For this reason, you cannot see the PHP code of a website, only the resulting HTML that the PHP scripts have produced. The web server then sends the processed HTML back to you (which is where 'Hypertext Preprocessor' in the name comes from), and your web browser displays the results. Instead, the form data or request for the web page gets sent to a web server to be processed by the PHP scripts. ![]() For example, if you complete a form on a website and submit it, or click a link to a web page written in PHP, no actual PHP code runs on your computer. The largest Social Networking Platform, Facebook is written using PHP How does PHP work?Īll PHP code is executed on a web server only, not on your local computer. Restricting access to certain pages of your website.Setting and working with website cookies.Processing and saving user input from form data.For example, if you have a blog website, you might write some PHP scripts to retrieve your blog posts from a database and display them. Typically, it is used in the first form to generate web page content dynamically. Websites and web applications (server-side scripting).It is typically used on websites to generate web page content dynamically. What is PHP used for?Īs of October 2018, PHP is used on 80% of websites whose server-side language is known. PHP is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. There's no need to preemptively save the result in a variable either.PHP is a server-side scripting language created in 1995 by Rasmus Lerdorf. Without having to worry about the function being re-evaluated for every case. I think this fact needs a little bit more attention, so here's an example: ![]() The difference between a series of if statements and the switch statement is that the expression you're comparing with, is evaluated only once in a switch statement. This is listed in the documentation above, but it's a bit tucked away between the paragraphs. ![]() 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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