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@ 2014-02-13T19:50:15Z

<?php
function move($past, $current) {
    if($current == 15) return 1;
    $x = $current >> 2;
    $y = $current % 4;

    $valid_moves = array();
    if($x < 3) {
        $possible = $current+4;
        if(!isset($past[$possible])) {
            $valid_moves[] = $possible;
        }
    }
    if($x > 0) {
        $possible = $current-4;
        if(!isset($past[$possible])) {
            $valid_moves[] = $possible;
        }
    }

    if($y < 3) {
        $possible = $current+1;
        if(!isset($past[$possible])) {
            $valid_moves[] = $possible;
        }
    }
    if($y > 0) {
        $possible = $current-1;
        if(!isset($past[$possible])) {
            $valid_moves[] = $possible;
        }
    }

    if(empty($valid_moves)) return 0;
    else {
        $score = 0;
        $past[$current] = true;
        foreach($valid_moves as $valid_move) {
            $score += move($past, $valid_move);
        }
        return $score;
    }
}
echo move(array(),0);

Output for git.master, git.master_jit, rfc.property-hooks: 184

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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