Learning php 7
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The document provides an overview of PHP 7, highlighting its release history, key improvements, and breaking changes compared to earlier versions. It discusses the removal of deprecated functions, introduction of new features like scalar type hints, null coalescing operator, and how PHP errors are now treated as exceptions. It also includes a personal insight from the author, who has been programming in PHP since 2001 and maintains a programming blog.
Learning php 7
- 1. E D L O M O N A C O G R D E V D A Y 2 0 1 6 Learning PHP 7
- 2. About Me Work At Terryberry Started PHP programming in 2001 PHP 4.1 was the latest release I’ve Since Learned C# & Java PHP is still my favorite programming language I have a programming blog Eman's Programming Hub http://emansprogramminghub.blogspot.com
- 3. Quick History Recap PHP 4 was released in 2000 PHP 5 was released in 2004 PHP 6 Got caught up in disputes PHP group fought about Unicode support PHP 6 dissolved shortly after PHP 7 was released December 2015
- 4. Why PHP 7? PHP 6 has too much baggage Most of what PHP 6 was going to offer got added in future PHP 5 releases PHP 6 is considered an experimental release PHP 7 just made sense
- 5. PHP 7 Highlights 64-Bit Windows Support 64-bit support in the past was considered experimental Lots of depreciated functions are gone Most of them were considered deprecated back in PHP 5 Old APIs & extensions are gone as well
- 6. PHP 7 Highlights New Zend engine (PHPNG) PHP operates twice as fast with better memory handling
- 9. H O W W I L L P H P 7 B R E A K M Y L E G A C Y C O D E ? Breaking Changes
- 10. Breaking Changes E_STRICT has been reclassified The constant is still available to avoid breaking legacy code
- 11. Breaking Changes ASP-Style & Script tags are no longer supported All ereg functions are gone ereg was deprecated a while ago and using preg_* is recommended Various database-specific functions are gone mysql mssql list function cannot be empty It can’t be used to unpack string variables, use str_split() The ordering of assignment has been reversed
- 12. Breaking Changes global only accepts simple variables Variable variables can only be used if wrapped around curly braces; that is discouraged however. foreach will not change the array pointer Hexadecimal strings are no longer considered numeric
- 13. Breaking Changes Various mcrypt functions are removed mcrypt_generic_end() ; mcrypt_generic_deinit() is preferred mcrypt_ecb(), mcrypt_cbc(), mcrypt_cfb() and mcrypt_ofb() mcrypt_decrypt() with the appropriate MCRYPT_MODE_* constant. GD Type1 functions are removed Using TrueType fonts and their associated functions is recommended instead.
- 14. Breaking Changes New objects can no longer be assigned by reference Was depreciated in PHP 5 Non-static methods cannot be called as static Was depreciated in PHP 5.6 $HTTP_RAW_POST_DATA is removed php://input is the recommended method JSON has been replaced with JSOND Numbers cannot end with decimal point
- 15. Breaking Changes Functions can’t have similar-named variables Will throw an E_COMPILE_ERROR Switch statement can’t have multiple default blocks Will throw an E_COMPILE_ERROR PHP 4 style constructors are depreciated Division by zero will now return either NAN or float Used to return boolean
- 16. Uniform Variable Syntax Uniform Variable Syntax is an effort to making PHP more consistent. It’ll be read strictly left to right from now on.
- 17. H O W C A N I M A K E M Y C O D E M O R E A W E S O M E W I T H P H P 7 ? New Features
- 18. Scalar Type Hints & Return Types You can now tell a function or method what it should accept and return int bool string float Type hinting is non-strict by default declare(strict_types=1); will make type hinting strict
- 19. Null Coalescing Operator Ternary on steroids. Useful for when using isset() Null Coalescing can be chained Will return the first defined value
- 20. Combined Comparison Also known as the Spaceship Operator Used to compare two expressions It’ll return -1, 0, or 1 -1 => The leftmost value is smaller 0 => Both values are equal 1 => The leftmost value is greater Can be used with any type
- 21. Unicode Escape Syntax Allows you to enter Unicode character code inside PHP string Hexidecimal format
- 22. Bind Closure on Call Shorthand to Closure->bindTo()
- 23. Group Use Declarations Allows for a cleaner way to grab multiple objects from similar namespace Can be applied to the following: Methods Constants Class
- 24. Throwable PHP Errors are now exceptions Allows you to better control how to use the error provided Was known as EngineException during development EngineException replaced with Throwable in PHP 7 alpha 2 Throwable is the base interface that all errors reference Exceptions are also connected to Throwable
- 25. Anonymous Classes Like a regular PHP Class but anonymous C# & Java already do this Best suited for one-time processes You can inherit interfaces & classes
- 26. Questions?