Online PHP editor | rfc for VOtvl

@ 2014-01-19T18:21:39Z

<?php

function checkCase($string)
{
    // --- 列出标点的转换规则
    $symMap = [
        "." => ">",
        "," => "<"
    ];

    foreach($symMap as $k => $v)
        $symMap[$v] = $k;
    // 列出标点的转换规则 ---

    // --- 列出各种可能情况
    // $element = [["a", "A"], [".", ">"], ["b", "B"]]
    $element = str_split($string);

    foreach($element as &$item)
    {
        if(in_array($item, $symMap))
            $item = [$item, $symMap[$item]];
        else
            $item = [strtolower($item), strtoupper($item)];
    }
    // 列出各种可能情况 ---

    // 记录当前的组合状态，每一项对应 $element 中的每一项
    $flags = array_fill(0, count($element), 0);
    // 记录结果
    $result = [];

    while(true)
    {
        $solution = "";

        // 组合当前一条结果
        foreach(range(0, count($element) - 1) as $i)
            $solution .= $element[$i][$flags[$i]];

        // 改变当前状态，同时返回是否已经到达了末尾
        $isEnding = function() use(&$flags, $element) {
            foreach(range(0, count($flags) - 1) as $i)
            {
                if($flags[$i] < count($element[$i]) - 1)
                {
                    $flags[$i]++;

                    if($i > 0)
                        foreach(range(0, $i - 1) as $j)
                            $flags[$j] = 0;

                    return false;
                }
            }
            return true;
        };

        if(!$isEnding())
            $result[] = $solution;
        else
            break;
    }

    return $result;
}

var_dump(checkCase("A.B"));
var_dump(checkCase("ABCD"));

Output for git.master, git.master_jit, rfc.property-hooks: array(7) { [0]=> string(3) "a.b" [1]=> string(3) "A.b" [2]=> string(3) "a>b" [3]=> string(3) "A>b" [4]=> string(3) "a.B" [5]=> string(3) "A.B" [6]=> string(3) "a>B" } array(15) { [0]=> string(4) "abcd" [1]=> string(4) "Abcd" [2]=> string(4) "aBcd" [3]=> string(4) "ABcd" [4]=> string(4) "abCd" [5]=> string(4) "AbCd" [6]=> string(4) "aBCd" [7]=> string(4) "ABCd" [8]=> string(4) "abcD" [9]=> string(4) "AbcD" [10]=> string(4) "aBcD" [11]=> string(4) "ABcD" [12]=> string(4) "abCD" [13]=> string(4) "AbCD" [14]=> string(4) "aBCD" }

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2020-03-21 RFC: Is_Literal - declined
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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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
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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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