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Package jsonpath
Short Description JSONPath implementation for parsing, searching and flattening arrays
License MIT
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Informations about the package jsonpath
JSONPath for PHP 8.1+
This is a JSONPath implementation for PHP based on Stefan Goessner's JSONPath script.
JSONPath is an XPath-like expression language for filtering, flattening and extracting data.
This project aims to be a clean and simple implementation with the following goals:
- Object-oriented code (should be easier to manage or extend in future)
- Expressions are parsed into tokens using code inspired by the Doctrine Lexer. The tokens are cached internally to avoid re-parsing the expressions.
- There is no
eval()in use - Any combination of objects/arrays/ArrayAccess-objects can be used as the data input which is great if you're de-serializing JSON in to objects or if you want to process your own data structures.
Installation
JSONPath Examples
| JSONPath | Result |
|---|---|
$.store.books[*].author |
the authors of all books in the store |
$..author |
all authors |
$.store..price |
the price of everything in the store. |
$..books[2] |
the third book |
$..books[(@.length-1)] |
the last book in order. |
$..books[-1:] |
the last book in order. |
$..books[0,1] |
the first two books |
$..books[:2] |
the first two books |
$..books[::2] |
every second book starting from first one |
$..books[1:6:3] |
every third book starting from 1 till 6 |
$..books[?(@.isbn)] |
filter all books with isbn number |
$..books[?(@.price<10)] |
filter all books cheaper than 10 |
$..books.length |
the amount of books |
$..* |
all elements in the data (recursively extracted) |
Expression syntax
| Symbol | Description |
|---|---|
$ |
The root object/element (not strictly necessary) |
@ |
The current object/element |
. or [] |
Child operator |
.. |
Recursive descent |
* |
Wildcard. All child elements regardless their index. |
[,] |
Array indices as a set |
[start:end:step] |
Array slice operator borrowed from ES4/Python. |
?() |
Filters a result set by a script expression |
() |
Uses the result of a script expression as the index |
PHP Usage
Using arrays
Using objects
More examples can be found in the Wiki
Magic method access
The options flag JSONPath::ALLOW_MAGIC will instruct JSONPath when retrieving a value to first check if an object
has a magic __get() method and will call this method if available. This feature is iffy and
not very predictable as:
- wildcard and recursive features will only look at public properties and can't smell which properties are magically accessible
- there is no
property_existscheck for magic methods so an object with a magic__get()will always returntruewhen checking if the property exists - any errors thrown or unpredictable behaviour caused by fetching via
__get()is your own problem to deal with
For more examples, check the JSONPathTest.php tests file.
Script expressions
Script expressions are not supported as the original author intended because:
- This would only be achievable through
eval(boo). - Using the script engine from different languages defeats the purpose of having a single expression evaluate the same way in different languages which seems like a bit of a flaw if you're creating an abstract expression syntax.
So here are the types of query expressions that are supported:
[?(@._KEY_ _OPERATOR_ _VALUE_)] // <, >, <=, >=, !=, ==, =~, in and nin
e.g.
[?(@.title == "A string")] //
[?(@.title = "A string")]
// A single equals is not an assignment but the SQL-style of '=='
[?(@.title =~ /^a(nother)? string$/i)]
[?(@.title in ["A string", "Another string"])]
[?(@.title nin ["A string", "Another string"])]Known issues
- This project has not implemented multiple string indexes e.g.
$[name,year]or$["name","year"]. I have no ETA on that feature, and it would require some re-writing of the parser that uses a very basic regex implementation.
Similar projects
FlowCommunications/JSONPath is the predecessor of this library by Stephen Frank
Other / Similar implementations can be found in the Wiki.
Changelog
A list of changes can be found in the CHANGELOG.md file.
License 🌳
1-2.dev
This package is Treeware. If you use it in production, then we ask that you buy the world a tree to thank us for our work. By contributing to the ecologi project, you’ll be creating employment for local families and restoring wildlife habitats.
Contributors ✨
Sascha Greuel |
Fabian Blechschmidt |
Loïc Leuilliot |
Sergey |
Alexandru Pătrănescu |
Oleg Andreyev |
Remy Suen |
esomething |
All versions of jsonpath with dependencies
ext-json Version *