Archive for the ‘PHP’ Category

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PHP apache_note, Graphite & Logster for logging

In: General|Linux|PHP

9 Jan 2012

A nice tip for logging data against apache logs within requests. Apache_note is a wrapper for Apache’s table_get and table_set. It edits the table of notes that exists during a request. The table’s purpose is to allow Apache modules to communicate. if (function_exists(‘apache_note’)) { if (isset($_SESSION) && !empty($_SESSION)) { apache_note(‘session_id’, session_id()); apache_note(‘users_id’, isset($_SESSION['users_id'])? $_SESSION['users_id'] : [...]

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Vagrant – Automating PHP/MySQL Installation with bash/slack for continuous deployment

In: General|Linux|MySQL|PHP

11 Dec 2011

Vagrant is simply a wrapper around Virtualbox headless that allows for provisioning virtual machines with support for puppet, chef-solo, chef, and bash. This allows you to automate the deployment and sandboxing of development sites. Additional base box images can be found at vagrantbox.es. Installing Vagrant apt-get install -y ruby1.9.1 ruby1.9.1-dev ln -svf /usr/bin/ruby1.9.1 /etc/alternatives/ruby gem [...]

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PHP5.3 autoload/class_exists fail

In: PHP

10 Dec 2011

Every now and then I come across a problem with PHPs autoloading whereby class_exists fails to autoload classes. I’ve noticed this with a number of PHP versions, most recently with 5.3.2-1ubuntu4.9. Typically I’ve resolved this by simply upgrading the PHP version. In the following example the initial class_exists fails until you instantiate the object and [...]

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Selenium

In: General|PHP

1 Dec 2011

A little while ago, I did an internal presentation on selenium at Everlution. I’ve put this on slideshare, which can be found here. The key problem to entry is simply getting people to record the actions and the issues they are reporting. I often find trying to reproduce the problem on complex software can take [...]

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Memcached multigets – ubuntu vs debian

In: General|Linux|PHP

14 Jun 2011

I Spent a little while yesterday investigating why memcached causes problems with multigets returning results and ended up comparing debian vs ubuntu. I tested from virtual machines and physical hardware of relative specs. I have also tried a combination of libmemcached libraries and tuned the tcp stack, however here are some of the results from [...]

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MySQL to Oracle synchronization using PHP over VPNC

In: General|Linux|MySQL|PHP

23 Jan 2011

One of our clients Gorkana was bought by Durrants. As such I have been working on integrating and merging data. As a result I wrote a script to synchronize data between MySQL and Oracle, which is presently a one way synchronization. The implementation The script(s) to synchronize data was broken into a few scripts. Automatically [...]

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Emailing Attachments: Exim Filters and PHP streams

In: PHP

31 May 2010

A while back a colleague and myself had a two week sprint to ensure that we could deliver 20k emails with up to 5mb attachments each. We experimented with 4k emails at 5mb each sending straight through the MTA, which we found to cause excessive load on the servers. Using exim filters we could add [...]

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Soap, XmlRpc and Rest with the Zend Framework

In: MySQL|PHP

20 Feb 2008

The Project I was recently working on a project to expose our trading systems via XmlRpc, Rest and SOAP. It was quite an interesting project, which took two of us three weeks to develop (Amongst other things). This involved creating a testbed, that would automatically generate the payload and response for each protocol. The parameters [...]

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MySQL & PHP Performance Optimization Tips

In: MySQL|PHP

25 Jun 2007

In high performance web applications you will always have bottlenecks within your application. Identifying these bottlenecks and optimizing is a tedious task and typically show themselves underload. A single bad/unindexed query can bring a server to its knees. A large number of rows will also help to highlight any poor queries, and on very large [...]

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Installing memcached

In: Linux|PHP

7 Apr 2007

Recently I had to install memcache on a number of servers, and I would always tend to end up with errors whilst memcache tries to locate libevent. I always seem to forgett LD_DEBUG, so I figured I would write up the process for installing memcache. One of the dependencies of memcache is libevent, so firstly [...]

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Andrew Johnstone is a software engineer / lead developer working at Everlution Software.

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