依次在原始字符串的每个字母后生成带撇号的字符串

时间:2009-07-30 11:31:58

标签: php string

如何迭代地创建一个“Murrays”变体,每个字母后面都有一个撇号?最终结果应该是:

"m'rrays,mu'rrays,mur'rays,murr'ays,murra'ys,murray's"

5 个答案:

答案 0 :(得分:1)

你想要遍历这个名字,并用撇号重新打印它?请尝试以下方法:

<?php

    $string = "murrays";

    $array  = str_split($string);
    $length = count($array);
    $output = "";

    for ($i = 0; $i < $length; $i++) {
      for($j = 0; $j < $length; $j++) {
        $output .= $array[$j];
        if ($j == $i) 
            $output.= "'";
      }
      if ($i < ($length - 1))
        $output .= ",";
    }

    print $output;

?>

答案 1 :(得分:1)

我的建议:

<?php                      
function generate($str, $add, $separator = ',')
{
    $split = str_split($str);
    $total = count($split) - 1;

    $new = '';
    for ($i = 0; $i < $total; $i++)
    {
        $aux = $split;
        $aux[$i+1] = "'" . $aux[$i+1];
        $new .= implode('', $aux).$separator;
    }
    return $new;
}
echo generate('murrays', "'");
?>

答案 2 :(得分:0)

这是另一种解决方案:

$str = 'murrays';
$variants = array();
$head = '';
$tail = $str;
for ($i=1, $n=strlen($str); $i<$n; $i++) {
    $head .= $tail[0];
    $tail = substr($tail, 1);
    $variants[] = $head . "'" . $tail;
}
var_dump(implode(',', $variants));

答案 3 :(得分:0)

这就是函数编程在这里的原因

此代码适用于OCAML和F#,您可以轻松地在C#上运行

let generate str =
     let rec gen_aux s index =
         match index with
             | String.length s -> [s]
             | _ -> let part1 = String.substr s 0 index in
                    let part2 = String.substr s index (String.length s) in
                    (part1 ^ "'" ^ part2)::gen_aux s (index + 1)
     in gen_aux str 1;;

generate "murrays";;

此代码返回原始单词作为列表的结尾,您可以解决该问题:)

答案 4 :(得分:0)

你走了:

$array = array_fill(0, strlen($string) - 1, $string);
implode(',', array_map(create_function('$string, $pos', 'return substr_replace($string, "\'", $pos + 1, 0);'), $array, array_keys($array)));