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• pdf errors with php, apache2

  - by julio

  Hi-- I'm seeing some strange behavior from some dynamically generated PDFs using the TCPDF library in PHP. Standard lamp stack-- however, if you try to open the PDF from Windows with Acrobat Reader, it gives an error that the "file is damaged and could not be repaired". From Mac, Linux, etc. the file works fine, and opens fine. It also opens fine in Google Docs-- so clearly the PDF itself is ok. Is it possible that the mime type (application/pdf) is causing problems in Windows? Thanks

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• Getting php tips and tutorials as daily emails to improve the knowledge in php programming

  - by Sourabh

  Hi Thanks for your time. This question is related to php programming but not a programming question.I have a young team of php (LAMP + javascript) programmers.I want them to learn better coding and keep themselves updated with the latest advancements in web domain. I was thinking if there was any web site which send daily emails about php questions / problems/ solutions to common problems/ tips which will practically help the people to spend 10-15 minutes daily and enjoy the learning.This will also kind of automate the habit of self learning on daily basis. There are lots of PHP forums and php tutorials website, I tried to google but I did not find any website which does what I am looking for. Please let me know if you know such website.If you have any other ideas to achieve the goal are also welcome. -Sourabh

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• Communicating between an overlayed iFrame and the underlying page (LAMP)

  - by stef

  I have a small form is to be filled in. If the user is logged in, the form is submitted as normal. If the user is not logged in, I show an overlayer with an iframe'd page that contains a login box where he enters his credentials. If the credentials are correct I can "break out" of the frame to "return" to the main page, but how can I update this main page for example to show "you are now logged in" and to change the JS / PHP login that determines whether or not the form can be submitted normally and not be intercepted again by the overlayer prompt? Afaik, these two separate pages are not aware of each other so I'm struggling to find a solution to this problem. This is in a LAMP / jQuery / CodeIgniter environment. EDIT: Could CodeIgniter's XML RPC class be useful for this?

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• Content cacheing with PHP and CodeIgniter

  - by Josh K

  I have a couple of things I'm working on, namely a page that issues five or six cURL requests and processing content on them. I'm working with CodeIgniter on a LAMP stack but am open to other options. Naturally I would prefer to not rewrite the application. I would like to know if there are any ready-made / easily learned caching methods. Primarily I'd like to check if the page has changed since I last scrapped it. If it has, redownload and present. If it hasn't, serve up a cached copy.

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• How to display my server's current response time to an average user

  - by Jason

  Sorry, I'm not really sure of the right way to ask this one so bear with me... We have a web application that runs on a set of servers at a data center (not in our offices) We want to be able to somehow 'advertise' to our clients/users that the availability or response time of our servers has met a standard throughout the day. I am being asked to come up with a standard metric that we can easily advertise on our login screen that shows current "standard response time" checked every x minutes. My thinking is that I need to capture something like the results of a traceroute from a server (either in our office, amazon, etc..) to one of the data center servers and come up with a Red/Yellow/Green type of a notifier for the login screen to let the user know that our tests are responding normally and if they are having delay issues it could be their network or connection to the internet. We have lots of clients in rural areas that have poor connectivity and we are trying to let them know any slowness might be on their end, not ours. I've got the LAMP stack to work with, but this could also be some other system all together as long as it can update the main server with the results. I already have pingdom reports that are available, but that's a bit more than people want to read sometimes. Any ideas on what I can do?

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• How to share cookies across multiple Apache Virtual Hosts

  - by puk

  This question is generally phrased as "How to share cookies across multiple subdomains" and the answer is generally to use the leading dot like so setcookie( 'id', 0, time()+30*3600, '/', '.example.com' ); which means that the cookie is available to all subdomains of example.com. However, the / path I suspect adds the constraint that all subdomains must be physically under the same tree. The PHP documentation states path The path on the server in which the cookie will be available on. If set to '/', the cookie will be available within the entire domain. If set to '/foo/', the cookie will only be available within the /foo/ directory and all sub-directories such as /foo/bar/ of domain. The default value is the current directory that the cookie is being set in. Is it possible to share cookies if one has two (Apache) Virtual Hosts set up with document roots at, for example www.one.example.com ? /var/www/example1 www.two.example.com ? /var/www/example2

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• Need to kill a session?

  - by rob - not a robber

  Really quick here... I think I have the answer, but just looking for some validation. I have a site with two "points of entry." One is for a standard user and one is for an admin account. In the real world, an admin could have a standard user account and try to login as an admin while already being under the standard user session. I have two separate front ends to facilitate login. The normal user one is frilly and has ads and the like, the admin one is strictly business, so any suggestion to have the two user types login through the same "door" is not on the table. Would you advise on the admin login page to destroy any active sessions? Once the admin is in, they'll only be tooling around in their admin area and not on the main site. Has anyone run into probs using this method and having an admin-type user try to log back in in a new window as a "user" to view changes from a logged in user's prespective? Thanks in advance. So many cans of worms :)

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• How to include CKeditor which is outside of your document root

  - by Asif

  Hi, Is it possible to use CKeditor which resides outside of your document root inside document root application? For e.g. I am having directory structure like: My Documentroot C://xampp/htdocs/example.com My CKeditor is outside and parallel to document root say C://xampp/lib/ckeditor How can I call ckeditor.js which is in C://xampp/lib/ckeditor/ckeditor in my application page in C://xampp/htdocs/example.com/editor.php

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• How to delete a large cookie that causes Apache to 400

  - by jakemcgraw

  I've come across an issue where a web application has managed to create a cookie on the client, which, when submitted by the client to Apache, causes Apache to return the following: HTTP/1.1 400 Bad Request Date: Mon, 08 Mar 2010 21:21:21 GMT Server: Apache/2.2.3 (Red Hat) Content-Length: 7274 Connection: close Content-Type: text/html; charset=iso-8859-1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Size of a request header field exceeds server limit.<br /> <pre> Cookie: ::: A REALLY LONG COOKIE ::: </pre> </p> <hr> <address>Apache/2.2.3 (Red Hat) Server at www.foobar.com Port 80</address> </body></html> After looking into the issue, it would appear that the web application has managed to create a really long cookie, over 7000 characters. Now, don't ask me how the web application was able to do this, I was under the impression browsers were supposed to prevent this from happening. I've managed to come up with a solution to prevent the cookies from growing out of control again. The issue I'm trying to tackle is how do I reset the large cookie on the client if every time the client tries to submit a request to Apache, Apache returns a 400 client error? I've tried using the ErrorDocument directive, but it appears that Apache bails on the request before reaching any custom error handling.

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• How to enable core PHP extension in Linux?

  - by Yarin

  I'm trying to understand the process for enabling an a core extension (dom) in php. When I run phpinfo, I see '--disable-dom' in the configure command. Am I supposed to re-install PHP?

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• How do I change the root directory of an apache server?

  - by Spencer Cooley

  Does anyone know how to change the document root of the Apache server? I basically want localhost to come from /users/spencer/projects directory instead of /var/www. Edit I ended up figuring it out. Some suggested I change the httpd.conf file, but I ended up finding a file in /etc/apache2/sites-available/default and changed the root directory from /var/www to /home/myusername/projects_folder and that worked.

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• web design question (php/ajax)

  - by tom smith

  Hi guys... Hope this isn't a waste of your time. I'm working on a project, and it occured to me that there's a chunk of code out there, that should allow me to see how others have implemented this. I've got a project where I'm going to have a page, with a sel box. the user will select an item from the selList, and based on the item selected, a separate section of the page (areaB) will change in terms of the content/tbls being displayed. i then want to allow the user to go through a series of subpages in areaB, where the user goes through a submit/cancel/confirm process, where the stuff in areaB changes, with the rest of the page remaining the same... i'm trying to figure out the best approach to implement the on both client/server side. i could just have an ugly "if block" where i have abunch of logic, and i completely regen the page each time the user selects an action.. i could have an approach that might involve divs/frames, where i then just regen the targeted frame/div area.. is this even possible?? i could have some form of ajaxy process, which would only alter the targeted section(s) of the page... so.. i'm trying to talk to anyone who has ideas on how to do this, or more ideally, if you know of a good code (client/server) side example of this... that i can examine. i'd really appreciate it!! i've got a more detailed overview but didn't know if it would be cool to post it here... thanks.. tom

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• What is optimal hardware configuration for heavy load LAMP application

  - by Piotr Kochanski

  I need to run Linux-Apache-PHP-MySQL application (Moodle e-learning platform) for a large number of concurrent users - I am aiming 5000 users. By concurrent I mean that 5000 people should be able to work with the application at the same time. "Work" means not only do database reads but writes as well. The application is not very typical, since it is doing a lot of inserts/updates on the database, so caching techniques are not helping to much. We are using InnoDB storage engine. In addition application is not written with performance in mind. For instance one Apache thread usually occupies about 30-50 MB of RAM. I would be greatful for information what hardware is needed to build scalable configuration that is able to handle this kind of load. We are using right now two HP DLG 380 with two 4 core processors which are able to handle much lower load (typically 300-500 concurrent users). Is it reasonable to invest in this kind of boxes and build cluster using them or is it better to go with some more high-end hardware? I am particularly curious how many and how powerful servers are needed (number of processors/cores, size of RAM) what network equipment should be used (what kind of switches, network cards) any other hardware, like particular disc storage solutions, etc, that are needed Another thing is how to put together everything, that is what is the most optimal architecture. Clustering with MySQL is rather hard (people are complaining about MySQL Cluster, even here on Stackoverflow).

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• User upload file above web root with php

  - by Chris

  I have a website where local bands can have a profile page, I'm implementing an upload system so that they can add songs to their profile. I want to make sure that clever visitors to my website cannot download their songs. I was thinking about uploading them to above the folder for my domain so that they cannot be accessed directly. Is this a good idea and/or possible? If not, what do you suggest I do to try and avoid users downloading songs. I'm already using a flash player to try and prevent downloads.

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• mysql how to see most common queries (Lamp server, cpanel whm)

  - by Nikos

  I have a server and many websites, i want to see the most common queries so that to optimize them. Do you know any tool or any way to collect some statistics ? Thank you

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• Looking for programmer in NYC

  - by Oren

  I have taken the idea of "language maintenance" a niche that no one is paying attention to and created a company focused on live conversation with complimentary tools. Looking to create a web 2.0 style social network with an already clearly defined brand identity, design and plan. Already have assembled a team but am looking for a passionate programmer to take the technical lead and create a functional alpha and beta.

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• LAMP v/s WAMP in PHP

  - by Ajith

  I have a small server problem when working with LAMPP and WAMP server in PHP.I am using LAMPP server for local development and I need to host in WAMP server.When try to read an image from a dynamic created pdf file in LAMPP, it is working perfectly but, the same one not compact able with WAMP server.What will be the problem?Any additional feature need to configure in WAMP.Please help me to go forward.Please........

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• Best practices for withstanding launch day traffic burst

  - by Sam McAfee

  We are working on a website for a client that (for once) is expected to get a fair amount of traffic on day one. There are press releases, people are blogging about it, etc. I am a little concerned that we're going to fall flat on our face on day one. What are the main things you would look at to ensure (in advance without real traffic data) that you can stay standing after a big launch. Details: This is a L/A/M/PHP stack, using an internally developed MVC framework. This is currently being launched on one server, with Apache and MySQL both on it, but we can break that up if need be. We are already installing memcached and doing as much PHP-level caching as we can think of. Some of the pages are rather query intensive, and we are using Smarty as our template engine. Keep in mind there is no time to change any of these major aspects--this is the just the setup. What sorts of things should we watch out for?

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• How many users are sufficient to make a heavy load for web application

  - by galymzhan

  I have a web application, which has been suffering high load recent days. The application runs on single server which has 8-core Intel CPU and 4gb of RAM. Software: Drupal 5 (Apache 2, PHP5, MySQL5) running on Debian. After reaching 500 authenticated and 200 anonymous users (simultaneous), the application drastically decreases its performance up to total failure. The biggest load comes from authenticated users, who perform activities, causing insert/update/deletes on db. I think mysql is a bottleneck. Is it normal to slow down on such number of users? EDIT: I forgot to mention that I did some kind of profiling. I runned commands top, htop and they showed me that all memory was being used by MySQL! After some time MySQL starts to perform terribly slow, site goes down, and we have to restart/stop apache to reduce load. Administrators said that there was about 200 active mysql connections at that moment. The worst point is that we need to solve this ASAP, I can't do deep profiling analysis/code refactoring, so I'm considering 2 ways: my tables are MyIsam, I heard they use table-level locking which is very slow, is it right? could I change it to Innodb without worry? what if I take MySQL, and move it to dedicated machine with a lot of RAM?

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• Best way to simulate a domain?

  - by John Isaacks

  I am going to build a website on a test server that will behave differently depending on which domain is used to access it (The real website will have multiple domains pointing to it). But how will I be able to simulate the different domains on the test server?

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• ubuntu on virtual machine vs ubuntu install, what the difference?

  - by Yosef

  Hi, I have windows xp in my work and i programming on zend framework. I need to install ubuntu for execute doctrine orm commands from linux console, I faile to do it on windows. I thinking about 2 option of UBUNTU installation: 1.install ubuntu 10.04 on Virtual Box (Sun Virtual Machine). 2.create new primary partition and install ubuntu 10.04 directly. Which options do you suggest to do? Thanks

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• Best way to migrate servers without losing any data and with no downtime(?)

  - by ina

  This is a methodology question from a freelancer, with a corollary on MySQL.. Is there a way to migrate from an old dedicated server to a new one without losing any data in-between - and with no downtime? In the past, I've had to lose MySQL data between the time when the new server goes up (i.e., all files transferred, system up and ready), and when I take the old server down (data still transferred to old until new one takes over). There is also a short period where both are down for DNS, etc., to refresh. Is there a way for MySQL/root to easily transfer all data that was updated/inserted between a certain time frame?

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• Where to place web server root?

  - by nefo_x

  Hello everybody, I've just made an upgrade and now partly thinking on web-server directory structure for local workstation for web-development on linux platform. Running multiple hosts and different projects required. Where is it better to put all the server's docroots? /var/www? /srv? /www? I plan to make it as separate partition - could it be good for backups? :) I'm looking forward to your thoughts on this.

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• Prevent process leak on LAMP environment

  - by Guerra

  I work with Magento applications, and i'm on kind of situation: When user load some stores that have mutch information/jquery need lot of server process, if the user refresh the store mutch times pressing F5 the server get too mutch slow and difficult to use the store. I need prevent this F5 'hack' slow my server, what i can do?? I think some kind of javascript/php solution. But i want you opnion. Ty all in advance.

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• PDOException “could not find driver”

  - by Mike

  I have just installed Debian Lenny with Apache, MySQL, and PHP and I am receiving a PDOException could not find driver. This is the specific line of code it is referring to: $dbh = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PASS) DB_HOST, DB_NAME, DB_USER, and DB_PASS are constants that I have defined. It works fine on the production server (and on my previous Ubuntu Server setup). Is this something to do with my PHP installation? Searching the internet has not helped, all I get is experts-exchange and examples, but no solutions.

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