![History of World Wide Web[1] “ A global hypertext space is created in which any network-accessible information could be referred to by a single Universal Document Identifier which was later called WorldWideWeb , a point and click hypertext editor which ran on the NeXT machine”. - Tim Berners-Lee](https://image.slidesharecdn.com/internettechnologyandapplications-100129022853-phpapp02/85/Internet-Technology-and-its-Applications-4-320.jpg)
![$arr = array(5 => 1, 12 => 2);//hash list foreach ($arr as $key => $value) { $colors[$key] = strtoupper($value); } Sorting an array sort($arr); print_r($arr);](https://image.slidesharecdn.com/internettechnologyandapplications-100129022853-phpapp02/85/Internet-Technology-and-its-Applications-25-320.jpg)
![Form Handling $_GET and $_POST variables $_GET[“varname”]; $_POST[“varname”];](https://image.slidesharecdn.com/internettechnologyandapplications-100129022853-phpapp02/85/Internet-Technology-and-its-Applications-29-320.jpg)
![References [1] Tim Berners-Lee, “The World Wide Web: A very short personal history”, http://www.w3.org/People/Berners-Lee/ShortHistory.html [2] PHP manual, http://php.net/manual/en/index.php [3] http://tinman.cs.gsu.edu/~raj/4998/sp06/mysql-php/w3_c12.ppt](https://image.slidesharecdn.com/internettechnologyandapplications-100129022853-phpapp02/85/Internet-Technology-and-its-Applications-30-320.jpg)
Internet Technology and its Applications
- 1. Internet Technology & its Applications Prof. Ami Tusharkant Choksi CKPCET, Surat.
- 2. What is Internet Technology? Technology with internet can provide applications, information for internet users. First thing come to our minds with internet is web. i.e. www (world wide web)
- 3. Applications integration of e-business models with front and back office development of an intranet for your employees development of an extranet for your customers development of a web shop implementation of content management systems e-mail marketing implementation of online payment systems
- 4. History of World Wide Web[1] “ A global hypertext space is created in which any network-accessible information could be referred to by a single Universal Document Identifier which was later called WorldWideWeb , a point and click hypertext editor which ran on the NeXT machine”. - Tim Berners-Lee
- 5. Requirements To run WWW Programs HTML (HyperText Markup Language) URL (Universal Resource Locator) HTTP (Hyper Text Transfer Protocol) Web Server (Apache, Tomcat, GlassFish, WebLogic, etc.) Web application programming languages ( P re H ypertext P rocessor, Java Servlet, J ava S erver P ages, C ommon G ateway I nterface/perl, A ctive S erver P ages, JScipt/JavaScript, VBScript, e X tensible M arkup L anguage )
- 6. What's server side and client side progg. Languages? Programs which runs on server is called server side progg . Programs which runs on client is called client side progg .
- 7. Server Side Progg. vs. Client Side Progg. Server Side Progg. Programs which runs on server Compiler/Interpreter for programs needed at client PHP, JSP, ASP, Java Servlet, CGI/perl etc. Slower Applications: Authentication, Authorization Client Side Progg. Programs which runs on client Compiler/Interpreter for programs needed at client JavaScript, Jscript, Vbscript, HTML, XML Faster Applications: Validation of forms done
- 8. P re H ypertext P rocessor Opensource product Form handling, file processing, and database access Server side scripting language PHP processor has two modes: copy (XHTML) interpret (PHP) Purely Interpreted PHP can be used as Server-side scripting Command line scripting Writing desktop applications
- 9. Simple PHP Program (first.php) <html> <body> <?php echo “hi and welcome to the world of PHP”; phpinfo(); ?> </body> </html>
- 10. Configure Apache For PHP
- 11. /etc/httpd/conf/httpd.conf #Use for PHP 5.x: LoadModule php5_module modules/libphp5.so AddHandler php-script php # Add index.php to your DirectoryIndex line: DirectoryIndex index.html index.php AddType text/html php AddType application/x-httpd-php .php AddType application/x-httpd-php-source .phps Add input/output filters (older versions of Apache, in new versions following code will give error of “an unknown filter was not added: PHP” ) <Files *.php> SetOutputFilter PHP SetInputFilter PHP LimitRequestBody 9524288</Files>
- 12. /etc/httpd/conf/httpd.conf If with user's home directory we want to access <IfModule mod_userdir.c> #UserDir disabled # To enable requests to /~user/ to serve the user's public_html # directory, remove the "UserDir disabled" line above, and uncomment the following line instead: UserDir public_html </IfModule>
- 13. /etc/httpd/conf/httpd.conf <Directory /home/*/public_html> AllowOverride FileInfo AuthConfig Limit Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec <Limit GET POST OPTIONS> Order allow,deny Allow from all </Limit> <LimitExcept GET POST OPTIONS> Order deny,allow Deny from all </LimitExcept> </Directory>
- 14. Deploy program on webserver Restart apache web server /etc/rc.d/init.d/httpd restart OR Service httpd restart Login as ami(user) mkdir public_html Put first.php in /home/ami/public_html dir chmod -R o+rx /home/ami/* chmod o+rx /home/ami chmod o+rx /home Check in browser http://localhost/~ami/first.php
- 15. If u have root previllages In /etc/httpd/conf/httpd.conf check for DocumentRoot Generally DocumentRoot is /var/www/html Put the first.php file in /var/www/html dir Set permission of first.php as o+rx Run in browser as http://localhost/first.php
- 16. Comments in PHP // this is a comment # shell script like comment /* C and java-like comments */
- 17. Primitives, Operations, and Expressions - No type declarations of variable - Variable can be used as $var - An unassigned (unbound) variable has the value, NULL - The unset function sets a variable to NULL - The IsSet function is used to determine whether a variable is NULL - error_reporting(15); - prevents PHP from using unbound variables - list predefined variables, including the environment variables of the host OS with phpinfo() in a script
- 18. There are eight primitive types: - Four scalar types: Boolean, integer, double, and string - Two compound types: array and object - Two special types: resource and NULL - Integer & double are like those of other languages - Strings - Characters are single bytes - String literals use single or double quotes
- 19. - Single-quoted string literals (as in Perl) - Embedded variables are NOT interpolated - Embedded escape sequences are NOT recognized - Double-quoted string literals (as in Perl) - Embedded variables ARE interpolated - Boolean - values are true and false (case insensitive) - 0 and "" and " 0 " are false; others are true
- 20. Operators As in 'C' language e.g.+, -, *, /, % String Functions strlen , strcmp , strpos , substr , as in C chop – remove whitespace from the right end trim – remove whitespace from both ends ltrim – remove whitespace from the left end strtolower , strtoupper
- 21. Type Conversion $a = (int)$b; intval($total) settype($total, " integer " ) The type of a variable can be determined with gettype or is_type gettype($total) - it may return " unknown " is_integer($total) – a predicate function - echo/print/prinf used for print
- 22. Control Statements Control Expressions - Relational operators - same as JavaScript, (including === and !== ) - Boolean operators - same as Perl (two sets, && and and , etc.) - Selection statements - if , if - else , elseif - switch - as in C - The switch expression type must be integer, double, or string - while - just like C - do - while - just like C - for - just like C
- 23. -foreach (array_expression as $value) statement foreach (array_expression as $key => $value) statement - break - in any for , foreach , while , do - while , or switch - continue - in any loop - Alternative compound delimiters – more readability if(...): ... endif;
- 24. Arrays An array in PHP is an ordered map. A map is a type that associates values to keys. list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue,etc. $arr = array(1, 2, 3, 4, 5);//simple list Can be accessed with foreach foreach ($arr as $i){ echo $i; }
- 25. $arr = array(5 => 1, 12 => 2);//hash list foreach ($arr as $key => $value) { $colors[$key] = strtoupper($value); } Sorting an array sort($arr); print_r($arr);
- 26. Sorting Arrays rsort - To sort the values of an array into reverse order - ksort - To sort the elements of an array by the keys, maintaining the key/value relationships e.g., $list("Fred" => 17, "Mary" => 21, "Bob" => 49, "Jill" => 28); ksort($list); // $list is now ("Bob" => 49, "Fred" => 17, "Jill" => 28, "Mary" => 21) - krsort - To sort the elements of an array by the keys into reverse order
- 27. User Defined Functions Syntactic form : function function_name ( formal_parameters ) { … } - General Characteristics - Functions need not be defined before they are called (in PHP 3, they must) - Function overloading is not supported - If you try to redefine a function, it is an error - Functions can have a variable number of parameters - Default parameter values are supported - Function definitions can be nested - Function names are NOT case sensitive - The return function is used to return a value; If there is no return , there is no returned value
- 28. Example <?php $sum=add(15,20); echo "sum : $sum <br>\n"; function add($no1,$no2) { return ($no1+$no2); } ?>
- 29. Form Handling $_GET and $_POST variables $_GET[“varname”]; $_POST[“varname”];
- 30. References [1] Tim Berners-Lee, “The World Wide Web: A very short personal history”, http://www.w3.org/People/Berners-Lee/ShortHistory.html [2] PHP manual, http://php.net/manual/en/index.php [3] http://tinman.cs.gsu.edu/~raj/4998/sp06/mysql-php/w3_c12.ppt