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Php Presentation Transcript

  • 1. PHP Introduction Mohamed Ashraf
  • 2. PHP Hypertext Preprocessor
    • No joke, that’s what it stands for
    • Now very widely used for websites
    • Only three years ago it was considered a risky alternative for development
    • Has a lot of community support
  • 3. Simple PHP
    • PHP is meant to be invoked inline with content
    • Page “escapes” into and out of a regular html document
    • File extension is .php (was .php3 for version 3)‏
    • Initial use was control flow and simple scripting
  • 4. A quick example
    • <html>
    • <head>Test page</head>
    • <body>
    • The time is now
    • <?php
    • echo date();
    • ?>
    • <hr>
    • </body>
    • </html>
  • 5. A quick example
    • <html>
    • <head>Test page</head>
    • <body>
    • The time is now
    • <?php here we “jump into” php
    • echo date();
    • ?> here we “jump” back out
    • <hr>
    • </body>
    • </html>
  • 6. Another example
    • <?php
    • include “utilities.php”;
    • ?>
    • <html>
    • <head>Test page</head>
    • <body>
    • <?php
    • if ($utils->isFriendly()) {
    • echo “The time is now “ . date();
    • } else {
    • echo “I will not give you the time of day”;
    • }
    • ?>
    • <hr>
    • </body>
    • </html>
  • 7. Another example – harder to read
    • <?php
    • include “utilities.php”;
    • ?>
    • <html>
    • <head>Test page</head>
    • <body>
    • <?php
    • if ($utils->isFriendly()) {
    • echo “The time is now “ . date();
    • } else {
    • ?>
    • <i>I will not give you the time of day!</i>
    • <?php
    • }
    • ?>
    • <hr>
    • </body>
    • </html>
  • 8. More PHP language details
    • Variables are implicitly typed
      • This is good
      • This is bad
    • Variables start with $
    • All get/post variables automatically defined
      • With most default server settings
      • With an inline directive if need be
  • 9. Defined variable example
    • foo.html:
    • <html><head></head><body>
    • <form submit=“getFoo.php”>
    • Enter your name:
    • <input type=“text” name=“username”>
    • <input type=“submit”>
    • </body></html>
    • getFoo.php:
    • <html><head></head></body>
    • Your name is
    • <?php
    • if (!strcmp($username)) {
    • echo $username;
    • } else {
    • echo “not given”;
    • }
    • ?>
    • !<br>
    • </body></html>
  • 10. Function list examples
    • http://www.php.net/manual/en/function.strlen.php
      • All string functions
      • Some are “obvious” to c programmers
        • strlen, printf, fprintf, strpos
      • Some are web tailored
        • htmlentities, htmlspecialchars
      • Others are new (hacky)‏
        • addcslashes, explode, soundex, quotemeta, …
  • 11. Classes
    • OOP
      • Class structures will be defined, helping integration with other apps and work together
      • APIs followed by implementation
    • Inheritance
    • Object serialization
      • “ Magic functions”
  • 12. Class example
    • class Cart
    • {
    • var $items; // Items in our shopping cart
    • // Add $num articles of $artnr to the cart
    • function add_item ($artnr, $num)‏
    • {
    • $this->items[$artnr] += $num;
    • }
    • // Take $num articles of $artnr out of the cart
    • function remove_item ($artnr, $num)‏
    • {
    • if ($this->items[$artnr] > $num) {
    • $this->items[$artnr] -= $num;
    • return true;
    • } else {
    • return false;
    • }
    • }
    • }
  • 13. Inheritance example
    • Class ParentObject {    var $value;   function ParentObject() {        $this->value = 42;   } } class MemberObject extends ParentObject {    var $string;    function MemberObject() {       $this->string = &quot;This is a test string.&quot;; $this->ParentObject();   } } class ObjTest {    var $ObjPointer;   function ObjTest() {        $tmp = new MemberObject; $this->ObjPointer = $tmp;   } } $object = new ObjTest; echo &quot;String Contents: &quot; . $object->ObjPointer->string . &quot; &quot;; echo &quot;Value  Contents: &quot; . $object->ObjPointer->value . &quot; &quot;;
  • 14. Back to being hacky…
    • “ ->” is NOT the same thing as it is in c++
      • No pointers in PHP
      • ONLY a member operator
    • Oh, you wanted pointers?
      • Variable variables
        • Yeah, you heard right
          • Don’t get me started…
  • 15. Variable variables and classes example
    • class a { var $b; } $object = new a; $object->b = &quot;hello&quot;; $member_name = 'b'; echo $object->$member_name; $object->$member_name = &quot; world&quot;; echo $object->$member_name;
  • 16. Resources
    • http://www.php.net
    • http://www.w3schools.com