當使用preg_replace時，我得到雙重字符...？

Question

當我使用下面的腳本，我得到雙重字符。爲什麼？

$clean_lastname = "Dür"; 
$clean_lastname = preg_replace("/[ùúûü]/", "u", $clean_lastname); 
echo $clean_lastname; 

輸出：Duur

我希望它是Dur。

我仍然在做一些錯誤的事情...'在preg函數中放置一個數組的值是什麼？

$clean_lastname = "Boerée"; 
$l = 0; 
$pattern = array('[ÀÁÂÃÄÅ]','[Ç]','[ÈÉÊË]','[ÌÍÎÏ]','[Ñ]','[ÒÓÔÕÖØ]','[Ý]','[ß]','[àáâãäå]','[ç]','[èéêë]','[ìíîï]','[ñ]','[òóôõöø]','[ùúûü]','[ýÿ]'); 
$replace = array(A,C,E,I,N,O,Y,S,a,c,e,i,n,o,u,y); 

foreach ($pattern as $wierdchar) 
{ 
    $clean_lastname = preg_replace('/$wierdchar/u', '$replace[$l]', $clean_lastname); 
    $l++; 
} 

//$clean_lastname = preg_replace('/[èéêë]/u', 'e', $clean_lastname); 

//$clean_lastname = strtr($clean_lastname, "ùúûü","uuuu"); 
echo $clean_lastname; 

Answer 1

<?php 
    $vowels = array("ù","ú","û","ü"); 
    $consonents = array("u","u","u","u"); 
    $clean_lastname = "Dür"; 
    echo str_replace($vowels, $consonents, $clean_lastname); 
?> 

Answer 2

$clean_lastname = str_replace(array('ù', 'ú', 'û', 'ü', 'Ù', 'Ú', 'Û', 'Ü'), array('u', 'u', 'u', 'u', 'U', 'U', 'U', 'U'), $clean_lastname); 

//或解決您最初的問題：

$clean_lastname = preg_replace('/[ùúûü]/u', 'u', $clean_lastname); 

Answer 3

堅持你原來的strtr

$clean_lastname = "Dür Dùr Dúr Dûr"; 
$clean_lastname = strtr($clean_lastname, "ùúûü", "uuuu"); 
echo $clean_lastname; 

Answer 4

唯一的情況，我可以像這樣的事情發生是當你的兩個字符串（輸入str ing和模式）具有不同的字符編碼或兩者都是UTF-8，但您沒有正確指定它。

因爲在後者的情況下，"Dür"相當於"D\xC3\xBCr"和圖案"/[ùúûü]/"（ü與兩個字節序列0xC3BC編碼）等效於"/[\xC3\xB9\xC3\xBA\xC3\xBB\xC3\xBC]/"。使用UTF-8工作時

echo preg_replace("/[\xC3\xB9\xC3\xBA\xC3\xBB\xC3\xBC]/", "u", "D\xC3\xBCr"); // Duur 

所以確保設置u modifier flag使得圖案與輸入字符串是：由於通過轉義序列\xHH指定的每個字節被作爲一個單一的字符處理，這產生以下結果爲UTF-8編碼的處理：

"/[ùúûü]/u" 

---

編輯現在你澄清你的意圖，你似乎試圖實現某種transliteration，你應該看看iconv和它的音譯能力：

iconv("UTF-8", "US-ASCII//TRANSLIT", $str) 

參見其他相關主題，如：

• How to transliterate accented characters into plain ASCII characters?
• How to handle user input of invalid UTF-8 characters?