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  • Session Tracking - Advantages and Disadvantages

    I use to work for a major internet company that sold Dental Plans to customers through their large customer-driven websiteto consumers. They start tracking their users as soon as they hit their web servers, and then they log everything they can about the user. There are a lot of benefits for using session tracking for both the user and the website. Users can benefit from session tracking due to the fact that a website can retain pertaining information for the user so that they do not have to re-enter the same information repeatedly. In addition, websites can hold specific items in a cart for each user so that they can pay for all of their  items at once when they are ready to complete their purchases. Websites can also benefit from session tracking because they can determine where a specific user came from and which advertising partner gave them a sale. This information is very useful when deciding on where to spend an advertising budget. There is only one real disadvantage when it comes to session tracking, Users can not really control what is actually tracked by a website. Yes, they can disable cookies and this will help, but that means that no tracking can be done at all. Most sites require users to have cookies enabled in order for users to make purchases or login to their accounts.  

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  • Web development - relative URLs without duplicating files

    - by eshriek
    I have a site with index.php in the root folder, images in /img , and overview.php in /content . I have a sidebar.php file that is included in both index.php and overview.php . How should I refer to /img/image.gif if I include a link in each file? The location of image.gif changes relative to the location of the file that references it. Using /img/image.gif in sidebar.php will work in index.php, but it fails for the file located at /content/overview.php. The only solution that I can see is to either include a seperate sidebar.php in each subdirectory, or include an /img directory in every sub-directory. The best suggestion that I can find is to use the <base html tag as suggested here: Change relative link paths for included content in PHP However, in the same link, SamGoody suggests that the <base tag "is no longer properly supported in Internet Explorer, since version 7." I'd like some insight on the matter before committing to a course of action. Thanks. EDIT: I am using the wrong approach below with "../" Example- root/index.php: ... <link rel="stylesheet" type="text/css" href="style.css" /> <title>title</title> </head> <body> <?php include('include/header.php'); ?> <?php include('include/menu.php'); ?> ... root/include/header.php: ... <div id="header"> <span class="fl"><img src="img/dun1.png"/></span><span class="fr"><img src="img/dun2.png"/></span> ... root/content/overview.php: ... <link rel="stylesheet" type="text/css" href="../style.css" media="screen" /> <title>Overview</title> </head> <body> <?php include('../include/header.php'); ?> <?php include('../include/menu.php'); ?> ...

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  • Users can benefit from Session Tracking

    I use to work for a large Dental Plan marketing website a few years ago and they had a large customer-driven website that sold Dental Plans to consumers. Their website started tracking users as soon as they hit their web servers, and then they logged everything they could about the user. There are a lot of benefits for using session tracking for both the user and the website. Users can benefit from session tracking due to the fact that a website can retain pertaining information for the user so that they do not have to re-enter the same information repeatedly. In addition, websites can hold specific items in a cart for each user so that they can pay for all of their  items at once when they are ready to complete their purchases. Websites can also benefit from session tracking because they can determine where a specific user came from and which advertising partner gave them a sale. This information is very useful when deciding on where to spend an advertising budget. There is only one real disadvantage when it comes to session tracking, Users can not really control what is actually tracked by a website. Yes, they can disable cookies and this will help, but that means that no tracking can be done at all. Most sites require users to have cookies enabled in order for users to make purchases or login to their accounts.

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  • [NHibernate and ASP.NET MVC] How can I implement a robust session-per-request pattern in my project,

    - by Guillaume Gervais
    I'm currently building an ASP.NET MVC project, with NHibernate as its persistance layer. For now, some functionnalities have been implemented, but only use local NHibernate sessions: each method that accessed the database (read or write) needs to instanciate its own NHibernate session, with the "using()" directive. The problem is that I want to leverage NHibernate's Lazy-Loading capabilities to improve the performance of my project. This implies an open NHibernate session per request until the view is rendered. Furthermore, simultaneous request must be supported (multiple Sessions at the same time). How can I achieve that as cleanly as possible? I searched the Web a little bit and learned about the session-per-request pattern. Most of the implementations I saw used some sort of Http* (HttpContext, etc.) object to store the session. Also, using the Application_BeginRequest/Application_EndRequest functions is complicated, since they get fired for each HTTP request (aspx files, css files, js files, etc.), when I only want to instanciate a session once per request. The concern that I have is that I don't want my views or controllers to have access to NHibernate sessions (or, more generally, NHibernate namespaces and code). That means that I do not want to handle sessions at the controller level nor the view one. I have a few options in mind. Which one seems the best ? Use interceptors (like in GRAILS) that get triggered before and after the controller action. These would open and close sessions/transactions. Is it possible in the ASP.NET MVC world? Use the CurrentSessionContext Singleton provided by NHibernate in a Web context. Using this page as an example, I think this is quite promising, but that still requires filters at the controller level. Use the HttpContext.Current.Items to store the request session. This, coupled with a few lines of code in Global.asax.cs, can easily provide me with a session on the request level. However, it means that dependencies will be injected between NHibernate and my views (HttpContext). Thank you very much!

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  • Long connection times from PHP to MySQL on EC2

    - by Erik Giberti
    I'm having an intermittent issue connecting to a database slave with InnoDB. Intermittently I get connections taking longer than 2 seconds. These servers are hosted on Amazon's EC2. The app server is PHP 5.2/Apache running on Ubuntu. The DB slave is running Percona's XtraDB 5.1 on Ubuntu 9.10. It's using an EBS Raid array for the data storage. We already use skip name resolve and bind to address 0.0.0.0. This is a stub of the PHP code that's failing $tmp = mysqli_init(); $start_time = microtime(true); $tmp-options(MYSQLI_OPT_CONNECT_TIMEOUT, 2); $tmp-real_connect($DB_SERVERS[$server]['server'], $DB_SERVERS[$server]['username'], $DB_SERVERS[$server]['password'], $DB_SERVERS[$server]['schema'], $DB_SERVERS[$server]['port']); if(mysqli_connect_errno()){ $timer = microtime(true) - $start_time; mail($errors_to,'DB connection error',$timer); } There's more than 300Mb available on the DB server for new connections and the server is nowhere near the max allowed (60 of 1,200). Loading on both servers is < 2 on 4 core m1.xlarge instances. Some highlights from the mysql config max_connections = 1200 thread_stack = 512K thread_cache_size = 1024 thread_concurrency = 16 innodb-file-per-table innodb_additional_mem_pool_size = 16M innodb_buffer_pool_size = 13G Any help on tracing the source of the slowdown is appreciated. [EDIT] I have been updating the sysctl values for the network but they don't seem to be fixing the problem. I made the following adjustments on both the database and application servers. net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_sack = 0 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_fin_timeout = 20 net.ipv4.tcp_keepalive_time = 180 net.ipv4.tcp_max_syn_backlog = 1280 net.ipv4.tcp_synack_retries = 1 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 87380 16777216 [EDIT] Per jaimieb's suggestion, I added some tracing and captured the following data using time. This server handles about 51 queries/second at this the time of day. The connection error was raised once (at 13:06:36) during the 3 minute window outlined below. Since there was 1 failure and roughly 9,200 successful connections, I think this isn't going to produce anything meaningful in terms of reporting. Script: date /root/database_server.txt (time mysql -h database_Server -D schema_name -u appuser -p apppassword -e '') /dev/null 2 /root/database_server.txt Results: === Application Server 1 === Mon Feb 22 13:05:01 EST 2010 real 0m0.008s user 0m0.001s sys 0m0.000s Mon Feb 22 13:06:01 EST 2010 real 0m0.007s user 0m0.002s sys 0m0.000s Mon Feb 22 13:07:01 EST 2010 real 0m0.008s user 0m0.000s sys 0m0.001s === Application Server 2 === Mon Feb 22 13:05:01 EST 2010 real 0m0.009s user 0m0.000s sys 0m0.002s Mon Feb 22 13:06:01 EST 2010 real 0m0.009s user 0m0.001s sys 0m0.003s Mon Feb 22 13:07:01 EST 2010 real 0m0.008s user 0m0.000s sys 0m0.001s === Database Server === Mon Feb 22 13:05:01 EST 2010 real 0m0.016s user 0m0.000s sys 0m0.010s Mon Feb 22 13:06:01 EST 2010 real 0m0.006s user 0m0.010s sys 0m0.000s Mon Feb 22 13:07:01 EST 2010 real 0m0.016s user 0m0.000s sys 0m0.010s [EDIT] Per a suggestion received on a LinkedIn question, I tried setting the back_log value higher. We had been running the default value (50) and increased it to 150. We also raised the kernel value /proc/sys/net/core/somaxconn (maximum socket connections) to 256 on both the application and database server from the default 128. We did see some elevation in processor utilization as a result but still received connection timeouts.

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  • As a web designer, which language should I learn first for my feature career? (PHP or JavaScript) [closed]

    - by kdevs3
    Possible Duplicates: Best Programming Language for Web Development How can I choose a web development language? What language will you choose if you are going to build something big? What is the right option of programming languages and tools for building our website? What is the easiest web programing language at....? Well, I'm more of a basic web designer. I know the easy stuff pretty well. (Ya know, html, css) But I've been trying to take it to the next step and I'm contemplating about what I should learn that will help me out the most in my future web design/programming career, should it be JavaScript or maybe I should try to learn a back end programming language such as PHP. Lately, I have been hearing about a lot how JavaScript is so great and useful now, because of libraries such as jQuery and what possibility's it can bring by using Node.js and other frameworks. I've only learned the most basic of JavaScript and used some jQuery (mostly plugins) so i wouldn't know at all of what it can actually do. Would JS being so popular as it is now and useful, be a reason to stick with JavaScript and only learn it that for now? Or as a web designer, how important would it be to learn how to make a web application/website operate and functional, and know how to work with servers, etc? (Such as getting forms to work and sending data to the server and back) I've took a look at frameworks such as Code Igniter before, and looks really simple to get started with if I try to learn PHP, But I'm not sure how important it is for my career and what I would gain out of it. I'm asking because I can't decide what I should learn first. When I select it, I really want to take my time and learn the language. I don't want to spend time on learning multiple languages at the same time, so I need to pick wisely. I'm trying to turn the right direction so my career can hopefully be successful in the feature. (If money/gaining a job asked if its important, then its a yeah, it is a bit) I'm hoping I can get opinions and suggestions on this question, thanks for giving me your thoughts also.

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  • web vs desktop? (php vs c++?)

    - by Dhaivat Pandya
    I need to write a simple file transfer mechanism (that isn't ftp). Firstly, it must have a GUI. Secondly, it must not be dropbox. Third, it may not use any paid libraries, and hopefully, it uses open source components. The question that came to my mind is, where is everyone moving, from desktop to web, or from web to desktop? Would it be more useful to be experienced in say, C++ than in PHP (or vice versa)?

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  • Ideal web application framework for newcomers and whether it is better to use Java or PHP based framework?

    - by Pawan
    My primary question is whether a Java based web application framework is better or a PHP based one and why? Moreover, if I were just starting web development then what would be some ideal frameworks to start with, considering I may want to make a full CMS out of it later? I am not looking for a 'best', rather some good recommendations as I understand that CodeIgnitor has not got a long way to go from here : http://heybigname.com/2012/05/06/why-codeigniter-is-dead/

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  • Are SQL Injection vulnerabilities in a PHP application acceptable if mod_security is enabled?

    - by Austin Smith
    I've been asked to audit a PHP application. No framework, no router, no model. Pure PHP. Few shared functions. HTML, CSS, and JS all mixed together. I've discovered numerous places where SQL injection would be easily possible. There are other problems with the application (XSS vulnerabilities, rampant inline CSS, code copy-pasted everywhere) but this is the biggest. Sometimes they escape inputs, not using a prepared query or even mysql_real_escape_string(), mind you, but using addslashes(). Often, though, their queries look exactly like this (pasted from their code but with columns and variable names changed): $user = mysql_query("select * from profile where profile_id='".$_REQUEST["profile_id"]."'"); The developers in question claimed that they were unable to hack their application. I tried, and found mod_security to be enabled, resulting in HTTP 406 for some obvious SQL injection attacks. I believe there to be sophisticated workarounds for mod_security, but I don't have time to chase them down. They claim that this is a "conceptual" matter and not a "practical" one since the application can't easily be hacked. Their internal auditor agreed that there were problems, but emphasized the conceptual nature of the issues. They also use this conceptual/practical argument to defend against inline CSS and JS, absence of code organization, XSS vulnerabilities, and massive amounts of repetition. My client (rightly so, perhaps) just wants this to go away so they can launch their product. The site works. You can log in, do what you need to do, and things are visibly functional, if slow. SQL Injection would indeed be hard to do, given mod_security. Further, their talk of "conceptual vs. practical" is rhetorically brilliant, considering that my client doesn't understand web application security. I worry that they've succeeded in making me sound like an angry puritan. In many ways, this is a problem of politics, not technology, but I am at a loss. As a developer, I want to tell them to toss the whole project and start over with a new team, but I face a strong defense from the team that built it and a client who really needs to ship their product. Is my position here too harsh? Even if they fix the SQL Injection and XSS problems can I ever endorse the release of an unmaintainable tangle of spaghetti code?

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  • Is there any free host which supports php and mySQL in utf-8? [closed]

    - by Maria Konnou
    Possible Duplicate: How to find web hosting that meets my requirements? Is there any free host which supports php and mySQL queries in utf-8? I've already tried to use x10hosting and 000webhosting, but they don't support utf8 mysql queries (got mojibake). The default encoding of mysql in both sites is latin-1, and you're not able to change that. Is there any other free host that fully supports utf-8?

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  • Is there a Railstutorial-quality tutorial for a PHP framework?

    - by tnorthcutt
    Is there a tutorial along the lines of Michael Hartl's Rails Tutorial for a (widely used) PHP framework? Obviously there are tons of tutorials for e.g. Codeigniter, CakePHP, Symfony, etc., but I haven't been able to find one that is as extensive as Rails Tutorial is. Ideally, I'd like something that takes you from nothing to building a complete, functioning application with at least a decent amount of complexity.

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  • Should I close database connections after use in PHP?

    - by Sprottenwels
    I wonder if I should close any unnecessary database connection inside of my PHP scripts. I am aware of the fact that database connections are closed implicitly when the block stops executing and 'manually' closing the connections could kinda bloat the codebase with unnecessary code. But shouldn't I do so in order to make by code as readable and as easy understandable as possible, while also preventing several possible issues during run time? Also, if I would do, would it be enough to unset() my database object?

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  • can php read node of float number? [on hold]

    - by Suriani Salleh
    my node number is 1.2.3.4 $node= 1.2.3.4 when i run my code as shown below, it print error message but when i try assign $node = abc_def it execute the function code my question is can php read 1.2.3.4? if(!get_node_id($node) === false){ //function code .................................. ..............................} else { // error msg }

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  • Sending emails from PHP - email providers vs GAE

    - by nrph
    I need to send emails from my social service (this is continuation of Experiences in mailing to registered users). I got strong feeling that it's better to avoid problems with email server configuration and maintance and to choose email provider which will take care of all painful problems. So several offers were compared: http://imgur.com/JkK2X.jpg Three of them look very attractive: Postageapp / Sendgrid / CritSend As alternative i'm considering setup GAE app. Email provider is quite easy to start work with, but have no idea how much effort require GAE to integrate with PHP. So my question is: which option is better to choose: email provider GAE ? Two factors are important here: business background (therefore prices are mentioned), work required to setup and maintain desired solution. Preferably i would love to avoid all email-related problems (like black lists and so on).

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  • Upgrading PHP on MacOSX without config_vars.mk ?

    - by Ken
    Hi everyone, I want to upgrade my php version running on MAMP to 5.3. I've copied the ./configure statement from phpinfo() and downloaded the 5.3 branch source i wish to compile. However, when i try to compile it i get an error about a missing config_vars.mk file from apxs. How can i solve this issue if i do not have the config_vars.mk? can one be deprecated? can i copy the one from the stock apache that comes installed on OS X (SL)? What will happen if i remove --with-apxs from the configure line? Thanks in advance for any help. It is greatly appreciated. Ken.

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  • How do I enable JPEG Support for PHP?

    - by ngache
    My Configure Command doesn't say anything about jpg, nor gif/png, but I can see gif/png support in the output of phpinfo(). I built PHP with --with-gd, but only GIF Support and PNG Support are in the output of phpinfo(), how do I enable JPEG Support? UPDATE I got this problem when compiling : Sorry, I cannot run apxs. Possible reasons follow: 1. Perl is not installed 2. apxs was not found. Try to pass the path using --with-apxs2=/path/to/apxs 3. Apache was not built using --enable-so (the apxs usage page is displayed) The output of /usr/local/apache2/bin/apxs follows: cannot open /usr/local/apache2/build/config_vars.mk: No such file or directory at /usr/local/apache2/bin/apxs line 218. What should I do now?

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  • Compiling PHP 5.3.3 on Ubuntu 8.04: Could not find libevent

    - by Nick
    When attempting to ./configure PHP 5.3.3 on Ubuntu 8.04, I get the error: checking for libevent >= 1.4.11 install prefix... configure: error: Could not find libevent >= 1.4.11 in /usr/local/ I tried installing the libevent-dev and libevent1 packages, but same error. I then removed the packages, downloaded and compiled libevent from source. Same error. Locate shows that libevent was installed to /usr/local/lib/libevent.so with all its friends in /usr/local/lib/. I tried configuring with the option: --with-libevent-dir=/usr/local/lib/ Basically the same error: checking for libevent >= 1.4.11 install prefix... configure: error: Could not find libevent >= 1.4.11 in /usr/local/lib/ Any suggestions??

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  • Python server does not excecute PHP script: permission denied

    - by krisvandenbergh
    I am trying to execute a PHP file through a Python server. However, I get the following error: File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/CGIHTTPServer.py", line 255, in run_cgi os.execve(scriptfile, args, os.environ) OSError: [Errno 13] Permission denied The python server is running though. What have I done so far? Chmod'ed recursively all directories to (chmod -R a+x) (I know this is not secure but its just for testing purposes) for both Python installation directories and my scripts. Tried to find out if python server is running as root through ps aux grep py I am out of ideas. What could be going wrong else? Thanks for the feedback.

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  • Problem to connect to MySQL server (error #2002) in PHP

    - by Martin
    I installed ZWAMP 1.0.7 (on Windows 7), but I'm having a weird problem. I can't connect to my MySQL server from any PHP script. If I try to use MySQL command line everything works fine but PHPMyAdmin retruns error #2002. I'm not sure whether it's important or not but MySQL server is not able to create socket file. I don't know what's the problem but I think everything is configured in my.cnf properly. Do you have any ideas?

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  • PHP-APC is exceeding limit apc.shm_size often

    - by user142741
    I am implementing the apc on a shared server that currently has 1000 sites (using wordpress, moodle, etc.). I'm Looking for the admin page, and I see "Cache full count" is growing rapidly. I've tried increasing the value of "apc.shm_size" reduce value "apc.ttl" increase the value "apc.shm_segments" but I can not resolve this issue. What am I doing wrong? I'm putting down some information: apc.ini: extension=apc.so apc.shm_size = 256 apc.enabled = 1 apc.ttl = 300 apc.user_ttl = 300 Ubuntu: 12.04 PHP: 5.3.10 APC: 3.1.7 Server has 16GB memory Limit share memory: 256MB

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  • Problem to connect to MySQL server (error #2002) in PHP

    - by user41514
    Hello, I installed ZWAMP 1.0.7 (on Windows 7), but I'm having a weird problem. I can't connect to my MySQL server from any PHP script. If I try to use MySQL command line everything works fine but PHPMyAdmin retruns error #2002. I'm not sure whether it's important or not but MySQL server is not able to create socket file. I don't know what's the problem but I think everything is configured in my.cnf properly. Do you have any ideas?

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  • how to limit disk space per user in a PHP web application & CentOS

    - by solid
    we have a web application written in PHP and we want all our users to be able to upload images for e.g. 50MB. We will create a directory structure so that every user has its own folder like app/user1/images app/user2/images ... Now everytime a user uploads an image, we need to check if this is still allowed or not but we don't want 1000 users to continously scan our hard drive counting file sizes in their directory. So writing a script that counts all file sizes in a user directory is not an option I guess? Is there an easier way to calculate used up space per user and limit our app accordingly?

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  • php mail not arrives at gmail, not at local server

    - by thomas
    The php mail function I am using does not work completely. It will sent mails to gmail easy enough. However, emails routed directly to my internally hosted exchange server are not getting through. The servers/domains are setup is as follows. URLs are registered with Network solutions (www.independentsservice.com & www.isco.net) NS directs all traffic to our ISP (Socket.net). Socket directs as follows: Mail to our local server FTP to our local server HTTP to our website hosted on Chihost.com Traffic to our local server goes through a Watchguard firewall which routes mail traffic to our locally hosted Exchange server. Is there some reason why exchange won't accept these emails? Thanks!

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  • todo manager (gtd): subtasks, php

    - by kusoksna
    Currently I'm using todoist.com as GTD manager. I'm almost satisfied with it. Is there any foss software, that could provide next features? 1. unlimited (at least 5) subtask levels 2. easy way to complete tasks (like in todoist) 3. easy to edit tasks 4. php based (as i want to host it on my server) 5. due dates (including recurring) 6. labels, colors, etc will be good, but not critical PS: i already checked several similar questions, including Which GTD tool/webservice do you recommend? But haven't found suitable software yet.

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  • Installing PHP with iconv on Mac OSX 10.6 gives error: "Undefined symbols for architecture x86_64"

    - by Jason
    I am setting up PHP on my local web server with iconv, which should be there by default, but I am getting the following error: Undefined symbols for architecture x86_64: "_iconv", referenced from: __php_iconv_strlen in iconv.o _php_iconv_string in iconv.o __php_iconv_strpos in iconv.o __php_iconv_appendl in iconv.o _zif_iconv_substr in iconv.o _zif_iconv_mime_encode in iconv.o _php_iconv_stream_filter_append_bucket in iconv.o ... (maybe you meant: _zif_iconv_strlen, _zif_iconv_strpos , _zif_iconv_mime_decode , _php_iconv_string , _zif_iconv_set_encoding , _zif_iconv_get_encoding , _zif_iconv_mime_decode_headers , _iconv_functions , _zif_iconv_mime_encode , _zif_iconv_strrpos , _iconv_module_entry , _iconv_globals , _zif_iconv_substr , _php_if_iconv , _zif_ob_iconv_handler ) ld: symbol(s) not found for architecture x86_64 Now, presumably this means that my iconv is not 64 bit. I tried to download libiconv and manually reinstall it with 64 bit, as such: CFLAGS='-arch i386 -arch ppc -arch ppc64 -arch x86_64' CCFLAGS='-arch i386 -arch ppc -arch ppc64 -arch x86_64' CXXFLAGS='-arch i386 -arch ppc -arch ppc64 -arch x86_64' ./configure But I get the following error: configure: error: in `/Users/jason/Downloads/libiconv-1.13.1': configure: error: C compiler cannot create executables See `config.log' for more details. In my config.lob file, it says at the bottom: configure: exit 77 Any suggestions?

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