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  • Escaping quotes twice in PHP

    - by Genadinik
    Hello, I have a complicated form where I first have to take some _GET parameters and obviously I have to do a mysql_real_escape_string() on them since I look stuff up in the database with them. Them problem for me is after the initial db lookup. When the user submits a form, I send them along as a _POST request and obviously have to do this mysql_real_escape_string call again just in case someone tries to hack my site with a faked form submission. Then the problem I have is the arguments are escaped twice and my queries begin to look strange like this: select field1 , field2 , from my_table where some_id = \'.$lookup_id.\' ... So the system seems to be adding \' and it is messing me up :) Also, in my other forms I have not seen such behavior. Any ideas on what may be causing this? One weird thing is that I tried to send unescaped parameters to the post, and the same problem happens. That is a clue, but not a sufficient one for me. :( Thanks, Alex

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  • Scalability 101: How can I design a scalable web application using PHP?

    - by Legend
    I am building a web-application and have a couple of quick questions. From what I learnt, one should not worry about scalability when initially building the app and should only start worrying when the traffic increases. However, this being my first web-application, I am not quite sure if I should take an approach where I design things in an ad-hoc manner and later "fix" them. I have been reading stories about how people start off with an app that gets millions of users in a week or two. Not that I will face the same situation but I can't help but wonder, how do these people do it? Currently, I bought a shared hosting account on Lunarpages and that got me started in building and testing the application. However, I am interested in learning how to build the same application in a scalable-manner using the cloud, for instance, Amazon's EC2. From my understanding, I can see a couple of components: There is a load balancer that first receives requests and then decides where to route each request This request is then handled by a server replica that then processes the request and updates (if required) the database and sends back the response to the client If a similar request comes in, then a caching mechanism like memcached kicks into picture and returns objects from the cache A blackbox that handles database replication Specifically, I am trying to do the following: Setting up a load balancer (my homework revealed that HAProxy is one such load balancer) Setting up replication so that databases can be synchronized Using memcached Configuring Apache to work with multiple web servers Partitioning application to use Amazon EC2 and Amazon S3 (my application is something that will need great deal of storage) Finally, how can I avoid burning myself when using Amazon services? Because this is just a learning phase, I can probably do with 2-3 servers with a simple load balancer and replication but until I want to avoid paying loads of money accidentally. I am able to find resources on individual topics but am unable to find something that starts off from the big picture. Can someone please help me get started?

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  • How can I embed the result of a rails view in another website?

    - by NotDan
    I would like to allow users to call my ruby on rails app as a service which returns a 'div' with html content in it, and embed that div into their app (which will not be a rails application). For example, assume someone has their own php website that has a header/footer template that gets rendered, and a content area of the page that they need to fill based on some html I generate in my rails app. I would like to allow them, from php, to call to my website, get the 'div' I generate, and embed that as html in their php page. What I'm trying to do is host a service on my site that returns some html content, but actually show that content as part of another site, so that the end user only sees the other site and never really knows about mine. Is this possible?

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  • Can learning a new language (Human not programming) help your career?

    - by Omar Kooheji
    I was wondering if anyone had any experience of learning a new language (a human language not a programming one) and whether is has helped you get ahead in your career. I'm assuming that the new language is one other than English which I think is fairly essential to programming as most programming resources seem to be english. The reason I ask is I speak Arabic and was told that it would give me an edge when I was looking for jobs, and yet so far in my current job it's completely irrelevant and in my last job I had it was used but I didn't get any special "appreciation" for speaking it.

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  • Help with shopping cart in javascript

    - by user228390
    Hey guys, I'm having problems with my shopping cart. What I am trying to do is make a function that will add an item the cart and then and function that will view the cart and show the details. But what I have got so far does not do that, it just simply adds and goes straight to view cart. Also I wanted to store the name of each items in different global arrays (name, price and sum) but I can't get it work that way. Can any help me overcome this problem? Edit: I've tried to get it to work by adding some more items and attaching it to another html page, but now the code does not seem to work at all , before it showed the price and total and now I get nothing . javascript code function round_total (c) { var pennies = c * 100; pennies = Math.round(pennies); var strPennies = "" + pennies; var len = strPennies.length; return parseFloat(strPennies.substring(0, len - 2) + "." + strPennies.substring(len - 2, len)); } // End of round_total function. /* Start of generate_page function. */ function generate_page (form) { tax = 0.08; delivery_p = 2.99; var odate = new Date(); var qty = form.quantity.value; var product_v = new String(form.product.value); var total_price = product_v.substr(product_v.indexOf("$") + 1, product_v.length - product_v.indexOf("$")); var price_without_tax = round_total(qty * total_price); var ttax = round_total(price_without_tax * tax); var delivery = round_total(qty * delivery_p); var total_p = round_total(price_without_tax + ttax + delivery); document.writeln("Quantity: " + qty + "<br>"); document.writeln("Price: $" + total_price + "<br>"); document.writeln("Delivery: $" + delivery + "<br>"); document.writeln("Total: $" + total_p + "<br>"); document.writeln("Order placed on: " + odate.toGMTString()); } function calculate() { round_total (c)(); generate_page (form)(); } HTML code: Shopping cart Welcome, Guest Login Sign Up Stay Updated: Subscribe via RSS Email Updates <div id="header"> <div id="branding" class="container"> <h1>The Finest Toy<br /> Store Online</h1> <p class="desc">If you're looking for a toy shop then look no further.<br/> Go on, treat the kids with our huge selection of<br/>online toy shops selling toys for all ages.</p> </div><!-- end branding --> <div id="navigation"> <ul id="menu" class="container"> <li><a href="#">HOME</a></li> <li><a href="#">ABOUT</a></li> <li><a href="#">Online Store</a></li> <li><a href="#">CONTACT</a></li> </ul> </div><!-- end navigation --> </div><!-- end header --> Shopping Cart Nintendo DS Xbox Product: Console £149.99 Console + Games £169.99 Quantity: Product: Console £149.99 Console + Games £169.99 Quantity:     Playstation 3 Wii Product: Console £149.99 Console + Games £169.99 Quantity:   Product: Console £149.99 Console + Games £169.99 Quantity:        <input type="submit" value="Add to cart" name="submit" onClick="cart()";/><input , type="reset" value="Reset" name="reset" Copyright © 2010 shopping cart. Content and Header © |Back to top Do I need to show my CSS as well? (Sorry about the coding its not working properly for me, its not showing up the way it should be)

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  • How to nicely inform to the user that an unknown error has happened?

    - by Jaime Soriano
    There are several guidelines for error reporting, that are usually based on giving to the user useful information when he or she does something wrong, but to give this kind of information you need to be handling the error and know that it can happen. There are also tons of articles about designing 404 error pages. But, what can you do when it's a new, unhandled error provoked by a failure in the shoftware? Are there some guidelines about how to nicely report totally unexpected errors in a web site, as an unexpected error 500? What header message should be shown in that case? something like "Sorry, an unexpected error has ocurred" would be enough? What information should be given? Should it have mechanisms to help to report the failure to developers? Which ones?

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  • How to read data between two html tags as text.

    - by vijay.shad
    Hi, I am working on a project which needs to extract text form a predefined div tag. My requirement is to send the content in the target div in a email body. I have to use javascript or php for this task. The Process : When a given link will be clicked; a javascript function will trigger and read that target div. The content of the div will be then submitted to server in dynamic form. What options I have to get this task done? Thanks.

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  • Opinions on platform game actor/background collision resolving

    - by Kawa
    Imagine the following scenario: I have a level whose physical structure is built up from a collection of bounding rectangles, combined with prerendered bitmap backgrounds. My actors, including the player character, all have their own bounding rectangle. If an actor manages to get stuck inside a level block, partially or otherwise, it'll need to be shifted out again, so that it is flush against the block. The untested technique I thought up during bio break is as follows: If an actor's box is found to intersect a level box, determine where the centerpoints of each rect are. If the actor's center is higher than the level box's, move the actor so that the bottom of the actor's rect is flush with the top of the level's rect, and vice versa if it's lower. Then do a similar thing horizontally. Opinions on that? Suggestions on better methods? Actually, the bounding rects are XNA BoundingBlocks with their Z spanning from -1 to 1, but it's still 2D gameplay.

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  • How can I set an image for background of GUI interface?

    - by enriched
    hey everyone, im having some troubles displaying the background image for a GUI interface in java. Here is what i have at the moment, and with current stage of code it shows default(gray) background. import javax.swing.*; import java.awt.event.*; import java.util.Scanner; import java.awt.*; import java.io.File; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.IOException; ////////////////////////////////// // 3nriched Games Presents: // // MIPS The Mouse!! // ////////////////////////////////// public class mipsMouseGUI extends JFrame implements ActionListener { private static String ThePDub = ("mouse"); //the password JPasswordField pass; JPanel panel; JButton btnEnter; JLabel lblpdub; public mipsMouseGUI() { BufferedImage image = null; try { //attempts to read picture from the folder image = ImageIO.read(getClass().getResource("/mousepics/mousepic.png")); } catch (IOException e) { //catches exceptions e.printStackTrace(); } ImagePanel panel = new ImagePanel(new ImageIcon("/mousepics/neonglowOnwill.png").getImage()); setIconImage(image); //sets icon picture setTitle("Mips The Mouse Login"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); pass = new JPasswordField(5); //sets password length to 5 pass.setEchoChar('@'); //hide characters as @ symbol pass.addActionListener(this); //adds action listener add(panel); //adds panel to frame btnEnter = new JButton("Enter"); //creates a button btnEnter.addActionListener(this);// Register the action listener. lblpdub = new JLabel(" Your Password: "); // label that says enter password panel.add(lblpdub, BorderLayout.CENTER);// adds label and inputbox panel.add(pass, BorderLayout.CENTER); // to panel and sets location panel.add(btnEnter, BorderLayout.CENTER); //adds button to panel pack(); // packs controls and setLocationRelativeTo(null); // Implicit "this" if inside JFrame constructor. setVisible(true);// makes them visible (duh) } public void actionPerformed(ActionEvent a) { Object source = a.getSource(); //char array that holds password char[] passy = pass.getPassword(); //characters array to string String p = new String(passy); //determines if user entered correct password if(p.equals(ThePDub)) { JOptionPane.showMessageDialog(null, "Welcome beta user: USERNAME."); } else JOptionPane.showMessageDialog(null, "You have enter an incorrect password. Please try again."); } public class ImagePanel extends JPanel { private BufferedImage img; public ImagePanel(String img) { this(new ImageIcon(img).getImage()); } public ImagePanel(Image img) { Dimension size = new Dimension(img.getWidth(null), img.getHeight(null)); } public void paintComponent(Graphics g) { g.drawImage(img, 0, 0, null); } } }

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  • What are the general strategies for the server of an FPS multiplayer game to update its clients?

    - by Hooray Im Helping
    A friend and I were having a discussion about how a FPS server updates the clients connected to it. We watched a video of a guy cheating in Battlefield: Bad Company 2 and saw how it highlighted the position of enemies on the screen and it got us thinking. His contention was that the server only updates the client with information that is immediately relevant to the client. I.e. the server won't send information about enemy players if they are too far away from the client or out of the client's line of sight for reasons of efficiency. He was unsure though - he brought up the example of someone hiding behind a rock, not able to see anyone. If the player were suddenly to pop up where he had three players in his line of sight, there would be a 50ms delay before they were rendered on his screen while the server transmitted the necessary information. My contention was the opposite: that the server sends the client all the information about every player and lets the client sort out what is allowed and what isn't. I figured it would actually be less expensive computationally for the server to just send everything to the client and let the client do the heavy lifting, so to speak. I also figured this is how cheat programs work - they intercept the server packets, get the location of enemies, then show them on the client's view. So the question: What are some general policies or strategies a modern first person shooter server employs to keep its clients updated?

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  • Which programming language is easiest to get a junior position in?

    - by markle976
    I do not have a CS degree but I have lots of intermediate experience with many languages (PHP, C#, Objective-C, Java, VBScript, Actionscript, Javascript, Ruby, etc), mostly freelance or pastime. I have a little experience with Linux (Ubuntu), and a decent bit with Windows. When I look at different languages I find that am interested in most (except maybe VB), but I am not sure what to focus on. So what would be the easiest language to get a job in? Java? PHP? Or would it be easier to get a job as a Junior DBA if I learned Oracle or SQL Server in my spare time?

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  • I want to create a mobile content for mobile users, any help?

    - by Husni Mubarak
    I am new to mobile content developing, but i want to create a mobile content that would allow mobile phone users buy have a money account on thir mobile phones, this is by using their airtime to turn into some kind of money account they will create on their phone. so they can use that account to do transactions with their mobile phone, and also they can also transfer funds from one their mobile phones to another mobile phones. How and where do i start? Help pleasssssssssssssss?

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  • Is it better to adopt the same technologies used at work to be effective on your home projects ?

    - by systempuntoout
    Is it better to start developing an home project using the same technologies used at work to be more productive and effective? I'm not talking about a simple hello world web page but an home project with all bells and whistles that one day, maybe, you could sell on internet. This dilemma is often subject of flames between me and a friend. He thinks that if you want to make a great home-made project you need to use the same technologies used daily at work staying in the same scope too; for example, a c++ computer game programmer should develope an home-made c++ game. I'm pretty sure that developing using the same technologies used at work can be more productive at beginning, but surely less exciting and stimulating of working with other languages\ides\libraries out of your daily job. What's your opinion about that?

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  • assets in dreamweaver

    - by lego69
    can I add to assets in dreamweaver tag <td> I added successfully <table>, but I just can't figure out how can I add <td>, thanks in advance for any help (I'm talking about adding to the library) and can someone recommend way to add to the library new asset using menu

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  • How to split page and reveal stuff underneath?

    - by sudo rm -rf
    Hi there. I've already achieved this on my iPhone app, but I want to know if it's possible on an HTML page, maybe using CSS effects or similar. As you can see, the current view is split, the bottom part is moved down, and another view is revealed underneath. I have a page I'd like to try this on. Any ideas if this is possible, and any specifics as to how I can do it? I'm quite new to HTML coding, so please take it easy on me. :) Thanks in advance!

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  • mysqli prepare statment error?

    - by user310850
    Hi all, $mysqli = new mysqli("localhost", "root", "", "test"); $mysqli->query('PREPARE mid FROM "SELECT name FROM test_user WHERE id = ?"'); //$mysqli->query('PREPARE mid FROM "SELECT name FROM test_user" '); $res = $mysqli->query( 'EXECUTE mid 1;') or die(mysqli_error($mysqli)); while($resu = $res->fetch_object()) { echo '<br>' .$resu->name; } Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1' at line 1 my php version is PHP Version 5.3.0 and mysql mysqlnd 5.0.5-dev - 081106 - $Revision: 1.3.2.27 $

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  • What's the proper approach for writing multi-path "story" flows?

    - by Basiclife
    Hi, I wonder if you can help me. I'm writing a game (2d) which allows players to take multiple routes, some of which branch/merge - perhaps even loop. Each section of the game will decide which section is loaded next. I'm calling each section an IStoryElement - And I'm wondering how best to link these elements up in a way that is easily changed/configured and at the same time, graphable I'm going to have an engine/factory assembly which will load the appropriate StoryElement(s) based on various config options. I initially planned to give each StoryElement a NextElement() As IStoryElement property and a Completed() event. When the vent fires, the engine reads the NextElement property to find the next StoryElement. The downside to this is that if I ever wanted to graph all the routes through the game, I would be unable to - I couldn't determine all possible targets for each StoryElement. I considered a couple of other solutions but they all feel a little clunky - eg Do I need an additional layer of abstraction? ie StoryElementPlayers or similar - Each one would be responsible for stringing together multiple StoryElement perhaps a Series and a ChoicePlayer with each responsible for graphing its own StoryElement - But this will just move the problem up a layer. In short, I need some way of emulating a simple but dynamic workflow (but I'd rather not actually use WWF). Is there a pattern for something this simple? All the ones I've managed to find relate to more advanced control flow (parallel processing, etc.)

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  • How long until programming becomes a professionally certified (and respected as such) skill such as

    - by Michael Campbell
    Given Toyota's recent issues and the ENORMOUS amount of safety that is being relegated to computers, how long do you think it will be before programming, or perhaps programming certain things (embedded transportation software, (air) traffic control, electrical grid, hospital equipment, nuclear plant security, planes, etc.) becomes regulated? And/or, how long before there will be certain regulated certifications before you can call yourself a "software developer", like Architects and Engineers have now? (NB: I'm from the US, so I don't know how it works in other countries; please forgive my ignornace.)

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  • Notepad++ Question

    - by Shane
    I would like a hotkey to Save All in Notepad++ then switch to the browser and refresh the page. I have to do this thousands of times a day and doing the Save All hotkey, then Alt-Tab to the right window, then F5 to refresh again and again, there must be a better solution? I am open to switching editors if there is another that can do this. I have tried using run commands but the problem is although it allows you to make something like [firefox.exe "current file"], if you come down to wanting to open it at a web address like localhost because it needs to run server side, then you have to manually specify the other part of the string, like [chrome.exe "custom var(web address) / filename"] and it always opens a new tab, then creates lots of clutter. Also, if you are editing an include file then it will try to open that instead of the page you want to see when you use the run command, a refresh would be the only realistic method I can think of using.

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  • Web app implementation question.

    - by John Berryman
    I would like to create a web app similar to Stack Overflow in that the users will have different "point" levels and that their capabilities within the web app will be different based upon their point level. Question: How can this best be implemented? How can it be implemented in a way that is un-hackable (i.e. accessing capabilities that should not be available)? I figure there are two ways to do this: server-side and client-side. For the server-side solution, for each page request you check who the user is and have the CGI rewrite the page so that the client only gets a web page with the intended capabilities. For the client-side solution, the server gives the client the fully capable app and it is the client's job to check the point level and to handicap the app appropriately. It seems like the client-side solution would be easier on the server, (which is really important for my app), but more susceptible to someone hacking and using capabilities unwarranted by their point level.

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  • Website not opening in Chrome?

    - by jitendra
    One of my friend's site's users getting this error. Oops! This link appears to be broken in Google Chrome http://www.labnol.org/software/webpages-not-opening-in-google-chrome/13041/ Can he do something with their hosting to ensure users of his site will not get this error.

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