Question

我正在为学校制作一个php morse编码器和解码器。
我已经让编码器工作但我无法弄清楚如何使解码器工作。

下面的代码是我的解码器。我试图使解码器通过用代码切换字母与我的编码器相同。这不起作用，因为它会混淆莫尔斯字母并合并它们。
所以我想我必须首先得到放在解码器中的每个字母，把它们放在一个数组中并单独解码它们然后在最后将它们重新组合在一起。
我尝试了很多东西，但实际上我不知道我在做什么，我无法弄明白我是php的新手，所以我尽量保持简单。
任何帮助表示赞赏！

<?php
$break = "<br>" ;
$Words = $_POST['morse2'];

//get the morse, seperate each letter and then decode and echo the outcome

$seperation = explode(" ", $Words);
var_dump($seperation) ;
echo $break ;

// foreach($seperation){
// str_replace("/ "," ",$seperation);
// }
$seperation = str_replace("/ "," ",$Words);
$seperation = str_replace(".- ","a",$Words);
$seperation = str_replace("-... ","b",$Words);
$seperation = str_replace("-.-. ","c",$Words);
$seperation = str_replace("-.. ","d",$Words);
$seperation = str_replace(". ","e",$Words);
$seperation = str_replace("..-. ","f",$Words);
$seperation = str_replace("--. ","g",$Words);
$seperation = str_replace(".... ","h",$Words);
$seperation = str_replace(".. ","i",$Words);
$seperation = str_replace(".--- ","j",$Words);
$seperation = str_replace("-.- ","k",$Words);
$seperation = str_replace(".-.. ","l",$Words);
$seperation = str_replace("-- ","m",$Words);
$seperation = str_replace("-. ","n",$Words);
$seperation = str_replace("--- ","o",$Words);
$seperation = str_replace(".--. ","p",$Words);
$seperation = str_replace(".-. ","r",$Words);
$seperation = str_replace("... ","s",$Words);
$seperation = str_replace("- ","t",$Words);
$seperation = str_replace("..- ","u",$Words);
$seperation = str_replace("...- ","v",$Words);
$seperation = str_replace("-.-- ","y",$Words);
$seperation = str_replace("--.. ","z",$Words);
$seperation = str_replace("--.- ","q",$Words);
$seperation = str_replace(".-- ","w",$Words);
$seperation = str_replace("-..- ","x",$Words);

$seperation = str_replace(".---- ","1",$Words);
$seperation = str_replace("..--- ","2",$Words);
$seperation = str_replace("...-- ","3",$Words);
$seperation = str_replace("....- ","4",$Words);
$seperation = str_replace("..... ","5",$Words);
$seperation = str_replace("-.... ","6",$Words);
$seperation = str_replace("--... ","7",$Words);
$seperation = str_replace("---.. ","8",$Words);
$seperation = str_replace("----. ","9",$Words);
$seperation = str_replace("----- ","0",$Words);

echo $seperation;

  /*Here's a tiny piece of my encoder to show you how i did that
    basically the same as the decoder, real simple.
  $Words = $_POST['morse'];
  $Words = str_replace(" ","/ ",$Words);
  $Words = str_replace("a",".- ",$Words);
  $Words = str_replace("b","-... ",$Words);
  $Words = str_replace("c","-.-. ",$Words);
  echo $Words;
  /*
?>

Answer 1

这是一个有趣的问题。我把它分成两个函数，一个编码器和一个解码器。它们都有相同的数组，我们从get_morse()函数得到它（我只是把它分成一个单独的函数，所以它产生更少的行）。 get_morse()在每个莫尔斯码之后都有一个空格，因此在编码时它不会混乱。我们可以在解码时用trim()轻松修剪它（因为我们用空格分隔字符串以获得每个代码所代表的字母）。

function get_morse() {
    return array(" " => "/ ", "a" => "*- ", "b" => "-*** ", "c" => "-*-* ", "d" => "-** ", "e" => "* ", "f" => "**-* ", "g" => "--* ", "h" => "**** ", "i" => "** ", "j" => "*--- ", "k" => "-*- ", "l" => "*-** ", "m" => "-- ", "n" => "-* ", "o" => "--- ", "p" => "*--* ", "q" => "--*- ", "r" => "*-* ", "s" => "*** ", "t" => "- ", "u" => "**- ", "v" => "***- ", "w" => "*-- ", "x" => "-**- ", "y" => "-*-- ", "z" => "--** ");
}

然后编码器很简单，

function morse_encoder($word) {
    return str_replace(array_keys(get_morse()), get_morse(), strtolower($word));
}

它基本上用每个相应的莫尔斯码（它是数组中的值）替换每个字母（这是莫尔斯阵列中的一个键）。所以你在数组中得到'a' => "*- "，并用数组中的值替换所有字母（键）。

使用某些array_*函数可能会进一步简化解码器，但这可以正常工作和解码。我们将使用与之前相同的数组，来自get_morse()。

function morse_decoder($word) {
    $morse = array_map("trim", get_morse());
    $output = "";
    foreach (explode(" ", $word) as $value) {
        $output .= array_search($value, $morse);
    }
    return strtoupper($output);
}

我们用空格分割编码的字符串，这给了我们一个数组，每个单独的莫尔斯代码作为它自己的元素。然后，我们可以循环使用此功能，然后“反向”。编码时我们做的程序;找到匹配莫尔斯码的数组中的每个元素，并用其键替换它;这是适当的信。

这些功能的使用将是

echo morse_encoder("sos");          // Output: *** --- ***
echo morse_decoder("*** --- ***");  // Output: SOS

Live demo

坚持php莫尔斯解码器

1 个答案: