Question

如此 < a href=" https://webapps.stackschange.com/ questions/26301/facebook-acceptions-more-than-one-password" 所述,Facebook接受我们密码的截然相反的变换。例如:

1.- paSSw5ORD  (Original password)
2.- PAssW5ord  (Case altered to exact opposite, Capital->Small and vice-versa.)
3.- PaSSw5ORD  (Only first letter s case altered)

How to get the second variation, provided the first one is the original one, entered by user (or to get first one when user enters second version)? Here is my take on this.

<?php

$pass = "paSSw5ORD"; //Example password
$pass_len = strlen($pass); //Find the length of string

for($i=0;$i<$pass_len;$i++){
    if(!(is_numeric($pass[$i]))){                 //If Not Number
        if($pass[$i]===(strtoupper($pass[$i]))){  //If Uppercase
            $pass2 .= strtolower($pass[$i]);      //Make Lowercase & Append
        } else{                                   // If Lowercase
            $pass2 .= strtoupper($pass[$i]);      //Make Uppercase & Append
        }
    } else{                  //If Number
        $pass2 .= $pass[$i]; //Simply Append
    }
}

//Test both
echo $pass."
";
echo $pass2;
?>

但如何用特殊字符处理密码(在标准的英语键盘上尽可能使用?)

!@#$%^&*()_+|?><":}{~[]; ,./     (Space also)

这对以上所有特殊字符都行不通。

if(preg_match( /^[a-zA-Z]+$/ , "passWORD")){
//Special Character encountered. Just append it and
//move to next cycle of loop, similar to when we
//encountered a number in above code. 
}

我不是RegEx的专家,所以如何修改上述RegEx以确保它处理上述所有特殊人物?

Answer 1

在此设定一个函数, 以切换字符串中字符的大小写。

<?php
     $string = "Hello";                                      // the string which need to be toggled case
     $string_length = strlen($string);                      // calculate the string length
     for($i=0;$i<$string_length;$i++){                        // iterate to find ascii for each character
          $current_ascii = ord($string{$i});                 // convert to ascii code
          if($current_ascii>64 && $current_ascii<91){        // check for upper case character
                 $toggled_string .= chr($current_ascii+32);   // replace with lower case character
          }elseif($current_ascii>96 && $current_ascii<123){    // check for lower case character
                $toggled_string .= chr($current_ascii-32);   // replace with upper case character
          }else{
                $toggled_string .= $string{$i};               // concatenate the non alphabetic string.
              }
        }
     echo "The toggled case letter for $string is <hr />".$toggled_string; // output will be hELLO
?>

希望这能帮到你

此 < a href=" "http://mydons.com/how-to-toggle-criacter-case- in-php-unse-strlower-strupper-uc-first-inst-and-array- conference/" "rel=" "nofollow" >link 。

Answer 2

要反转字符串的大小写,我使用此函数:

function invert_case($string) {
  return preg_replace( /[a-z]/ie ,   $0  ^ str_pad(  , strlen( $0 ),    ) , $string);
}

我在很久以前的 http://www.php.net/ manual/en/formation.str-shuffle.php#55509>> php.net 手册中找到它,而我正想做同样的事情。我只是把它变成一个函数。

Answer 3

您需要探索 ctype_upper, ctype_lower 以在字符串中找到上写和小写字母,然后您就可以使用 strower和strtoupper 来更改字母的大小写。

Answer 4

这个问题之前的答案只对 a-z 有效。这对所有 Unicode 字符都有效。

ö -> Ö
Å -> å
ü -> Ü

以等等

function invert_case($str) {
    $inverted =   ;
    for($i=0;$i<mb_strlen($str);$i++) {
        $char = $str[$i];
        $upper = mb_strtoupper($char);
        if($upper == $char) {
            $inverted .= mb_strtolower($char);
        } else {
            $inverted .= $upper;
        }
    }
    return $inverted;
}

Answer 5

Joakim s answer is on the right track but one line is wrong: Replace $char = $str[$i]; with $char = mb_substr($str, $i, 1); Only then will it work for all unicode characters including German.

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