ࡱ> 5@ bjbj22 (*XX@@@@@@@T||||$T#4#6#6#6#6#6#6#$$R!'dZ#@Z#@@o#@@4#4# @@" x^|z.P!4##0#j!''4"TT@@@@'@"HZ#Z#TT  TT Initial concepts PHP introduction and overview PHP main characteristics Client-Server computing Web-Browser Web-Server Scripting Language Server-side vs Client-side scripting A web browser is a software application that enables a user to display and interact with HTML documents hosted byweb servers or held in a file system. Popular browsers available for personal computers include Microsoft Internet Explorer, Mozilla Firefox, Opera, Netscape, Safari and Konqueror. Web-Server Every web server program operates by accepting HTTP requests from the network, and providing an HTTP response to the requester. The HTTP response typically consists of an HTML document, but can also be a raw text file, an image, or some other type of document. Scripting Language Scripting languages (commonly called scripting programming languages or script languages) are computer programming languages initially designed for "scripting" the operations of a computer. Early script languages were often called batch languages or job control languages. A script is more usually interpreted than compiled, but not always. A script language can be found at almost every level of a computer system. Besides being found at the level of the operating system, they appear in computer games, web applications, word processing documents, network software and more. Scripting Language Types: Application-specific languages Lingo, IRC Script, Emacs LISP, Text processing languages Awk, XSLT, Sed, Ruby, Job control languages and shells Bash, csh, sh, MSDOS batch, General-purpose generic languages PHP, Perl, Python, Ruby, Extension/Embedded languages Client-side scripting Client-side scripting generally refers to the class of computer programs on the web that are executed client-side, by the user's web browser. This type of computer programming is an important part of the Dynamic HTML (DHTML) concept, enabling web pages to be scripted; that is, to have different and changing content depending on user input, environmental conditions (such as the time of day), or other variables. Server-side scripting Server-side scripting is a web server technology in which a user's request is fulfilled by running a script directly on the web server to generate dynamic HTML pages. It is usually used to provide interactive web sites that interface to databases or other data stores. Introduction to PHP = Personal Home Page tools Created by Ramus Lerdorf to verify the accesses to his homepage (access counter) Web-oriented programming language: Server-side: PHP, ASP, JSP, CGIs, ... Client-side: JavaScript, ActiveX, Java Applets, ... PHP code is embedded in HTML pages, and processed at the server-side, and the results are returned back in HTML format Interpreted language => less performance than compile languages While programming language is similar to C/C++/Java...  PHP main characteristics Multiple OS support Unix (several variations), Linux, Windows 95/98/ME, Windows NT/WS, Windows 2000, Windows XP, Windows 2003 Server Multiple Web-servers support Apache Web-server (http://www.apache.org), Microsoft IIS, Microsoft PWS (http://www.microsoft.com), Xitami Web-server (http://www.imatix.com), OmniHTTPd (http://www.omnicron.ab.ca/httpd), Sambar server (http://www.sambar.com), and others Multiple databases support AdabasD, dbm, Dbase, FilePro, Informix, Interbase, FireBird, LDAP, Microsoft SQL Server, mSQL, mySQL, Oracle, PostgreSQL, Sybase, ODBC and SQLite Persistent database connections Persistent connections are links that do not close when the execution of your script ends. When a persistent connection is requested, PHP checks if there's already an identical persistent connection (that remained open from earlier) -and if it exists, it uses it. If it does not exist, it creates the link. 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