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PHP - Hypertext Preprocessor

PHP, or Hypertext Preprocessor, is a server-side, cross-platform scripting language designed for creating dynamic web pages. Developed in 1994 by Rasmus Lerdorf, PHP has grown in popularity due to its exceptional features, including a short learning curve, quick development time, and high performance. PHP supports major platforms like UNIX and Windows, offering native support for popular databases. Its history includes significant milestones, and it empowers developers to tackle complex scenarios efficiently. From form handling to database connectivity, PHP remains a cornerstone of modern web development.

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PHP - Hypertext Preprocessor

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  1. PHP - Hypertext Preprocessor Yaron Benita De Paul University

  2. PHP • Introduction • History • Language syntax • Advantages

  3. What is PHP An established server-side, cross-platform embedded HTML scripting language for creating dynamic Web pages. PHP provides many features that commercial entities are looking for.

  4. PHP Advantages • Exceptionally short learning curve • Quick development time • Very high performance • supports all major platforms (UNIX, Windows and even mainframes). • Features native support for most popular databases

  5. Intranet Design Magazine "PHP was built with the needs of Web developers in mind... Unlike other cumbersome, overhead-laden approaches, PHP is lightweight and focused on the Web - where it can solve complex problem scenarios quicker and more easily than comparable technologies."

  6. History of PHP • 1994 - PHP was conceived sometimes in the Fall of 1994 by Rasmus Lerdorf • 1995 - PHP/FI Version 2. ( Introducing mySql data base) • 1997 – approximately 50,000 web sites. Introducing PHP Version 3. (Zeev Suraski and Andi Gutmans ) • 2000 – PHP 4 was introduced, using “Zend” scripting engine. ( 5.1 million web sites. )

  7. PHP-Enabled Web Pages • Treated just like regular HTML pages and you can create and edit them the same way you normally create regular HTML pages. • As simple as HTML files with a whole new family of magical tags that let you do all sorts of things.

  8. Simple Example: File name : Hello.php <html><head><title>PHP Test</title></head><body><?php echo "Hello World<p>"; ?></body></html>

  9. PHP Language • Condition statements, loop statements, arrays ... • Built in libraries. (sorting, list, queue..) • Functions. • Classes. ( Objects, Inheritance .. ) • String Manipulation. ( Perl ) • Built in support for encryption/Decryption functions.( MD5, DES, …)

  10. More on PHP Language: • Text files manipulation. ( Read, write, ..) • Supports java objects, COM objects ... • Sessions, cookies …

  11. A More Useful Example • <?php echo $HTTP_USER_AGENT; ?> Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0) • <?php phpinfo(); ?> A list of all the global variables.

  12. Using if Statements <?phpif(strstr($HTTP_USER_AGENT,"MSIE")) {?><center><b>You are using Internet Explorer</b></center><?} else { ?><center><b>You are not using Internet Explorer</b></center><?} ?>

  13. Dealing with Forms • One of the most powerful features of PHP is the way it handles HTML forms • Any form element in a form will automatically result in a variable with the same name as the element being created on the target page.

  14. FORM Example: • HTML Page: <form action="action.php" method="post">Your name: <input type="text" name="name">You age: <input type="text" name="age"><input type="submit"></form> • action.php. Hi <?php echo $name; ?>.You are <?php echo $age; ?> years old.

  15. Database Support • mySQL - PHP and MySQL work very well together, in addition to the speed and features of each individual tool. • PHP is open-source, and offers excellent connectivity to most of today's common databases including Oracle, Sybase, MySQL, ODBC (and others). • PHP also offers integration with various external libraries which enable the developer to do anything from generating PDF documents to parsing XML.

  16. MySQL Example • Connect to MySQL. • Send a query. • Print a table heading. • Print table rows until end of the table has been reached.

  17. MySQL Example <?php $conn = mysql_connect("localhost", “yaron", ""); $res = mysql_query("SELECT * FROM users", $conn); $header_printed = false; print "<TABLE>\n"; do { $data = mysql_fetch_array($res); // Retrieve the next row of data. if (!is_array($data)) {         break;     }

  18. MySQL Example (continue) if (!$header_printed) {         print " <TR>"; reset($data);         while (list($name, $value) = each($data)) {             print "  <TH>$name</TH>\n" }         print " </TR>\n"; $header_printed = true;     }     print " <TR>\n";     print "  <TD>"; print implode("</TD>\n  <TD>", $data);     print " </TR>\n"; } while ($data); print "</TABLE>\n"; ?>

  19. Reasons for Using PHP • Speed and robustness. • Superior Memory Management • No Hidden Costs with PHP • Integration with MySQL database. • Closer to Java/C++ Style of Programming. • No Show Stopper Bugs. • Cross Platform Migration Strategy.

  20. Where to Find More… • PHP Homepage: http://www.php.net • PHP-to-MySQL database tutorial: http://www.devshed.com/ resource/advanced/php3/intro/index.html • Zend.com: http://www.Zend.com/

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