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@ 2016-11-07T22:44:15Z

<?php

class Odometer {
    public function __construct(array $values, $max_places = 0){
        $this->values = array_values($values);
        $this->max_places = $max_places;

        reset($values);
        $this->register[0] = key($values);

        end($values);
        $this->limit = key($values);
    }
    
    public function iterate($force = false){
        $rollback = $this->register;
        $this->register[0]++;
        for($i = 0; $i < count($this->register); $i++){
            if($this->register[$i] > $this->limit){
                $this->register[$i] = 0;
                if(isset($this->register[$i+1])){
                    $this->register[$i+1]++;
                } else {
                    if($this->max_places && count($this->register)+1 > $this->max_places && !$force){ 
                        $this->register = $rollback;
                        return; 
                    }
                    $this->register[$i+1] = 0;
                }
            }
        }
    }
    
    public function setMeter(){
        for($i = 0; $i < count($this->register); $i++){
            $this->meter[$i] = $this->values[$this->register[$i]];
        }
    }
    
    public function readMeter(){
        $this->setMeter();
        return '[' . implode('][', array_reverse($this->meter)) . ']' . "\n";
    }
}

$o = new Odometer(range('a','c'), 2);

echo $o->readMeter();
for($i = 0; $i < 20; $i++){
    $o->iterate(false);
    echo $o->readMeter();
}

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Creation of dynamic property Odometer::$values is deprecated in /in/gT7Nq on line 5 Deprecated: Creation of dynamic property Odometer::$max_places is deprecated in /in/gT7Nq on line 6 Deprecated: Creation of dynamic property Odometer::$register is deprecated in /in/gT7Nq on line 9 Deprecated: Creation of dynamic property Odometer::$limit is deprecated in /in/gT7Nq on line 12 Deprecated: Creation of dynamic property Odometer::$meter is deprecated in /in/gT7Nq on line 36 [a] [b] [c] [a][a] [a][b] [a][c] [b][a] [b][b] [b][c] [c][a] [c][b] [c][c] [c][c] [c][c] [c][c] [c][c] [c][c] [c][c] [c][c] [c][c] [c][c]

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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