In the last article, we looked at how the facade design pattern can be employed to simplify the employment of any large and complex system using only a simple facade class. In this article, we will continue our discussion on design patterns by taking a look at the adapter design …
When it comes to design patterns, you may have questions: Why should we use design patterns in programming? Our code can work just fine without it. To that, my counter question would be: “Would you rather live in a luxurious home, or in a simple establishment with four walls?” After …
Here is an easy way to build a PHP extension with C++ and default PHP packages on a Ubuntu system. I use SWIG to wrap C++ code to the Zend API. When using loops and recursion intensively, porting a few functions to C++ can give you some extra power. First, …
Create PDF invoices with HTML5 and PhantomJS Creating invoices in PDF is always a bit tricky: there are many libraries to create PDF documents with PHP, but most can’t handle complex layouts and require a lot of memory and CPU time. Things like Unicode characters and line/page breaks are often …
Make PDFs searchable pre { background-color:#444; white-space:pre-wrap; font-size:80%; padding:0px 6px; } I searched for a good way to make scanned documents searchable. Most newer scanning software already has some OCR built-in, but what about all the old documents? Using pdfsandwich and Tesseract, we recover the text from each page of …
The power of column stores pre { background-color:#444; white-space:pre-wrap; font-size:85%; padding:0px 6px; } using column stores instead of row based stores can reduce access logs from 10 GB to 130 MB of disk space reading compressed log files is 4 times faster than reading uncompressed files from hard disk column …
Runtime vs. memory usage pre { background-color:#444; white-space:pre-wrap; font-size:80%; padding:0px 6px; } Oftentimes, better runtime can result in higher memory usage. Here is an example to create some strings to test bulk inserts on Redis: $cmd = “”;$start = microtime(true);for ($i=0; $i
Developers’s time of permanency is 15 years? pre { background-color:#444; white-space:pre-wrap; font-size:90%; padding:0px 6px; } This article is not about performance of PHP, but more about performance of developers in general.A nice article from golem.de claims that the developers’s time of permanency is – exactly – 15 years. The main …
Applying Scrum to legacy code and maintenance tasks There are some problems with Scrum that mainly occur when dealing with third party components or legacy systems: wrong estimations (time, impact, risk, complexity) bad requirements (inconsistent, incomplete, testable, conflicting, faulty) development involved in operations (bug analysis, data correction, deployment, hot-fixes) delays …
How to implement a real-time chat server in PHP using Server-Sent Events (update: added C benchmark) pre { background-color:#444; white-space:pre-wrap; font-size:80%; padding:0px 6px; } Lessons learned: A web server written in PHP can give more than 10000 req/s on small hardware A web server written in PHP is not slower …
PHP Framework Comparison Reading about PHP frameworks, you’ll get a lot about Symfony and Zend Framework. It is true that these frameworks have a lot of features and do great marketing. But what about performance and scalability? There are 2 kinds of frameworks: those written in C as an extension …
How to implement really small and fast ORM with PHP (Part 4: specification error handling) pre { background-color:#444; white-space:pre-wrap; font-size:90%; padding:0px 6px; } Queries are gaining more and more complexity, data is getting bigger and bigger. Most optimizations in database technology are done in the database server. This is an …
Members, __set, __get, ArrayAccess and Iterator pre { background-color:#444; white-space:pre-wrap; font-size:85%; padding:0px 6px; } Lessons learned: __set() is 5 times slower than setting a member __get() + __set() is 13 times slower than incrementing a member Iterator is 4 times slower than using a member ArrayAccess is 3 times slower …
How to implement a real life benchmark with PHP pre { background-color:#444; white-space:pre-wrap; font-size:80%; padding:0px 6px; } To determine the maximum capacity of a web page, Apache ab is often used in the first step. Fetching one URL very often is optimal for caching and gives a best case. To …
