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Php

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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 = "This is a test string."; $this->ParentObject(); } } class ObjTest { var $ObjPointer; function ObjTest() { $tmp = new MemberObject; $this->ObjPointer = $tmp; } } $object = new ObjTest; echo "String Contents: " . $object->ObjPointer->string . "n"; echo "Value Contents: " . $object->ObjPointer->value . "n";
  • 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 = "hello"; $member_name = 'b'; echo $object->$member_name; $object->$member_name = " world"; echo $object->$member_name;
  • 16. Resources  http://www.php.net  http://www.w3schools.com

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