PHP similar_text()、levenshtein()、lcs()支持中文汉字版，

PHP similar_text()、levenshtein()、lcs()支持中文汉字版，

PHP 原生的similar_text()函数、levenshtein()函数对中文汉字支持不好，我自己写了一个

similar_text()中文汉字版

 1     php  
 2     //拆分字符串  
 3     function split_str($str) {  
 4       preg_match_all("/./u", $str, $arr);  
 5       return $arr[0];  
 6     }  
 7       
 8     //相似度检测  
 9     function similar_text_cn($str1, $str2) {  
10       $arr_1 = array_unique(split_str($str1));  
11       $arr_2 = array_unique(split_str($str2));  
12       $similarity = count($arr_2) - count(array_diff($arr_2, $arr_1));  
13         
14       return $similarity;  
15     }  

levenshtein()中文汉字版

 1     php  
 2     //拆分字符串  
 3     function mbStringToArray($string, $encoding = 'UTF-8') {  
 4         $arrayResult = array();  
 5       
 6         while ($iLen = mb_strlen($string, $encoding)) {  
 7             array_push($arrayResult, mb_substr($string, 0, 1, $encoding));  
 8             $string = mb_substr($string, 1, $iLen, $encoding);  
 9         }  
10       
11         return $arrayResult;  
12     }  
13       
14     //编辑距离  
15     function levenshtein_cn($str1, $str2, $costReplace = 1, $encoding = 'UTF-8') {  
16         $count_same_letter = 0;  
17         $d = array();  
18       
19         $mb_len1 = mb_strlen($str1, $encoding);  
20         $mb_len2 = mb_strlen($str2, $encoding);  
21       
22         $mb_str1 = mbStringToArray($str1, $encoding);  
23         $mb_str2 = mbStringToArray($str2, $encoding);  
24       
25         for ($i1 = 0; $i1 $mb_len1