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Module 1

Module 1. Introduction to PHP. Objectives. What is PHP? How does a PHP script work with a Web Browser and a Web Server? What software and components you need to get started with PHP? To create and run a simple PHP script. What Is PHP?. PHP, PHP Hypertext Preprocessor

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Module 1

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  1. Module 1 Introduction to PHP CS346 PHP

  2. Objectives • What is PHP? • How does a PHP script work with a Web Browser and a Web Server? • What software and components you need to get started with PHP? • To create and run a simple PHP script CS346 PHP

  3. What Is PHP? • PHP, PHP Hypertext Preprocessor • Server-side scripting languages for creating dynamic web pages CS346 PHP

  4. PHP advantages Advantages of Using PHP to enhance Web pages: • Easy to use • Simpler than Perl • Open source • Multiple platform. CS346 PHP

  5. How PHP Pages are Accessed and Interpreted Client: Web browserWeb server 1.Form submitted with a submit button 2.----- Action sends a request to the php file in server 3. Receive the request, find the file, and read it 4. Execute the PHP commands 5. Send the results back 6. ---- results returned as HTML file 7. Web browser renders the HTML file, displaying the results CS346 PHP

  6. Getting Started with PHP To develop and publish PHP scripts you need: • A Web server with PHP built into it • A client machine with a basic text editor and Internet connection • FTP or Telnet software CS346 PHP

  7. WHH Note • This means that a browser e.g. IE or Firefox on the client computer will not recognize or render a file with extension .php CS346 PHP

  8. Getting Started with PHP • For class demos: • Laptop contains a server and a browser environment • Web server is WAMPserver • Windows Apache, MySQL, PHP • Client machine: PC, XP, editors, browsers • Internet connection not needed • Use copy and paste to transfer the scripts CS346 PHP

  9. Exploring the Basic PHP Development Process The basic steps you can use to develop and publish PHP pages are: 1. Create a PHP script file and save it to a local disk 2. Use FTP to copy the file to the server 3. Access your file via URL using a browser • IE, Netscape, Opera, etc. CS346 PHP

  10. Check PHP installation • Create a simple PHP script, called checkphp.php • The PHP script starts with a <?php tag and ends with ?> • Between these tags is a single PHP statement: phpinfo() • Copy the file to a directory of server • For WAMP: wamp/www • Access the file with a browser • http://localhost/checkphp.php CS346 PHP

  11. CS346 PHP

  12. Creating a PHP Script File • Create a simple PHP script, called welcome.php • The PHP script starts with a <?php tag and ends with ?> • Between these tags is a single PHP print statement • Copy the file to C:\wamp\www • Access the file with http://127.0.0.1/welcome.php • demo CS346 PHP

  13. Alternative PHP Delimiters • You can alternatively start your PHP scripts with the <script> tag as follows: <script language="PHP"> print ("A simple initial script"); </script> • If short_open_tagenabled in its configuration file (php.ini), you can use <? and ?>. • If asp_tags is enabled in the PHP configuration file, you can use <% and %> as delimiters. CS346 PHP

  14. Copying Files To A Web Server with FTP 1. Connect to the Internet and start FTP. 2. Connect to your Web server with FTP. 3. Copy files to the Web server. CS346 PHP

  15. Accessing Your File Using a Browser CS346 PHP

  16. Proper Syntax • If you have a syntax error then you have written one or more PHP statements that are grammatically incorrect in the PHP language. • The print statement syntax: CS346 PHP

  17. If syntax is wrong <?php print ( "Welcome to PHP, CS346 class!); ?> CS346 PHP

  18. A Little About PHP's Syntax • Some PHP Syntax Issues: • Be careful to use quotation marks, parentheses, and brackets in pairs. • Most PHP commands end with a semicolon (;). • Be careful of case. • PHP ignores blank spaces. CS346 PHP

  19. Embedding PHP Statements Within HTML Documents • One way to use PHP is to embed PHP scripts within HTML tags in an HTML document. • Save the file with extension php CS346 PHP

  20. 1. <html> 2. <head> 3. <title>HTML With PHP Embedded</title> </head> 4. <body> 5. <font size=5 color=”blue”>Welcome To My Page</font> 6. <?php 7. print ("<br> Using PHP is not hard<br>"); 8. ?> 9. and you can learn to use it quickly! 10. </body></html> CS346 PHP

  21. When embedded1.php is accessed CS346 PHP

  22. Using Backslash (\) to Generate HTML Tags with print() • Sometimes you want to output an HTML tag that also requires double quotation marks. • Use the backslash (“\”) character to signal that the double quotation marks themselves should beoutput:print ("<font color=\"blue\">"); • The above statement would output: <font color="blue"> CS346 PHP

  23. Using Comments with PHP Scripts • Comments enable you to include descriptive text along with the PHP script. • Comment lines are ignored when the script runs; they do not slow down the run-time. • Comments have two common uses. • Describe the overall script purpose. • Describe particularly tricky script lines. CS346 PHP

  24. Using Comments with PHP Scripts • Comment Syntax - Use // standalone <?php // This is a comment ?> • Can be placed on Same line as a statement: <?php print ("A simple initial script"); //Output a line ?> CS346 PHP

  25. Example Script with Comments 1. <html> <head> 2. <title> Generating HTML From PHP</title> </head> 3. <body> <h1> Generating HTML From PHP</h1> 4. <?php 5. // 6. // Example script to output HTML tags 7. // 8. print ("Using PHP has <i>some advantages:</i>"); 9. print ("<ul><li>Speed</li><li>Ease of use</li> <li>Functionality</li></ul>"); //Output bullet list 10. print ("</body></html>"); 11. ?> CS346 PHP

  26. Alternative Comment Syntax PHP allows a couple of additional ways to create comments. <?php phpinfo(); # This is a built-in function ?> • Multiple line comments. <?php /* A script that gets information about the PHP version being used. */ <? phpinfo(); ?> CS346 PHP

  27. Summary • HTML pages are static and cannot interact with users • PHP is a free, open source technology that enables documents to generate dynamic content • PHP script has the extension of .php • PHP script may be standalone or • Can be embedded in an HTML document CS346 PHP

  28. Summary • Resources needed: • Web server with built-in PHP • a client machine with a basic text editor, browser, and internet connections • FTP or Telnet software to send the script to the server CS346 PHP

  29. Summary • PHP script process: • write the PHP script file • copy the script file to the Web server • access the file with a Web browser • Comments can be proceeded with • two forward slashes (//) • or # • or enclosed in /* and */ CS346 PHP

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