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Package php-curry
Short Description Curried functions in PHP
License MIT
Informations about the package php-curry
php-curry
An implementation for currying in PHP
Currying a function means the ability to pass a subset of arguments to a function, and receive back another function that accepts the rest of the arguments. As soon as the last one is passed it gets back the final result.
Like this:
Currying is a powerful (yet simple) concept, very popular in other, more purely functional languages. In haskell for example, currying is the default behavior for every function.
In PHP we still need to rely on a wrapper to simulate the behavior
How to install
In your PHP scripts (with composer autoloader in place) just import the namespace and use it!
Right to left
It's possible to curry a function from left (default) or from right.
Parameters as an array
You can also curry a function and pass the parameters as an array, just use the *_args version of the function.
Optional parameters
Optional parameters and currying do not play very nicely together. This library excludes optional parameters by default.
But strpos has an optional $offset parameter that by default has not been considered.
If you want to take this optional $offset parameter into account you should "fix" the curry to a given length.
curry_right has its own fixed version named curry_right_fixed
Placeholders
The function __()
gets a special placeholder value used to specify "gaps" within curried functions, allowing partial application of any combination of arguments, regardless of their positions.
Notes:
-
Placeholders should be used only for required arguments.
- When used, optional arguments must be at the end of the arguments list.