A compose function for PHP

functional_compose.php

<?
class FunctionalFuncs {
  public static function compose() {
		$function_reducer = function ( $result, $func ) {
			return [ call_user_func_array( $func, $result ) ];
		};
		$callbacks = func_get_args();
		return function() use ( $callbacks, $function_reducer ) {
			$arguments = func_get_args();
			return array_reduce( $callbacks, $function_reducer, $arguments )[0];
		};
	}
}

This is not a real "composition" per se.

According to Mathematics (and many languages are following those naming conventions), composition needs to be processed from the right to the left.

f · g · h => f(g(h(...)))

This example, despite the fact it's technically valid, should better be renamed into: Pipe.

Pipe is usually a kind of "composition" applied from left to right and is sometimes better suited.

On my side, I definitely prefer using Pipe because processing stuff from left to right is definitely more readable.
However, if you want to use Composition, you'll have to reverse the array of provided functions and process it like a Pipe.

Examples:

• https://ramdajs.com/docs/#compose
• https://ramdajs.com/docs/#pipe