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Appendix A Introduction to Web Development PHP Programming with MySQL
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Introduction to Web Development
In 1990 and 1991,Tim Berners-Lee created the World Wide Web at the European Laboratory for Particle Physics (CERN) in Geneva, Switzerland The original purpose of the World Wide Web (WWW) was to provide easy access to cross-referenced documents that existed on the CERN computer network Hypertext linking allows you to quickly open other Web pages PHP Programming with MySQL
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HTML Documents Web pages are created using Hypertext Markup Language (HTML) Web pages are commonly referred to as HTML pages or documents A markup language is a set of characters or symbols that define a document’s logical structure HTML is based on an older language called Standard Generalized Markup Language (SGML) PHP Programming with MySQL
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HTML Documents (continued)
Like SGML, HTML was originally designed as a way of defining the elements in a document independent of how they would appear HTML has evolved into a language that defines how elements should appear in a Web browser PHP Programming with MySQL
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Basic HTML Syntax HTML documents are text documents that contain formatting instructions called tags HTML tags include: Formatting commands (boldface or italic) Controls that allow user input (option buttons or check boxes) Tags are enclosed in brackets (< >) and consist of an opening tag and a closing tag PHP Programming with MySQL
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Basic HTML Syntax (continued)
The closing tag must include a forward slash ( / ) immediately after the opening bracket A tag pair and the data it contains are referred to as an element The information contained within an element’s opening and closing tags is referred to as its content Elements that do not require a closing tag are called empty elements PHP Programming with MySQL
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Basic HTML Syntax (continued)
Table 1-1 Common HTML elements PHP Programming with MySQL
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Basic HTML Syntax (continued)
HTML documents must have a file extension of .html or .htm All HTML documents must use the <html> element as the root element A root element contains all the other elements in a document The <head> element contains information that is used by the Web browser PHP Programming with MySQL
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Basic HTML Syntax (continued)
A <head> element must contain a <title> element The <head> element and the elements it contains are referred to as the document head The <body> element and the text and elements it contains are referred to as the document body The process by which a Web browser assembles or formats an HTML document is called parsing or rendering PHP Programming with MySQL
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Basic HTML Syntax (continued)
Example: <p><b>This paragraph will appear in boldface in a Web browser</b></p> Parameters used to configure many HTML elements are called attributes Insert line breaks using the paragraph <p> and line break <br> elements PHP Programming with MySQL
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Basic HTML Syntax (continued)
Sample HTML Code <html> <head> <title>Toner Cartridge Sales</title> </head> <body> <h1>Toner Cartridge Sales</h1> <hr> <h2>Lexmark Toner Cartridges</h2> <img src="lexmark_logo.gif"> <p><b>Model #</b>:LEX <br> <b>Compatibility</b>: Optra 4049/3112/3116<br> <b>Price</b>: $189.99</p> <p><b>Model #</b>:LEX <br> <b>Compatibility</b>:Lexmark 4019/4028/4029<br> <b>Price</b>:$209.00</p> </body> </html> PHP Programming with MySQL
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Basic HTML Syntax (continued)
Figure 1-1 A simple HTML document in a Web browser PHP Programming with MySQL
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Web Communication Protocols
A Web page is identified by a unique address called the URL Each URL consists of two basic parts: A protocol (usually HTTP) and Either the domain name for a Web server or a Web server’s Internet Protocol address Hypertext Transfer Protocol (HTTP) manages the hypertext links that are used to navigate the Web PHP Programming with MySQL
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Web Communication Protocols (continued)
A host refers to a computer system that is being accessed by a remote computer A domain name is a unique address used for identifying a computer such as a Web server on the Internet The domain identifier identifies the type of institution or organization (.biz, .com, .edu, .org) An Internet Protocol, or IP address, is another way to identify computers or devices connected to the Internet PHP Programming with MySQL
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Web Communication Protocols (continued)
An IP address consists of a series of four groups of numbers separated by periods Each Internet domain name is associated with a unique IP address HTTP is a component of Transmission Control Protocol/Internet Protocol (TCP/IP) Hypertext Transfer Protocol Secure (HTTPS) provides secure Internet connections for transactions that require security and privacy PHP Programming with MySQL
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Web Communication Protocols (continued)
Protocol Domain name Directory Filename Figure 1-4 Sample URL PHP Programming with MySQL
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Publishing Your Web Site
Web Hosting: The publication of a Web site for public access Internet access (cable modem, DSL, satellite, dial-up modem, ISP) Internet Service Provider (ISP): Provides access to the Internet along with other types of services such as America Online, CompuServe, and EarthLink PHP Programming with MySQL
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Publishing Your Web Site (continued)
ISP advantages to hosting a Web site: Extremely fast Internet connections using advanced fiber-optic connections Large and powerful Web servers and the expertise and manpower to maintain and manage them A domain name is a unique address used for identifying a computer, such as a Web server on the Internet PHP Programming with MySQL
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Publishing Your Web Site (continued)
Domain name registration Pick a domain name that is similar to your business name or that describes your Web site You cannot use a domain name that is already in use or a trademarked name Contact a domain name registrar to find out the availability of a domain name and register it Domain names are stored in a master database that is maintained by the InterNIC PHP Programming with MySQL
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Publishing Your Web Site (continued)
Domain name registration (continued) For a fee, domain names can be registered for a specified period of time A popular domain name registrar is Network Solutions After you register your domain name, notify your ISP of your domain information PHP Programming with MySQL
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Publishing Your Web Site (continued)
File Transfer Protocol (FTP) Is a TCP/IP protocol used for transferring files across the Internet Transfers files between an FTP client (your computer) and an FTP server (a server capable of running FTP) The vehicle that allows you to get your Web page files to the Web server PHP Programming with MySQL
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Publishing Your Web Site (continued)
File Transfer Protocol (continued) Your ISP provides a username and password to log on to the FTP site and upload files to the FTP server Examples of FTP clients include Filezilla, Firefox, Internet Explorer Allows you to use your browser to log on to an FTP server and upload your files PHP Programming with MySQL
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Working with Well-Formed Web Pages
HTML became an Internet standard in 1993 with the release of version 1.0 The current version of HTML (4.01) was released in 1999 HTML 4.01 is the last version of the HTML language and is being replaced with extensible hypertext markup language (XHTML) HTML is not suitable for user agents other than Web browsers PHP Programming with MySQL
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XHTML Document Type Definitions (DTDs)
A well-formed document must include: <!DOCTYPE> declaration <html>, <head>, and <body> elements A document type definition (DTD) defines: The elements and attributes that can be used in a document The rules that a document must follow when it includes them PHP Programming with MySQL
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XHTML Document Type Definitions (DTDs) (continued)
There are three types of DTDs with XHTML documents: transitional strict frameset The World Wide Web Consortium (W3C) was established in 1994 at MIT to oversee the development of Web technology standards PHP Programming with MySQL
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XHTML Document Type Definitions (DTDs) (continued)
The W3C: Decided some common HTML elements and attributes for display and formatting would not be used in XHTML 1.0 Recommended using Cascading Style Sheets (CSS) instead of HTML elements and attributes for displaying and formatting Web pages Elements and attributes that are considered obsolete and will eventually be eliminated are said to be deprecated PHP Programming with MySQL
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XHTML Document Type Definitions (DTDs) (continued)
Table 1-2 HTML elements that are deprecated in XHTML 1.0 PHP Programming with MySQL
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XHTML Document Type Definitions (DTDs) (continued)
Transitional DTD: Allows you to use deprecated style elements in your XHTML documents Use only if you need to create Web pages that use the deprecated elements Frameset DTD: Identical to the transitional DTD, except that it includes the <frameset> and <frame> elements Allows you to split the browser window into two or more frames PHP Programming with MySQL
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XHTML Document Type Definitions (DTDs) (continued)
Strict DTD: Eliminates the elements that were deprecated in the transitional DTD and frameset DTD The <!DOCTYPE> declaration for the strict DTD is as follows: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" " Always try to use the strict DTD PHP Programming with MySQL
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Writing Well-Formed Documents
Include a <!DOCTYPE> declaration and the <html>, <head>, and <body> elements All XHTML documents must use <html> as the root element XHTML is case sensitive All XHTML elements must have a closing tag Attribute values must appear within quotation marks PHP Programming with MySQL
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Writing Well-Formed Documents (continued)
Empty elements must be closed XHTML elements must be properly nested Nesting refers to how elements are placed inside other elements PHP Programming with MySQL
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Cascading Style Sheets
A single piece of CSS formatting information, such as text alignment, is referred to as a style The term cascading refers to the ability for Web pages to use CSS information from more than one source PHP Programming with MySQL
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Cascading Style Sheets (continued)
CSS properties: CSS styles are created with two parts separated by a colon The property refers to a specific CSS style The value assigned to it determines the style’s visual characteristics Together, a CSS property and the value assigned to it are referred to as a declaration or style declaration PHP Programming with MySQL
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Cascading Style Sheets (continued)
Inline Styles Allow you to add style information to a single element in a document Internal Style Sheets Create styles that apply to the entire document P { color : blue } selector property value External Style Sheets A separate text document containing style declarations that are used by multiple documents on a Web site PHP Programming with MySQL
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Client/Server Architecture
Server (“back end”): A database from which a client requests information Fulfills a request for information by managing the request or serving the requested information to the client Responsible for data storage and management A system consisting of a client and a server is known as a two-tier system PHP Programming with MySQL
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Client/Server Architecture (continued)
Client (“front end”): Presents an interface to the user Gathers information from the user, submits it to a server, then receives, formats, and presents the results returned from the server PHP Programming with MySQL
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Client/Server Architecture (continued)
A three-tier, or multi-tier, client/server system consists of three distinct pieces: Client tier, or user interface tier, is the Web browser Processing tier, or middle tier, handles the interaction between the Web browser client and the data storage tier Performs necessary processing or calculations based on the request from the client tier Handles the return of any information to the client tier PHP Programming with MySQL
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Client/Server Architecture (continued)
Figure 1-16 The design of a three-tier client/server system PHP Programming with MySQL
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JavaScript and Client-Side Scripting
JavaScript is: A client-side scripting language that allows Web page authors to develop interactive Web pages and sites Used in most Web browsers including Firefox and Internet Explorer Client-side scripting is a language that runs on a local browser (on the client tier) instead of on a Web server (on the processing tier) PHP Programming with MySQL
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JavaScript and Client-Side Scripting (continued)
JavaScript allows you to: Turn static Web pages into applications such as games or calculators Change the contents of a Web page after a browser has rendered it Create visual effects such as animation Control the Web browser window itself PHP Programming with MySQL
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Server-Side Scripting and PHP
Server-side scripting refers to a scripting language that is executed from a Web server Hypertext Preprocessor (PHP) is a server-side scripting language that is used to develop interactive Web sites Is easy to learn Includes object-oriented programming capabilities Supports many types of databases (MySQL, Oracle, Sybase, ODBC-compliant) PHP Programming with MySQL
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Server-Side Scripting and PHP (continued)
PHP is an open source programming language Open source refers to software where source code can be freely used and modified Can’t access or manipulate a Web browser like JavaScript Exists and executes solely on a Web server, where it performs various types of processing or accesses databases PHP Programming with MySQL
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Server-Side Scripting and PHP (continued)
General rule: Use client-side scripting to handle user interface processing and light processing, such as validation; use server-side scripting for intensive calculations and data storage Figure 1-17 How a Web server processes a PHP script PHP Programming with MySQL
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