Question

我为多个字符串替换编写了一个php函数

$searchArray = array("0","9","8","7","6","5","4","3","2","1","!","@","#","$","%","^","&","*","(",")","z","x","y","w","u","v","j","i","h","g","f","e","d","c","b","a");
$replaceArray = array("1","2","3","4","5","6","7","8","9","0","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");       
$string='protect your php code';
echo $code=str_replace($searchArray, $replaceArray, $string);

其结果= protvxt moor psp xowv看似正确

当我改变其立场时

$string='protvxt moor psp xowv';       
$searchArray = array("1","2","3","4","5","6","7","8","9","0","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");   

$replaceArray = array("0","9","8","7","6","5","4","3","2","1","!","@","#","$","%","^","&","*","(",")","z","x","y","w","u","v","j","i","h","g","f","e","d","c","b","a");
echo $code=str_replace($searchArray, $replaceArray, $string);

它给我这个答案= eifgecg bffi ehe cfde（这是错的）它应该正确颠倒并给出答案保护你的PHP代码

老实说，我不知道为什么php做错了

我在这里粘贴代码

http://codepad.org/xbSCieZl

请检查这个我想知道我做错了什么让我发疯

Answer 1

您的数组应包含相同的字符。

第一次转换不会将字符'pro'从'protect'更改

但逆转确实如此。

编辑：对不起这个答案是错误的，因为我不知道以下的问题，詹姆斯在上面提到：“这一般不会奏效。你的测试字符串很幸运。如果你试图编码字符串“123”你将获得“123”，因为1变为零，然后零变为1，等等。请参阅str_replace gotchas - James“

您可以使用上面的建议strtr（）

$search = "abcdefghijklmnopqrstuvwxyz";
$replace = "zabcdefghijklmnopqrstuvwxy"; 

$string='protect your php code';

echo $code=strtr($string, $search, $replace);   
echo '<br>';    
echo strtr($code, $replace, $search);

输出：
oqnsdbs xntq ogo bncd
保护您的PHP代码

编辑：
另外，你可以生成你的字符串并随机化：

$search = implode("",range("a","z")).implode("",range("0","9"));
$replace = str_shuffle($search);

http://codepad.org/DZJRp9Zx

php在str_replace函数中做错了替换

1 个答案: