1. INFO 344 Web Tools And Development CK Wang University of Washington Spring 2014

2. Why PHP?

3. #1 Server-side language http://w3techs.com/technologies/overview/programming_language/all PHP is used by 81.6% of all the websites whose server-side programming language we know.

4. Very Productive & Popular https://gist.github.com/paulmillr/2657075/ > 230 followers Top contributors are PHP devs

5. It’s FREE. Open Source Stack Low barrier to entry. Download LAMP/WAMP, start now!

6. But…

7. It’s SLOW! http://www.lornajane.net/posts/2012/php-5-4-benchmarks It’s getting faster and faster Time to run benchmark script

8. Scalability, Enterprise-ready? Facebook is written in PHP HipHop for PHP Also Drupal/Wordpress

9. More Information http://www.acquia.com/blog/why-php-real

10. Open PHP in the Browser Homework = use Eclipse, but we will use this online compiler for lecture http://www.compileonline.com/execute_php_online.php

11. What is PHP? (Recursive acronym) PHP: Hypertext Preprocessor Originally Personal Homepage

12. Scripting language Originally PHP interpreter (like javascript) Now = compiled to bytecode (like java) Cross-platform! Script = no persistent memory My favorite part of PHP: End of script = everything is erased PHP code Bytecode Apache Compile at run time Run at run time

13. Server-side language Compiled & executed on Server Client does not see code ex: Javascript is client-side

14. index.php Default page!

15. Data Types $myBool = TRUE; $myInt = 10; $myWord = "hello world"; $myArray = array("ice cream", "steak", "apples"); $myArray[0] // ice cream $myKeyValuePair = array("Dad" => "Joe", "Mom" => "Amy", "Bro" => "Jason"); $myKeyValuePair['Dad'] // Joe

16. Dynamic, loosely typed language Loosely typed (vs. strong typed) “10” + 1 => 11 javascript => 101 C/C++ => ERROR!!! Dynamic typed (vs. static) $temp => from int to array C/C++ => ERROR!!! Cause of perf issues

17. == and === are different!!

18. Single Quote vs. Double Quote

19. For, While, Foreach (loops) Same as other languages Foreach => great for associative arrays (key/value pair) What if we want to use for loop to access associative arrays? Answer = Search on Google! “php array keys”

20. PHP manual is your best friend http://www.php.net/manual/en/index.php

21. Classes, Objects, Functions Class method/function call Class variable/member variable Default Public (unlike C++ default is Private) Protected = can be seen by subclass Property (method for variable, allows public read, private write) Parameters for function calls ex: toUpper($word) No type! Not like C++! Static Functions, use ::

22. Other PHP constructs $_REQUEST => get/post request form params require_once("file.php"); // #include, import isset($_REQUEST['id']) || die('missing id'); echo // cout, System.printout.ln var_dump() // must use during dev

23. Connecting to MySQL Hint: Search on google for PDO in PHP More details in next topic “Intro to Databases” Wanted to note here incase you’re starting PA1 this weekend