array_filter wrapper

filter.php

<?php


$users = array( 'John', "Bobby", 'Alex' );
function filter( $fn ) {
	return function( $arr ) use ( $fn ) {
		return array_filter( $arr, $fn );
	};
}
function get( $value ) {
	return function( $el ) use ( $value ) {
		return $el === $value;
	};
}
function get_user( $username, $users ) {
	$find = filter( get( $username ) );
	return either( return_error( 'Users not found' ), $find( $users ) );
}
var_dump( get_user( 'Bobby', $users ) );