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  • Why are PHP function signatures so inconsistent?

    - by Shamim Hafiz
    I was going through some PHP functions and I could not help notice the following: <?php function foo(&$var) { } foo($a); // $a is "created" and assigned to null $b = array(); foo($b['b']); var_dump(array_key_exists('b', $b)); // bool(true) $c = new StdClass; foo($c->d); var_dump(property_exists($c, 'd')); // bool(true) ?> Notice the array_key_exists() and property_exists() function. In the first one, the property name(key for an array) is the first parameter while in the second one it is the second parameter. By intuition, one would expect them to have similar signature. This can lead to confusion and the development time may be wasted by making corrections of this type. Shouldn't PHP, or any language for that matter, consider making the signatures of related functions consistent?

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  • Question about Target parameter of Matrix.CreateLookAt

    - by manning18
    I have a newbie question that's causing me a little bit of confusion when experimenting with cameras and reading other peoples implementations - does this parameter represent a point or a vector? In some examples I've seen people treat it like a specific point they are looking at (eg a position in the world), other times I see people caching the orientation of the camera in a rotation matrix and simply using the Matrix.Forward property as the "target", and other times it's a vector that's the result of targetPos - camPos and also I saw a camPos + orientation.Forward I was also just playing around with hard-coded target positions with same direction eg 1 to 10000 with no discernible difference in what I saw in the scene. Is the "Target" parameter actually a position or a direction (irrespective of magnitude)? Are there any subtle differences in behaviors, common mistakes or gotchas that are associated with what values you provide, or HOW you provide this paramter? Are all the methods I mentioned above equivalent? (sorry, I've only recently started and my math is still catching up)

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  • Open source level editor for HTML5 platform game?

    - by Lai Yu-Hsuan
    A natty GUI editor is very helpful to create level map. I want to use some open-source choices rather than build my own from scratch. I found Tiled Map Editor but it doesn't work for what I want. Though I'm building HTML5 game, I don't have to use a HTML5 level editor as long as it can output well-formatted map files which my javascript can read. Edit: Sorry for the confusion. Tiled does not work for me because to make the player perform a 'tricky' jump, sometimes I want to set the distance between two platforms to, say, 7/3 or 8/3 tiles. But in Tiled I get only 2 or 3. If Tiled can do this, please teach me.

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  • What is the *correct* term for a program that makes use of multiple hardware processor cores?

    - by Ryan Thompson
    I want to say that my program is capable of splitting some work across multiple CPU cores on a single system. What is the simple term for this? It's not multi-threaded, because that doesn't automatically imply that the threads run in parallel. It's not multi-process, because multiprocessing seems to be a property of a computer system, not a program. "capable of parallel operation" seems too wordy, and with all the confusion of terminology, I'm not even sure if it's accurate. So is there a simple term for this?

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  • Setup Convergence Address Book DisplayName Lookup

    - by user13332755
    At Convergence Address Book the default lookup for 'Display Name' is the LDAP attribute 'cn', which leads into confusion if you start to setup 'displayName' LDAP attributes for your users. LDAP User Entry with diaplyName attribute: This behavior can be controlled by the configuration file xlate-inetorgperson.xml. Change the default value of XPATH abperson\entry\displayname from 'cn' to 'displayName'. <convergence_deploy_location>/config/templates/ab/corp-dir/xlate-inetorgperson.xml Note: In case the user has no 'displayName' attribute in LDAP you might noticed '...' at the user entry, if found via 'mail' attribute.

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  • Dell whitepaper on PowerEdge R810 R910 and M910 Memory Architecture

    - by jchang
    The Dell PowerEdge 11 th Generation Servers: R810, R910 and M910 Memory Guidance whitepaper seems to have caused some confusion. I believe the source is an error in the paper. In the section on FlexMem Bridge Technology, the Dell whitepaper says this applies to the R810 and the M910. The Dell M910 is a 4-way blade server for the Xeon 7500 series processor line. First a breif recap. The R810 is a 2-way server, by which I mean it has two sockets regardless of the number of cores on each processor....(read more)

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  • Environment naming standards in software development?

    - by Marcus_33
    My project is currently suffering from environment naming issues. Different people have different assumptions as to what environments should be named or what the names designate, and it's causing confusion when discussing them. I've done a bit of research and I haven't found any standards out there. The terms include "Local", "Sand", "Dev", "Test", "User", "QA", "Staging" and "Prod" (plus a few more that different people have asked about) I'm not looking for just opinions, though if there's one out there that "everyone" has I'll take it - I'm trying to find definitions advanced by some sort of authority, even if it's unofficial. Here's the environments we currently use: Environment on the developer's PC Shared Environment where developers directly upload code to self-test Shared Environment where standards and functionality are tested by QA people Shared Environment where completed and QA-checked code is approved by project requesters Environment that mirrors the final environment as a final check and to prepare for deployment Final Environment where code is in use I know what I'd call them, but is there some sort of standard on this? Thanks in advance.

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  • Mod_rewrite and urls that don't end with .php

    - by Kevin Laity
    I'm trying to use Mod_rewrite to hide the .php extensions of my pages. However, it refuses to do any rewriting unless the input url ends with .php, which makes that impossible. I can confirm that rewriting works fine as long as the url has .php at the end. RewriteRule a\.php b\.php Works, while RewriteRule a\.html b\.html does not. How can I turn off this behavior and allow it to rewrite all urls? I'm on a shared host so whatever I do has to be done from a .htaccess file. Update: There seems to be some confusion about what I'm asking here. The question is not about how to write the rule, the question is about server configuration. The rule I'm using is fine, I can test that locally. But the server I'm working with is somehow configured so that mod_rewrite doesn't attempt to rewrite anything that doesn't end with .php

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  • Why some user functions don't get recognised by bash?

    - by strapakowsky
    I can define a function like: myfunction () { ls -R "$1" ; } And then myfunction . just works. But if I do echo "myfunction ." | sh echo "myfunction ." | bash the messages are: sh: myfunction: not found bash: line 1: myfunction: command not found Why? And how can I call a function that comes from a string if not by piping it to sh or bash? I know there is this command source, but I am confused of when I should use source and when sh or bash. Also, I cannot pipe through source. To add to confusion, there is this command . that seems to have nothing to do with the "." that means "current directory".

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  • Hands-On Course Requirement: Applicability

    - by Paul Sorensen
    Hi Everyone,Recently there has been some confusion regarding the need for partner-related candidates to meet the hands-on course requirement for tracks that require it. I thought it would be wise to clarify this point on the blog. A recurring question that we have been getting is:Question: Do partner candidates need to meet a hands-on course requirement?Answer: Yes. In order for a person to become certified they must meet the certification requirements for the track that they are pursuing (as listed on the Oracle certification web site). Regardless of candidate type - partner, customer, employee, etc. - all of the certification requirements for a track must be met. Partner-related certification candidates must therefore meet the hands-on course requirement if the track requires it (i.e. they are not exempt from any of the requirements for any given certification).Thanks!QUICK LINKSOracle certification web siteHands-on Course Attendance Requirements

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  • C++ simple arrays and pointers question

    - by nashmaniac
    So here's the confusion, let's say I declare an array of characters char name[3] = "Sam"; and then I declare another array but this time using pointers char * name = "Sam"; What's the difference between the two? I mean they work the same way in a program. Also how does the latter store the size of the stuff that someone puts in it, in this case 3 characters? Also how is it different from char * name = new char[3]; If those three are different where should they be used I mean in what circumstances?

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  • How should programmers handle identity theft?

    - by Craige
    I recently signed up for an iTunes account, and found that somebody had fraudulently used MY email to register their iTunes account. Why Apple did not validate the email address, I will never know. Now I am told that I cannot use my email address to register a new iTunes account, as this email address is linked to an existing account. This got me thinking, as developers, database administrators, technical analysts, and everything in between, how should we handle reports of a fraud account? Experience teaches us never to re-assign identifying credentials. This can break things and/or cause mass confusion, especially in the realm of the web. That is, if we are are needing to reassign an identifying user credential we can very likely break a users bookmark by making a page render data that previously did not exist at that location. So if we have been taught not to re-assign details like these, how should we handle such a case where an account is discovered to be a fraud and the owner of the identity (e-mail or user name) wishes to claim this detail for their account?

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  • Firefox 4 : pas de 13ème beta, le problème lié à Hotmail est résolu

    Firefox 4 : pas de 13ème beta Le problème lié à Hotmail est résolu Mise à jour du 25/02/11 Contrairement à ce que l'équipe de développement de Firefox avait laissé entendre, il n'y aura pas de 13ème beta pour Firefox 4. Christian Legnitto (Release Manager de Firefox), vient de publier une précision importante : « La beta 12 de Firefox 4 est la dernière prévue. Le fait que les nightly builds (NDR : versions de développement les plus récentes compiléee chaque soir) après la 12ème beta soit nommées 2.0b13 peut être source de confusion. Mais le nom des versions est automatisé. Cela ne signifie PAS que nous sortirons une 13ème bêta ». ...

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  • Mod_rewrite and urls that don't end with .php

    - by Kevin Laity
    I'm trying to use Mod_rewrite to hide the .php extensions of my pages. However, it refuses to do any rewriting unless the input url ends with .php, which makes that impossible. I can confirm that rewriting works fine as long as the url has .php at the end. RewriteRule a\.php b\.php Works, while RewriteRule a\.html b\.html does not. How can I turn off this behavior and allow it to rewrite all urls? I'm on a shared host so whatever I do has to be done from a .htaccess file. Update: There seems to be some confusion about what I'm asking here. The question is not about how to write the rule, the question is about server configuration. The rule I'm using is fine, I can test that locally. But the server I'm working with is somehow configured so that mod_rewrite doesn't attempt to rewrite anything that doesn't end with .php

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  • How do I simplify terrain with tunnels or overhangs?

    - by KKlouzal
    I'm attempting to store vertex data in a quadtree with C++, such that far-away vertices can be combined to simplify the object and speed up rendering. This works well with a reasonably flat mesh, but what about terrain with overhangs or tunnels? How should I represent such a mesh in a quadtree? After the initial generation, each mesh is roughly 130,000 polygons and about 300 of these meshes are lined up to create the surface of a planetary body. A fully generated planet is upwards of 10,000,000 polygons before applying any culling to the individual meshes. Therefore, this second optimization is vital for the project. The rest of my confusion focuses around my inexperience with vertex data: How do I properly loop through the vertex data to group them into specific quads? How do I conclude from vertex data what a quad's maximum size should be? How many quads should the quadtree include?

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  • When creating a new text file, should I add a .txt extension to its name?

    - by Agmenor
    When I create a new document aimed at containing only plain text, I am not obliged by Ubuntu to add a .txt extension to its name. It works indeed very well: gedit opens it without problem, understanding very well that it is only text. The only two pro arguments I have found from now on for adding an extension are 1/ interoperability with Windows systems and 2/ avoiding confusion with folders having the same name. Nevertheless those two arguments do not convince me at all. As a consequence, should I keep the reflex of adding an extension to files or not?

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  • what does composition example vs aggregation

    - by meWantToLearn
    Composition and aggregation both are confusion to me. Does my code sample below indicate composition or aggregation? class A { public static function getData($id) { //something } public static function checkUrl($url) { // something } class B { public function executePatch() { $data = A::getData(12); } public function readUrl() { $url = A::checkUrl('http/erere.com'); } public function storeData() { //something not related to class A at all } } } Is class B a composition of class A or is it aggregation of class A? Does composition purely mean that if class A gets deleted class B does not works at all and aggregation if class A gets deleted methods in class B that do not use class A will work?

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  • Should data structures be integrated into the language (as in Python) or be provided in the standard library (as in Java)?

    - by Anto
    In Python, and most likely many other programming languages, common data structures can be found as an integrated part of the core language with their own dedicated syntax. If we put LISP's integrated list syntax aside, I can't think of any other languages that I know which provides some kind of data structure above the array as an integrated part of their syntax, though all of them (but C, I guess) seem to provide them in the standard library. From a language design perspective, what are your opinions on having a specific syntax for data structures in the core language? Is it a good idea, and does the purpose of the language (etc.) change how good this could be of a choice? Edit: I'm sorry for (apparently) causing some confusion about which data structures I mean. I talk about the basic and commonly used ones, but still not the most basic ones. This excludes trees (too complex, uncommon), stacks (too seldom used), arrays (too simple) but includes e.g. sets, lists and hashmaps.

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  • jQuery modifie ses licences et ne garde que la licence MIT

    jQuery modifie ses licences et ne garde que la licence MIT. La fondation jQuery a décidé de modifier sa gestion de licence. Elle abandonne la licence GNU General Public pour ne garder que la licence MIT. Cela lui permet d'éliminer la confusion qui existait sur la politique de double licence. Du côté des utilisateurs, ça ne change pas grand chose. L'utilisateur reste libre d'utiliser des projets de la fondation, de les modifier et même de les repasser en licence GPL si ça l'enchante. Effectivement, la licence MIT est tout à fait compatible avec licence GNU GPL. Il faut savoir qu'il y a plus de 500 personnes qui ont contribués aux projets jQuery. La fondation souhaite q...

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  • is a merchant account a requirment for a website to take payments..

    - by calum
    Hi, I have had a quick look but couldn't see anything related. Basically, if we were to accept payments for events on our website, via paypal (essentially a Buy it now! button), as a business, do we need a merchant's account, or will a regular bank account be acceptable? I may have some confusion in terms. My understanding is you need a merchant's account to accept credit card payments, but as we are using PayPal, is this necessary? Thank you for any clarification. disclaimer - I've read What are some options for taking payments on my website? but it doesn't explicitly say if we require a merchant account or not. Thank you.

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  • Making Class Diagram for MVC Pattern Project

    - by iMohammad
    I have a question about making a class diagram for an MVC based college senior project. If we have 2 actors of users in my system, lets say Undergrad and Graduate students are the children of abstract class called User. (Generalisation) Each actor has his own features. My question, in such case, do we need to have these two actors in separate classes which inherits from the abstract class User? even though, I'm going to implement them as roles using one Model called User Model ? I think you can see my confusion here. I code using MVC pattern, but I've never made a class diagram for this pattern. Thank you in advance!

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  • Why does a proportional controller have a steady state error?

    - by Qantas 94 Heavy
    I've read about feedback loops, how much this steady state error is for a given gain and what to do to remove this steady state error (add integral and/or derivative gains to the controller), but I don't understand at all why this steady state error occurs in the first place. If I understand how a proportional control works correctly, the output is equal to the current output plus the error, multiplied by the proportional gain (Kp). However, wouldn't the error slowly diminish over time as it is added (reaching 0 at infinite time), not have a steady state error? From my confusion, it seems I'm completely misunderstanding how it works - a proper explanation of how this steady state error eventuates would be fantastic.

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  • How do I make my volume indicator operate in decibels instead of percentage?

    - by ethana2
    When I want to adjust the volume of anything I'm doing, I find that using the volume controls built into Ubuntu is little but confusion. When the volume is around 100%, dropping it several increments has almost no effect on apparent volume, but when it's around 0%, the effect of one click of my mouse wheel is probably a good 3 decibels. I have observed this behavior on tens of different UC's, since I convert about one Ubuntu user a month (NE team contact). This has proven so frustrating to me that I tend to use the volume knob on my guitar amp ( mono audio :| ) instead of the volume indicator. What can I do to make my volume indicator behave properly until this is fixed? I want each volume increment to be one half or one third decibel. Is there a different piece of software I should use for system volume configuration perhaps?

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  • is a merchant account a requirment for a website to take payments

    - by calum
    I have had a quick look but couldn't see anything related. Basically, if we were to accept payments for events on our website, via paypal (essentially a Buy it now! button), as a business, do we need a merchant's account, or will a regular bank account be acceptable? I may have some confusion in terms. My understanding is you need a merchant's account to accept credit card payments, but as we are using PayPal, is this necessary? Thank you for any clarification. disclaimer - I've read What are some options for taking payments on my website? but it doesn't explicitly say if we require a merchant account or not. Thank you.

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  • What grammatical tense should I write my specifications in?

    - by John
    We are currently writing functional and technical specifications in a two column format; summary sentence and technical detail. The details often refer to an appendix with diagrams, layout designs ect. However I am struggling with what tense to write it in: With past tense as if the work is done I struggle to show highlight extensions of exiting work. Future tense as in it needs to do X starts to sound like a to do list or Tense neutral very hard as it has either going to be done or is done. To add further confusion this specification may be read by people who do not have English as a first language.

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