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PHP - 1h

PHP - 1h. 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. Hello World!. <html> <body> <?php echo 'Hello World';?> </body> </html>. Output 1.

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PHP - 1h

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  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! <html> <body> <?php echo 'Hello World';?> </body> </html>

  4. Output 1 <html> <body> Hello World </body> </html>

  5. Output 2 Hello World

  6. PHP Syntax basics • PHP code embedded in <?php … ?> • 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

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

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

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