Migrating a PHP 5 app to PHP 7 Guide

Contents

1. Introduction 4
   1. PHP5 and PHP7 4
2. Upgrading your development environment to PHP7 6
   1. Mac OS X 6
   2. Windows 7
   3. Ubuntu 7
   4. Debian 8
   5. Cent OS / Red Hat Enterprise Linux 8
   6. phpbrew 9
   7. Vagrant 11
      1. Laravel Homestead 11
      2. phpdev 12
   8. Valet 12
   9. Docker 15
      1. php7-dockerized 15
      2. Laradock 15
      3. phpdocker 16
3. Elementary Language Changes 17
   1. SpaceShip operator 17
   2. Array Constants 19
   3. Null Coalescing Operator 19
   4. Integer Division 20
   5. Regular Expressions 20
   6. Filtered unserialize() 21
      1. Cryptographically Secure Pseudorandom Number Generator (CSRPNG) 22
      2. session_start config enhancements 22
      3. Unpack objects with list() 22
      4. dirname() enhacement 23
      5. Reflection API Enhancements 23
      6. Reserved Words 24
4. Scalar Typehinting & Return type declarations 26
   1. Typehinting 26
   2. Return Types 27
   3. 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
   2. Generator Delegation 33
7. Object-oriented Programming enhancement 35
   1. Anonymous Classes 35
   2. 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
   2. 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
    2. PHP 7 Compatibility Checker 46
    3. Phan 46
    4. phpto7aid 46
    5. 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
       2. Build the App 53
       3. Run the App 62
       4. Migrate to PHP 7 64
    2. API 64
       1. Use PHP 7 Features 66
13. Introducing PHP 7.1 Features 71
    1. Nullable Types 71
    2. Void Type 72
    3. Symmetric Array Destructuring 72
    4. Class constant visibility 73
    5. Multi-Catch Exception Handling 73
    6. Iterables 74
    7. Keys support in list() 74
    8. Negative string Offset Support 75
    9. Conversion of Callables to Closures 75
    10. Asynchronous Signal Handling 76
    11. Support for HTTP/2 Server Push 76
    12. Better Error Retrieval 76
    13. Throw Error on Passing too fews functions arguments 77
14. Performance Evaluation 78
15. Conclusion 85