtotime("-4 month")); ?></th> <th scope="col"><?php echo date("M", strtotime("-3 month")); ?></th> <th scope="col"><?php echo date("M", strtotime("-2 month")); ?></th> <th scope="col"><?php echo date("M", strtotime("-1 month")); ?></th> <th scope="col"><?php echo date("M"); ?></th> </tr> <tr> <th scope="row">Logins</th> <td>94</td> <td>53</td> <td>124</td> <td>92</td> <td>105</td> </tr> Where the first td would be May and the last td would be September. Do I have to do this in 4 separate queries. If so here's what I have for the first query. I'm not sure what woudl go for the WHERE. $four_months_ago_query = "SELCT COUNT(date_login) FROM users_logins WHERE ? "; |