New Stuff In Php 5.3
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This document summarizes new features in PHP 5.3 including backward incompatible changes, deprecations, new functions, namespaces, late static bindings, anonymous functions, and more. Key changes include object casting using _toString(), reserved words like "goto" and "namespace", improved error handling, date/time functions becoming objects, namespace usage, late static bindings with self and static, anonymous functions, and new string and constant declarations.
![What's New In PHP 5.3 Chris Chubb, Code Gurus www.codegurus.com [email_address]](https://image.slidesharecdn.com/newstuffinphp5-3-090921135931-phpapp01/85/New-Stuff-In-Php-5-3-1-320.jpg)
![Backward Incompatible Changes Object._toString() used for string casting everywhere, so you can override it, in fact you MUST if you want to use it for any place you may treat an object like a string, like in an echo DEBUG statement. Objects still can't be indices of arrays though, for that you must provide your own unique instance hash or call spl_object_hash(), even if you know it's unique. (Or fake it out with an explicit string cast: $array[(string)$object]) realpath() is now fully platform independent.](https://image.slidesharecdn.com/newstuffinphp5-3-090921135931-phpapp01/85/New-Stuff-In-Php-5-3-5-320.jpg)
New Stuff In Php 5.3
- 1. What's New In PHP 5.3 Chris Chubb, Code Gurus www.codegurus.com [email_address]
- 2. Migrating from PHP 5.2.x to PHP 5.3.x http://us.php.net/manual/en/migration53.php
- 3. See other guides for 4.x -> 5 or 5.1 -> 5.2
- 4. Some of these items are things that are new to 5.2, but of interest because 5.3 has modified their implementation.
- 5. Backward Incompatible Changes Object._toString() used for string casting everywhere, so you can override it, in fact you MUST if you want to use it for any place you may treat an object like a string, like in an echo DEBUG statement. Objects still can't be indices of arrays though, for that you must provide your own unique instance hash or call spl_object_hash(), even if you know it's unique. (Or fake it out with an explicit string cast: $array[(string)$object]) realpath() is now fully platform independent.
- 6. Deprecations (2) You must now specifically cast objects as an array to use them in the array sort functions. (Do this anyway...)
- 7. magic methods __get, __set, __isset, __unset, and __call must always be public and can no longer be static.
- 8. The __call magic method is now invoked on access to private and protected methods. (Not just public any more. Self __call)
- 9. Deprecations (2) Oracle extension now requires at least Oracle 10. (I think this is a bad idea, too many legacy Oracle installations)
- 10. 'goto' and 'namespace' are now reserved words. Do a string search in your code. More on these later
- 11. New stuff Many new more descriptive error messages, especially with class handling.
- 12. Date object moved into the core, and all supporting functions have also become objects. Timezone is inspected more for intervals, etc.
- 13. Functions with new optional parameters http://us.php.net/manual/en/migration52.parameters.php
- 14. Highlights: datetime can now do milliseconds in the format
- 15. cookie functions take "httponly" so they can't be accessed by XSS attacks.
- 16. xmlreader now lets you set the encoding directly for reading. No more stream encoding manually.
- 18. Highlights: error_get_last - Just get the last error info as an assoc array
- 19. Multibyte string handling functions. For you UTF-8 guys.
- 21. Use to encapsulate classes and variables to prevent naming collisions on large projects.
- 22. Namespaces are declared using the namespace keyword. A file containing a namespace must declare the namespace at the top of the file before any other code - with one exception: the declare keyword. No non-PHP code either, so don't use it with embedded PHP.
- 23. Sub-namespace with backslashes: namespace MyProject\Sub\Level;
- 24. Namespaces (2) Namespaces may be single-line versions:
- 25. namespace ThisNamespace; //Continue to end of file or next namespace directive
- 27. namespace ThisNamespace { //Put your classes and variables in here }
- 28. Global namespace code may be put in a unnamed bracketed section.
- 29. namespace { //Global code }
- 30. Namespaces (3) Reference namespace using directory-like naming. Use single backslash to call a global function, even if a local function of the same name exists.
- 31. 'use' will import a namespace into the current namespace and the 'as' clause can be used to alias it.
- 32. Note: Nested namespaces are not allowed.
- 33. Note: Cannot create local versions of the constants NULL, TRUE or FALSE. Do not "define(TRUE, 0);" for you jokers out there.
- 34. Late Static Bindings http://us.php.net/manual/en/language.oop5.late-static-bindings.php
- 35. "self::" - Static references to the current class like self:: or __CLASS__ are resolved using the class in which the function belongs, as in where it was defined
- 36. "static::" - Replaces reference with run-time definition, so a subclass instance will use the current child class instead of the parent class.
- 37. Goto Operator === Evil goto a; echo 'Foo'; a: echo 'Bar';
- 38. Enough said.
- 39. Anonymous Functions (Closures) http://us.php.net/manual/en/functions.anonymous.php
- 40. Use an unnamed function as the parameter for a callback function to keep code readable and not worry about namespace collisions.
- 41. Can also assign an anonymous function to a variable and call like "$function($param);"
- 42. Anon functions may inherit certain variables from their parent "calling" stack with the "use" operator.
- 43. Two new "magic" functions __invoke When an object is being called like a function. __callStatic Like __call but for inaccessible static functions.
- 44. NEWDOC String Declaration Like Heredoc, but treated like a single quoted string. No parsing. $string=<<'ENDOFSTRING' Blah "costs" $20.00 ENDOFSTRING; Heredoc may now be defined with double quotes. I recommend this to increase readability.
- 45. Const Declaration You can now use "const" outside of a class as a synonym of "define".