1. PHP - 1h

2. How it works Client requests document Server loads document in memory Server processes document with relevant module (PHP) Server sends XHTML document to client Client displays document

3. Hello World!

4. Output 1 Hello World

5. Output 2 Hello World

6. PHP Syntax basics PHP code embedded in Files containing PHP code must have a.php extension (or php3, etc) Syntax very similar to C and Java –Comments as in C/Java: /* comment */ // comment –But also: # comment

7. PHP Syntax basics Syntax very similar to C and Java –Statements delimited by ; Variables preceded by $, for example: –$x = 2; –$first_name = joe;

8. Data types Integer – for whole numbers Float – for real numbers String – for strings of characters Boolean – for true or false values Array – For collections of data Object – For OO programming

9. Strings <?php $first_name = ‘John’; $last_name = ‘Doe’; echo $first_name; ?> Output: John

10. Strings <?php $first_name = ‘John’; $last_name = ‘Doe’; echo ‘$first_name’; ?> Output: $first_name

11. Strings <?php $first_name = ‘John’; $last_name = ‘Doe’; echo “$first_name”; ?> Output: John

12. Strings <?php $first_name = ‘John’; $last_name = ‘Doe’; echo "You said: \"my name is $first_name $last_name\"";?> Output: You said: “my name is John Doe”

13. Strings <?php $first_name = ‘John’; $last_name = ‘Doe’; echo $first_name{0}; ?> Output: J

14. Strings <?php $first_name = ‘John’; $last_name = ‘Doe’; echo substr('abcdef', 1, 4); ?> Output: bcde

15. Strings <?php $first_name = ‘John’; $last_name = ‘Doe’; echo substr($first_name, 0, 6); ?> Output: ??? you tell me!!

16. Integers and Floats <?php $a = 1234; $b = 12.02; ?> Integer type: http://uk.php.net/manual/en/language.types.integer.php Float type: http://uk.php.net/manual/en/language.types.float.php

17. Boolean Logical operators: –And: && –Or: ¦¦ –Not: ! Boolean type: http://uk.php.net/manual/en/language.types.boolean.php

18. Array idFirst NameLast NameJob 1JoeSmithSurgeon 2JohnJohnsonNurse 3JackJacksonConsultant 4JimJonesIT

19. Numerically indexed array <?php $names = array(‘Joe’, ‘John’, ‘Jack’, ‘Jim’ ); echo $names[1]; ?> Output: John

20. if, else, elseif <?php $value = 24; if ($value < 20) echo “not enough!”; elseif ($value < 30) echo “reasonable.”; elseif ($value < 40) echo “ok!”; else echo “Too much!”; ?>

21. switch <?php switch ($value){ case 24: echo "Correct!"; break; case 25: echo "Almost correct!"; break; default: echo "Too much!"; }?>

22. for <?php for ( ; ; ) { } ?> ($i = 1$i <= 10 $i++ echo $i; Output: 12345678910

23. for <?php for ($i = 1; $i <= 10; $i++) { echo $i; } ?> Output: 12345678910

24. foreach <?php $arr = array("one", "two", "three"); echo "Using a for loop: \n"; for ($i = 0; $i < sizeof($arr); $i++) { echo "Value: $arr[$i] \n"; } echo "Using a foreach loop: \n"; foreach ($arr as $value) { echo "Value: $value \n"; } ?>

25. while <?php $i = 1; while ($i <= 10) { echo $i i++; } Output: 12345678910