![]() ![]() ![]() In 2021, Facebook had 40 million square feet of data center space among its 18 campuses around the globe that host millions of servers.Facebook users generate 8 billion video views per day on average, 20% of which are live broadcast.Every 60 seconds: 317 thousand status updates are added, 147 thousand photos are uploaded, and 54 thousand links are shared on Facebook.Facebook had 2.96 billion users as of Q4 2022 (the service is available in over 100 languages).Facebook’s Scaling Challengeīefore we get into the details, here are a few factoids to give you an idea of the scaling challenge that Facebook has to deal with: This article takes a look at some of the software and techniques they use to accomplish that. The challenge for Facebook’s engineers has been to keep the site up and running smoothly in spite of handling over two billion active users. Tutorial if you are only interested in web programming.At the scale that Facebook operates, several traditional approaches to serving web content break down or simply aren’t practical. Start writing simple scripts in a few hours.Īlthough PHP's development is focused on server-side scripting, The best part about using PHP is that it is extremely simpleįor a newcomer, but offers many advanced features forĪ professional programmer. Way that users can tell what you have up your sleeve. To process all your HTML files with PHP, and then there's really no The results of running that script, but would not know Is that the code is executed on the server, generating HTML which What distinguishes PHP from something like client-side JavaScript That allow you to jump into and out of "PHP mode." The PHP code is enclosed in special start and end processing ![]() "something" (in this case, output "Hi, I'm a PHP script!"). PHP pages contain HTML with embedded code that does Instead of lots of commands to output HTML (as seen in C or Perl), Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search ![]()
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