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• Is it bad practice to use <?= tag in PHP

  - by marco-fiset

  I've come across this PHP tag <?= ?> recently and I am reluctant to use it, but it itches so hard that I wanted to have your take on it. I know it is bad practice to use short tags <? ?> and that we should use full tags <?php ?> instead, but what about this one : <?= ?>? It would save some typing and it would be better for code readability, IMO. So instead of this: <input name="someVar" value="<?php echo $someVar; ?>"> I could write it like this, which is cleaner : <input name="someVar" value="<?= $someVar ?>"> Is using this operator frowned upon?

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• Solaris 11 Technology Forums, NYC and Boston

  - by dminer

  By now you're certainly aware that we released Solaris 11; I was on vacation during the launch so haven't had time to write any material related to the Solaris 11 installers, but will get to that soon.  Following onto the release, we're scheduling events in various locations around the world to talk about some of the key new features in Solaris 11 in more depth.  In the northeast US, we've scheduled technology forums in New York City on November 29, and Burlington, MA on November 30.  Click on those links to go to the detailed info and registration.  I'll be one of the speakers at both of them, so hope to see you there!

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• What is the worst programmer habit?

  - by 0x4a6f4672

  Many people get into programming because programming is fun. At least in the beginning. After some time doing it professionally, programming is no longer fun, often just hard work. Sometimes we develop bad habits along the way to make it fun again. Some bad habits of programmers are well known, for example the "I fix that in a second" habit, the "reinvent the wheel" practice or the "all code except mine is crap" attitude (which often leads to "I will re-write the entire program from scratch" syndrome). There are things which a programmer should never do. What is the worst programmer habit?

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• Bonnie does not provide speed for Sequential Input / Block

  - by Lqp1

  I'm using ProxmoxVE and I would like to run some benchmarks regarding performances of this product. One of these benchmarks is bonnie++ ; it runs very well in a VM (qemu-kvm) but when I run it in a conainer (openVZ), it does not provide me reading speed (only writing). I don't understand why... Does anyone know what's happenning ? VMs ans Containers are Debian 7.4. Here's the output of bonnie in the container: root@ct2:/# bonnie++ -u root Using uid:0, gid:0. Writing a byte at a time...done Writing intelligently...done Rewriting...done Reading a byte at a time...done Reading intelligently...done start 'em...done...done...done...done...done... Create files in sequential order...done. Stat files in sequential order...done. Delete files in sequential order...done. Create files in random order...done. Stat files in random order...done. Delete files in random order...done. Version 1.96 ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP ct2 1G 843 99 59116 8 60351 4 4966 99 +++++ +++ 2745 8 Latency 9558us 3582ms 527ms 1672us 936us 5248us Version 1.96 ------Sequential Create------ --------Random Create-------- ct2 -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ Latency 19567us 358us 368us 107us 59us 25us 1.96,1.96,ct2,1,1401810323,1G,,843,99,59116,8,60351,4,4966,99,+++++,+++,2745,8,16,,,,,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,9558us,3582ms,527ms,1672us,936us,5248us,19567us,358us,368us,107us,59us,25us The filesystem for / is of type "simfs", which is a pseudo filesystem for openVZ. Maybe it's related to this issue but I can't find anyone with the same issue with bonnie and openVZ... Thanks for your help. Regards, Thomas.

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• How to convert mkv to dvd or avi

  - by nathanvda

  I have some mkv files, and while Totem plays them perfectly, when i use Devede to burn them to dvd it all gets messed up: the video is ok, but the audio is out of sync. I did see that Devede does write my dixv avi files correctly to disk. So i am thinking what the best way could be to convert my mkv for playback on dvd? I was thinking maybe converting them to avi first? But i did not find a good way for that to happen. What do you suggest?

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• Kernel panic when booting from USB

  - by maaartinus

  I downloaded ubuntu-11.04-desktop-amd64.iso and used Universal-USB-Installer-1.8.6.3.exe to format my USB stick und put the ISO on it. When I tried to install from it, I've got a kernel panic just like here, except for the version number (mine was 2.6.38-8-generic #42-ubuntu). My ISO image seems to work, as I installed it into a VMWare player without problems. Booting Linux from USB works surely too, as I did it some time ago with an older Ubuntu version. I can imagine things to try out, e.g., write the image again, try another version, pray, look for patches, etc. However, I'm looking for a time-efficient solution, something what most probably works. An advice of the sort "wait two weeks until it's surely fixed, then download again" is acceptable, I'm determined to switch to Linux, but it can wait a bit.

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• What to choose for beginner: PHP/Python/Ruby

  - by Nai

  I'm a beginner teaching myself to code but I would like he insight of the PSE community and helping choose where to start. My main objective is to be able to create a basic website to first test my business idea and from there iterate on it quickly to minimise my learning time. The most important criteria for me is speed. An example of speed would be pre-built components available open source and not having to write one from scratch. From my research, this seems to be a death match between the following languages and frameworks: PHP and CakePHP Python and Django Ruby and Rails Assumptions: I am going to be equally good (or bad) in all 3. It is going to be equally easy to find competent developers in either language. I know this to be false already by lets assume that it is. This question is not meant to karma whore as I've seen how passionate some of these standoff questions have been and I'll be happy to turn it into a community wiki.

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• Long running calculation on background thread

  - by SundayMonday

  In my Cocos2D game for iOS I have a relatively long running calculation that happens at a fairly regular interval (every 1-2 seconds). I'd like to run the calculation on a background thread so the main thread can keep the animation smooth. The calculation is done on a grid. Average grid size is about 100x100 where each cell stores an integer. Should I copy this grid when I pass it to the background thread? Or can I pass a reference and just make sure I don't write to the grid from the main thread before the background thread is done? Copying seems a bit wasteful but passing a reference seems risky. So I thought I'd ask.

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• Webcast Replay: Extreme Performance for Consolidated Workloads with Oracle Exadata

  - by kimberly.billings

  If you missed our live webcast Extreme Performance for Consolidated Workloads with Oracle Exadata last week, the replay is now available. Watch the free on-demand webcast in which Tim Shetler, Vice President of Oracle Database Product Management, and Richard Exley, Consulting Member of Technical Staff, discuss how Oracle Exadata can help you can significantly improve application performance and reduce infrastructure costs by consolidating transaction processing, data warehousing, or mixed workloads on Oracle Exadata. Note: (1) Turn off pop-up blockers if the slides do not advance automatically. (2) Slides are available for download. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• Generating Wrappers for REST APIs

  - by Kyle

  Would it be feasible to generate wrappers for REST APIs? An earlier question asked about machine readable descriptions of RESTful services addressed how we could write (and then read) API specifications in a standardized way which would lend itself well to generated wrappers. Could a first pass parser generate a decent wrapper that human intervention could fix up? Perhaps the first pass wouldn't be consistent, but would remove a lot of the grunt work and make it easy to flesh out the rest of the API and types. What would need to be considered? What's stopping people from doing this? Has it already been done and my google fu is weak for the day?

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• Cannot Install mysql-query-browser in Ubuntu 12.04

  - by doy

  Please help..... I tried to install mysql-query-browser in my Ubuntu 12.04 GUI, I get the error message: Updating mysql-administrator installation paths... ./mysql-administrator: 59: ./mysql-administrator: cannot create /opt/mysql-gui-tools-5.0/lib/pangorc.bak: Permission denied Error updating files for new installation path. Please make sure mysql-administrator is installed correctly and you have proper write permissions in the installation directory. Tried the ..... /opt/mysql-gui-tools-5.0$ ./mysql-administrator --update-paths . and /opt/mysql-gui-tools-5.0$ ./mysql-administrator --update-paths but still no success.........

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• What web oriented language would work best with binary data?

  - by Qqwy

  I want to create a service where people can upload files. However, since file storage costs money, I want to compress the files so they take less space. I would want to write my own compression algorithm, however, PHP doesn't have good ways to handle binary data (which is needed for many compression algorithms). So I wondered, what would be a better language to create such a website in? I have knowledge of PHP (and Javascript, HTML and CSS) but no experience with other things like Ruby, Perl, Python, and other web development languages.

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• Database for Ubuntu

  - by Toby J

  I am trying Ubuntu 12.04 booted from a DVD disk before I install it. I currently havwe windows 8 (which I hate) and I have a couple of Data base programs with my movies, hundreds of movies, in them. Is there a database available for Ubuntu that is compatible with Microsoft Database? There are too much data in the current database file for me to have to rewrite the program. So far, I love the Ubuntu 12.04. I have been able to access my microsoft works spreadsheet files and documents with no problem. And I like the thuderbird email and just about everything else about Ubuntu 12.04. I just need to be able to access my database files and to write lables and envelopes. Thanks. Toby J Paris, TN

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• Unity: Assigning String value in inspector

  - by Marc Pilgaard

  I got an issue with Unity I can't seem to comprehend, and it is possibly very simple: I am trying to write a simple piece of code in JavaScript where a button toggles the activation of a shield, by dragging a prefab with Resources.load("ActivateShieldPreFab") and destroying it again (Haven't implemented that yet). I wish to assign this button through the inspector, so I have created a string variable which appears as intended in the inspector. Though it doesn't seem to register the inspector input, even though I changed the value through the inspector. It only provides the error: "Input Key named: is unknown" When the button name is assigned within the code, there is no issues. Code as follows: var ShieldOn = false; var stringbutton : String; function Start(){ } function Update () { if(Input.GetKey(stringbutton) && ShieldOn != true) { Instantiate(Resources.load("ActivateShieldPreFab"), Vector3 (0, 0, 0), Quaternion.identity); ShieldOn = true; } } Hope somebody can help, in advance... Thanks

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• Where to hire a scenario writer for a small interactive story game?

  - by Alexander Gladysh

  I need a scenario for a small dialog-based game / interactive story. The game would be used as an example for a middleware tool we're developing. I would like to buy an existing story (it should be dynamic of course — with branching dialogs etc.), or hire someone to write a new one. Please advise, where to go to find such person / service? We're based in Russia, so getting a talented enough native English writer locally is a bit of a problem. Update: To be extra clear: We must get all necessary rights to reuse the story and make a derived work (i.e. the game we're talking about) from it. This is a commercial product. Borrowing someone else's work at random and using it just not going to work.

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• How are Programming Languages Designed?

  - by RectangleTangle

  After doing a bit of programming, I've become quite curious on language design itself. I'm still a novice (I've been doing it for about a year), so the majority of my code pertains to only two fields (GUI design in Python and basic algorithms in C/C++). I have become intrigued with how the actual languages themselves are written. I mean this in both senses. Such as how it was literally written (ie, what language the language was written in). As well as various features like white spacing (Python) or object orientation (C++ and Python). Where would one start learning how to write a language? What are some of the fundamentals of language design, things that would make it a "complete" language?

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• LightScythe Creates Huge Light Paintings

  - by Jason Fitzpatrick

  Earlier this year we showed you how an LED POV staff could be used to visualize network data. This build takes it to another level and allows you to imprint entire words and images into photos. Gavin, a hardware hacker from Sydney, built an open-source POV (persistence of vision) staff after the Wi-Fi visualizer inspired him to begin playing with large POV builds. He built his POV staff using LED strips, wireless controllers, and a laptop to send the signals at the proper intervals to the staff. He can write words, create images, and even send Pac-Man racing across the frame. Hit up the link below to read more about his project and grab his schematics and parts lists. LightScythe [The Mechatronics Guy via Make] HTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)What is a Histogram, and How Can I Use it to Improve My Photos?

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• Public versus private inheritance when some of the parent's methods need to be exposed?

  - by Vorac

  Public inheritance means that all fields from the base class retain their declared visibility, while private means that they are forced to 'private' within the derived class's scope. What should be done if some of the parent's members (say, methods) need to be publicly exposed? I can think of two solution. Public inheritance somewhat breaks encapsulation. Furthermore, when you need to find out where is the method foo() defined, one needs to look at a chain of base classes. Private inheritance solves these problems, but introduces burden to write wrappers (more text). Which might be a good thing in the line of verbosity, but makes changes of interfaces incredibly cumbersome. What considerations am I missing? What constraints on the type of project are important? How to choose between the two (I am not even mentioning 'protected')? Note that I am targeting non-virtual methods. There isn't such a discussion for virtual methods (or is there).

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• What is the concept behind writing a cancel operation in c++?

  - by ToMan

  I'm attempting to write a cancel operation for a software download application. This application will first transfer the software to the device and then install the software on it. (These are givens I'm not allowed to change). What should the cancel operation do? When a user presses 'cancel', the application should stop transferring/installing the software immediately. Question: Since I've never written a "cancel" function, I'm wondering what are the types of things to consider when writing the code, and what are the common bugs I should expect and how to deal with them? Couldn't find anything in google so if you have some links that would be good reads I'd really appreciate it since I'm not looking for answers I'm just looking for guidelines/macro/concept help

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• Weird Apache behaviour and with files again

  - by afifio

  Hi and thanks for stopping by. I have read Weird Apache problem with file, I have read Weird Apache problem with file ...and its not the problem Setup single XAMPP installation on Windows, single windows user, 2HD, 1 is a portable USB. All is fine, until I move the xampp to new portable HD Symptom Old php files - works fine, new one doesnt http://127.0.0.1/Ajax/index.php - yay http://127.0.0.1/test2/t.php - display the source code http://127.0.0.1/Ajax/test2/t.php - display the source code http://127.0.0.1/Ajax/t.php - display the source code Extra Info IIS+MS Web Development stuff, .NET4, Asp, etc is being installed and still hast reboot yet. .htaccess also seems doesnt work Apache2 conf file was modified to Averride All and still it doesnt care. One of the directory supposed to treat .htm as php yet got text, created another directory and edit a phpinfo, still another text, browse to phpmyadmin, viola, works fine Suspect Does Apache honour XP security and permission ? If so, this is a single user computer. Does Apache dont like my new hard disk/new place ? Why it doesnt execute the php in new directory but happily execute in old folder ? Thanks for the riddle answers

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• Can WebGL be used to create a tile-based multi-layer scrolling platform game?

  - by Nicholas Hill

  I've found WebGL (based on OpenGL) to be a fiendish and unforgiving framework for those learning to write HTML5-based games. Despite the presence of many examples on how to get started, I'm really struggling to understand how I could simply load a bunch of images and render them to a canvas quickly using WebGL. My specific scenario involves trying to render a map using a bespoke but simple multi-layered tile engine, where each value in a three dimensional array points to the image to use for that location in the rendered image. Think "Sonic the Hedgehog" via tilesets, tiles, maps, layers, sprites etc. Can anyone enlighten me: 1) How can I load an image that I can use as a texture in WebGL? 2) How can I dynamically select an image at run time and draw it at any co-ordinate, that I also select at run time?

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• How Is there anyway to Compile Notepad++?

  - by user44179

  I really like using Notepad++ to write HTML and such. After I started using Ubuntu I looked around for an alternative to Notpad++. I found a thread which lead me to try Geany and a few others, but I really miss Notepad++. Is there anyway I could compile it from the source code to use on Ubuntu? I know its written in C++. Could I just open it in Code::Blocks and compile it? You can get the source here. I wouldn't mind hearing about other alternatives, but really want to know if compiling it is possible. Thanks

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• how to fix error when authenticating in U1

  - by Yann

  Like other users, when authenticating in U1 I get this error: Method "CreateItem" with signature "a{sv}(oayay)b" on interface "org.freedesktop.Secret.Collection" doesn't exist. And in /var/log/auth.log: gnome-keyring-daemon[4793]: egg_symkey_generate_simple: assertion `iterations >= 1' failed gnome-keyring-daemon[4793]: couldn't prepare to write out keyring: /home/yann/.gnome2/keyrings/login_1.keyring So I tried to move "login.keyring". I typed no password for the security when logging into U1, accepted non secured way to save passwords. And a message told me the operation successfully completed (in French). But, sync did not work. And u1sdtool --status returned this: State: AUTH_FAILED connection: With User With Network description: auth failed is_connected: False is_error: True is_online: False queues: WORKING I'm sorry U1 doesn't work anymore; it was really useful to me. Can you help me ? Ubuntu 11.10

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• How file permissions are stored in inode?

  - by Debadyuti Maiti

  Suppose there's two pc - "A" and "B". Then if A downloads a files from B , then what would be the file permission of that downloaded file? Is it possible that the downloaded file in A will have an Inode entry with all it's permissions from B & store B's user account as the owner ? If that's the case then is it impossible to change that files permission on A if "others" [as in user-group-others] doesn't have the right to write on that file? e.g. if this is the case , __x __x __x file.txt [On B] then what would be the file permission on A of that same file downloaded from B [e.g. through vsftpd]? __x __x __x file.txt [On A] or rw_x rw_x rw_x file.txt [On A] [i.e. defined by A's default umask value]

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• what is the purpose of arrows?

  - by Simon

  I am learning functionnal programming with Haskell, and I try to grab concepts by first understanding why do I need them. I would like to know the goal of arrows in functional programming languages. What problem do they solve? I checked http://en.wikibooks.org/wiki/Haskell/Understanding_arrows and http://www.cse.chalmers.se/~rjmh/afp-arrows.pdf. All I understand is that they are used to describe graphs for computations, and that they allow easier point free style coding. The article assume that point free style is generally easier to understand and to write. This seems quite subjective to me. In another article (http://en.wikibooks.org/wiki/Haskell/StephensArrowTutorial#Hangman:_Main_program), a hangman game is implemented, but I cannot see how arrows makes this implementation natural. I could find a lot of papers describing the concept, but nothing about the motivation. What I am missing?

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