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Optimizely-Generated Audience for Backwards Compatibility

migrating-a-php5-app-to-php7

## Contents
1. Introduction `4`
    1. PHP5 and PHP7 `4`
2. Upgrading your development environment to PHP7 `6`
    1. Mac OS X `6`
    1. Windows `7`
    1. Ubuntu `7`
    1. Debian `8`
    1. Cent OS / Red Hat Enterprise Linux `8`
    1. phpbrew `9`
    1. Vagrant `11`
        1. Laravel Homestead `11`
        1. phpdev `12`
    1. Valet `12`
    1. Docker `15`
        1. php7-dockerized `15`
        1. Laradock `15`
        1. phpdocker `16`
3. Elementary Language Changes `17`
    1. SpaceShip operator `17`
    1. Array Constants `19` 
    1. Null Coalescing Operator `19`
    1. Integer Division `20`
    1. Regular Expressions `20`
    1. Filtered unserialize() `21`
        1. Cryptographically Secure Pseudorandom Number Generator (CSRPNG) `22`
        1. session_start config enhancements `22`
        1. Unpack objects with list() `22`
        1. dirname() enhacement `23`
        1. Reflection API Enhancements `23`
        1. Reserved Words `24`
4. Scalar Typehinting & Return type declarations `26`
    1. Typehinting `26`
    1. Return Types `27`
    1. Strong types checks `28`
5. Error handling, Expections and Assertions `29`
    1. Expections and Assertions `30`
6. Closures and Generators `32`
    1. Generator return expressions `33`
    1. Generator Delegation `33`
7. Object-oriented Programming enhancement `35`
    1. Anonymous Classes `35`
    1. Group Use Declarations `36`
8. Better Unicode support `37`
    1. IntlChar `38`
9. Deprecated and removed features `39`
    1. Removed extensions and Server APIs `40`
    1. Backward Incompatible changes `41`
10. Uniform Variable syntax and static values `43`
    1. Accessing static values `43`
11. Migration Tools `45`
    1. PHP 7 MAR `45`
    1. PHP 7 Compatibility Checker `46`
    1. Phan `46`
    1. phpto7aid `46`
    1. PhpStorm PHP 7 Compatibility Inspection `46`
12. Practial Migration of two Apps `48`
    1. Building a PHP5 App `48`
        1. Create and configure Auth0 client `48`
        1. Build the App `53`
        1. Run the App `62`
        1. Migrate to PHP 7 `64`
    1. API `64`
        1. Use PHP 7 Features `66`
13. Introducing PHP 7.1 Features `71`
    1. Nullable Types `71`
    1. Void Type `72`
    1. Symmetric Array Destructuring `72`
    1. Class constant visibility `73`
    1. Multi-Catch Exception Handling `73`
    1. Iterables `74`
    1. Keys support in list() `74`
    1. Negative string Offset Support 75
    1. Conversion of Callables to Closures `75`
    1. Asynchronous Signal Handling `76`
    1. Support for HTTP/2 Server Push `76`
    1. Better Error Retrieval `76`
    1. Throw Error on Passing too fews functions arguments `77`
14. Performance Evaluation `78`
15. Conclusion `85`

Many PHP applications are still running on PHP 5.x, not taking full advantage of the awesome features that PHP 7 offers.
A lot of developers have not made the switch because of certain fears of compatibility issues, migration challenges, and the awkward feeling that migrating their apps will take away a big chunk of their time.
If you are looking for a way to understand PHP 7 features like a boss, and migrate that PHP 5 app without hitting your head against the wall, then this handbook is for you.

eBook PHP

migrating-to-php7

#### Releases
- Setup and development environment.
- A comprehensive rundown of PHP 7 features.
- Migrating an API and a Web Application to PHP 7.