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PHP Web Services

Cover of PHP Web Services by Lorna Jane Mitchell Published by O'Reilly Media, Inc.
  1. Preface
    1. Conventions Used in This Book
    2. Using Code Examples
    3. Safari® Books Online
    4. How to Contact Us
  2. 1. Introduction
  3. 2. HTTP
    1. Examining HTTP
      1. Curl
      2. Browser Tools
      3. PHP
  4. 3. Request and Response
    1. Clients and Servers
  5. 4. HTTP Verbs
    1. GET
    2. POST
    3. Other HTTP Verbs
  6. 5. Headers
    1. Request and Response Headers
    2. Common HTTP Headers
      1. User-Agent
      2. Headers for Content Negotiation
      3. Authorization
      4. Custom Headers
  7. 6. Cookies
    1. Cookie Mechanics
    2. Working With Cookies in PHP
  8. 7. JSON
    1. When to Choose JSON
    2. Handling JSON with PHP
    3. JSON in Existing APIs
  9. 8. XML
    1. When To Choose XML
    2. XML in PHP
    3. XML in Existing APIs
  10. 9. RPC and SOAP Services
    1. RPC
    2. SOAP
      1. WSDL
      2. PHP SOAP Client
      3. PHP SOAP Server
      4. Generating a WSDL File from PHP
      5. PHP Client and Server with WSDL
  11. 10. REST
    1. RESTful URLs
    2. Resource Structure and Hypermedia
    3. Data and Media Types
    4. HTTP Features in REST
      1. Create Resources
      2. Read Records
      3. Update Records
      4. Delete Records
    5. Additional Headers in RESTful Services
      1. Authorisation Headers
      2. Caching Headers
    6. RESTful vs Useful
  12. 11. Debugging Web Services
    1. Debug Output
    2. Logging
    3. Debugging From Outside Your Application
      1. Wireshark
      2. Charles Proxy
    4. Finding the Tool for the Job
  13. 12. Making Service Design Decisions
    1. Service Type Decisions
    2. Consider Data Formats
    3. Customisable Experiences
    4. Pick Your Defaults
  14. 13. Building a Robust Service
    1. Consistency is Key
      1. Consistent and Meaningful Naming
      2. Common Validation Rules
      3. Predictable Structures
    2. Making Design Decisions for Robustness
  15. 14. Error Handling in APIs
    1. Output Format
    2. Meaningful Error Messages
    3. What To Do When You See Errors
  16. 15. Documentation
    1. Overview Documentation
    2. API Documentation
    3. Interactive Documentation
    4. Tutorials and the Wider Ecosystem
  17. A. A Guide To Common Status Codes
  18. B. Common HTTP Headers
  19. About the Author
  20. Copyright
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Chapter 7. JSON

JSON stands for JavaScript Object Notation, but don’t be fooled by the name. Although it sounds as if it’s a JavaScript-specific format, it is easily read and writeable by a wide range of scripting languages today. It’s a very simple, lightweight format which can represent nested, structured data.

For example, if we had data that looked like this:

  • message

    • en: “hello friend”
    • es: “hola amigo”

In JSON, that data would look like this:

{"message":{"en":"hello friend","es":"hola amigo"}}

If a piece of data is a scalar value, then it is presented plainly. If it is structured like that shown above, in PHP something like an associative array or an object with properties, we use a curly brace to indicate a new level of depth in the data structure. The keys and values are separated by colons, and each record at a given level is separated with a comma.

It is also possible to show a list of items quite elegantly using JSON. Take this imaginary simple shopping list:

  • eggs
  • bread
  • milk
  • bananas
  • bacon
  • cheese

A JSON representation of this would simply be:


As you can see here, the keys we had in the previous example are optional, and where we have multiple values, these are enclosed with the simple square brackets. If this list was in fact the value of a property, then we’d see both kinds of brackets:


This example shows that our data contained a key/value pair, with the key “list”. ...

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