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Intro to PHP

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PHP is a widely used scripting language suited for web development. It allows embedding code directly into HTML pages to create dynamic web content by outputting the results of scripts. PHP code can easily access and manipulate databases like MySQL to build rich web applications. For example, a simple PHP script can connect to a MySQL database, execute queries to retrieve rainfall data, and display the results in an HTML table on a web page.

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Intro to PHP Carl-Erik Svensson
What is PHP? PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML* *Source: http://www.php.net
Why Use PHP? Simple, yet powerful scripting tool Easily format and display database information It is popular Image Source: http://www.securityspace.com/s_survey/data/man.200709/apachemods.html
The Basics
The Results Output from a script goes directly into the HTML that is parsed This is what is meant by a ‘dynamic’ webpage
Some Syntax Generally C-like Variables are not strongly typed
Web Applications Form processing Database manipulation Blogs Forums Facebook
PHP + MySQL = Sweet MySQL is an open source database software solution Enables rich web applications when combined with PHP Image Source: http://www.mysql.com/
Rainfall Application Read the contents of a database Get the rainfall data Parse the results Display it
Connecting to a Database PHP Has a set of functions that can be used with MySQL First step is to setup a link to the desired database
Making a Query Once a link is established, querying is easy Errors for any given function are returned by mysql_error()
MySQL Result Set The value returned by mysql_query() is a reference to an internal data structure It can be parsed by various functions
Associative Arrays An array that can be indexed by a string A set of key->value pairs Very similar to a hash in Perl
PHP foreach Similar to the Perl equivalent Allows iterating through each element of an array
Put it All Together
 
The Results http://128.174.242.224/PHPExamples/rainfall.php
A Slight Improvement This was not the exact code we came up with I added some titles and a neat trick Highlight every other row in the table This makes information more readable
 
Samples USGS Example Rainfall EC Awards Committee Scholarship Database
What Else Can PHP Do? Command line scripting Desktop applications Anything
Links PHP.net PHP Manual MySQL

More Related Content

Intro to PHP

  • 1. Intro to PHP Carl-Erik Svensson
  • 2. What is PHP? PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML* *Source: http://www.php.net
  • 3. Why Use PHP? Simple, yet powerful scripting tool Easily format and display database information It is popular Image Source: http://www.securityspace.com/s_survey/data/man.200709/apachemods.html
  • 5. The Results Output from a script goes directly into the HTML that is parsed This is what is meant by a ‘dynamic’ webpage
  • 6. Some Syntax Generally C-like Variables are not strongly typed
  • 7. Web Applications Form processing Database manipulation Blogs Forums Facebook
  • 8. PHP + MySQL = Sweet MySQL is an open source database software solution Enables rich web applications when combined with PHP Image Source: http://www.mysql.com/
  • 9. Rainfall Application Read the contents of a database Get the rainfall data Parse the results Display it
  • 10. Connecting to a Database PHP Has a set of functions that can be used with MySQL First step is to setup a link to the desired database
  • 11. Making a Query Once a link is established, querying is easy Errors for any given function are returned by mysql_error()
  • 12. MySQL Result Set The value returned by mysql_query() is a reference to an internal data structure It can be parsed by various functions
  • 13. Associative Arrays An array that can be indexed by a string A set of key->value pairs Very similar to a hash in Perl
  • 14. PHP foreach Similar to the Perl equivalent Allows iterating through each element of an array
  • 15. Put it All Together
  • 16.  
  • 18. A Slight Improvement This was not the exact code we came up with I added some titles and a neat trick Highlight every other row in the table This makes information more readable
  • 19.  
  • 20. Samples USGS Example Rainfall EC Awards Committee Scholarship Database
  • 21. What Else Can PHP Do? Command line scripting Desktop applications Anything
  • 22. Links PHP.net PHP Manual MySQL

Editor's Notes

  1. Note how the php is embedded directly in the HTML All php code is enclosed within the tag <?php ?> Echo function prints out a string to the output stream In this case the output stream is the actual HTML document
  2. * Note that all variables begin with a $ sign, even arrays and objects
  3. Now that we know the basics, lets see what we can do
  4. Facebook uses mysql Being open source has many advantages - continually improving, highly available, free (mostly)