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Example code of functional-php/pattern-matching

Informations about the package pattern-matching

Pattern Matching

pattern-matching CI StyleCI Code Coverage Average time to resolve an issue Percentage of issues still open Chat on Gitter

Pattern matching is the process of checking a series of token against a pattern. It is different from pattern recognition as the match needs to be exact. The process does not only match as a switch statement does, it also assigns the value a bit like the list construct in PHP, a process called destructuring.

Most functional languages implement it as a core feature. Here is are some small examples in Haskell:

If you want to read more about the topic, you can head over to Wikipedia : Pattern matching

Installation

composer require functional-php/pattern-matching

Basic Usage

As we cannot extend the syntax of PHP, the choice was made to use a syntax based on arrays. The key representes the pattern and the value is the function to call with the value or a constant if you want to do nothing with it.

Let's see how we could implement our 3 Haskell examples:

You can also use the match function if you want to have a beefed up version of the switch statement or if you don't like anonymous functions:

If you are just interested in destructuring your values, there is also a helper for that:

Patterns

Here is a quick recap of the available patterns:

Name Format Example
Constant Any scalar value (int, float, string, boolean) 1.0, 42, "test"
Variable identifier a, name, anything
Array [<pattern>, ..., <pattern>] [], [a], [a, b, c]
Cons (identifier:list-identifier) (x:xs), (x:y:z:xs)
Wildcard _ _
As identifier@(<pattern>) all@(x:xs)

Testing

You can run the test suite for the library using:

composer test

A test report will be available in the reports directory.

Contributing

Any contribution welcome :

All versions of pattern-matching with dependencies

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Requires php Version >=5.6.0
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