检测utf8字符串中的latin1字符

Question

我从utf8编码的数据库中获取数据。但不知怎的，一些旧数据包含latin1字符。

所以这

$encod = mb_detect_encoding($string, 'UTF-8', true); 

永远是正确的。

总是使用utf8_decode（）来检查latin1字符（如'äöß'）是否安全？

$string = utf8_decode($string); 
$search = Array(" ", "ä", "ö", "ü", "ß", "."); //,"/Ä/","/Ö/","/Ü/"); 
$replace = Array("-", "ae", "oe", "ue", "ss", "-"); //,"Ae","Oe","Ue"); 
$string = str_replace($search, $replace, strtolower($string)); 

问候

Answer 1

使用用htmlspecialchars（）;工作更安全。 更多信息：

http://php.net/manual/en/function.htmlspecialchars.php

Answer 2

似乎不上班utf8_encoding：

<?php 
    $string = "äöüß"; 
    $search = Array(" ", "ä", "ö", "ü", "ß", "."); //,"/Ä/","/Ö/","/Ü/"); 
    $replace = Array("-", "ae", "oe", "ue", "ss", "-"); //,"Ae","Oe","Ue"); 
    $string = str_replace($search, $replace, strtolower($string)); 
    echo $string; 
?> 

DEMO：http://codepad.org/HGTyHkBU