Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > PHP similar_text(), levenshtein(), lcs() support Chinese character version, _PHP tutorial

PHP similar_text(), levenshtein(), lcs() support Chinese character version, _PHP tutorial

WBOY
Release： 2016-07-13 10:16:02
Original
1852 people have browsed it

PHP similar_text(), levenshtein(), lcs() support the Chinese character version,

PHP’s native similar_text() function, levenshtein() function does not support Chinese characters well , I wrote one myself


similar_text() Chinese character version

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

levenshtein() Chinese character version

<span> 1</span>     <?<span>php  
</span><span> 2</span>     <span>//</span><span>拆分字符串  </span>
<span> 3</span>     <span>function</span> mbStringToArray(<span>$string</span>, <span>$encoding</span> = 'UTF-8'<span>) {  
</span><span> 4</span>         <span>$arrayResult</span> = <span>array</span><span>();  
</span><span> 5</span>       
<span> 6</span>         <span>while</span> (<span>$iLen</span> = mb_strlen(<span>$string</span>, <span>$encoding</span><span>)) {  
</span><span> 7</span>             <span>array_push</span>(<span>$arrayResult</span>, mb_substr(<span>$string</span>, 0, 1, <span>$encoding</span><span>));  
</span><span> 8</span>             <span>$string</span> = mb_substr(<span>$string</span>, 1, <span>$iLen</span>, <span>$encoding</span><span>);  
</span><span> 9</span> <span>        }  
</span><span>10</span>       
<span>11</span>         <span>return</span> <span>$arrayResult</span><span>;  
</span><span>12</span> <span>    }  
</span><span>13</span>       
<span>14</span>     <span>//</span><span>编辑距离  </span>
<span>15</span>     <span>function</span> levenshtein_cn(<span>$str1</span>, <span>$str2</span>, <span>$costReplace</span> = 1, <span>$encoding</span> = 'UTF-8'<span>) {  
</span><span>16</span>         <span>$count_same_letter</span> = 0<span>;  
</span><span>17</span>         <span>$d</span> = <span>array</span><span>();  
</span><span>18</span>       
<span>19</span>         <span>$mb_len1</span> = mb_strlen(<span>$str1</span>, <span>$encoding</span><span>);  
</span><span>20</span>         <span>$mb_len2</span> = mb_strlen(<span>$str2</span>, <span>$encoding</span><span>);  
</span><span>21</span>       
<span>22</span>         <span>$mb_str1</span> = mbStringToArray(<span>$str1</span>, <span>$encoding</span><span>);  
</span><span>23</span>         <span>$mb_str2</span> = mbStringToArray(<span>$str2</span>, <span>$encoding</span><span>);  
</span><span>24</span>       
<span>25</span>         <span>for</span> (<span>$i1</span> = 0; <span>$i1</span> <= <span>$mb_len1</span>; <span>$i1</span>++<span>) {  
</span><span>26</span>             <span>$d</span>[<span>$i1</span>] = <span>array</span><span>();  
</span><span>27</span>             <span>$d</span>[<span>$i1</span>][0] = <span>$i1</span><span>;  
</span><span>28</span> <span>        }  
</span><span>29</span>       
<span>30</span>         <span>for</span> (<span>$i2</span> = 0; <span>$i2</span> <= <span>$mb_len2</span>; <span>$i2</span>++<span>) {  
</span><span>31</span>             <span>$d</span>[0][<span>$i2</span>] = <span>$i2</span><span>;  
</span><span>32</span> <span>        }  
</span><span>33</span>       
<span>34</span>         <span>for</span> (<span>$i1</span> = 1; <span>$i1</span> <= <span>$mb_len1</span>; <span>$i1</span>++<span>) {  
</span><span>35</span>             <span>for</span> (<span>$i2</span> = 1; <span>$i2</span> <= <span>$mb_len2</span>; <span>$i2</span>++<span>) {  
</span><span>36</span>                 <span>//</span><span> $cost = ($str1[$i1 - 1] == $str2[$i2 - 1]) ? 0 : 1;  </span>
<span>37</span>                 <span>if</span> (<span>$mb_str1</span>[<span>$i1</span> - 1] === <span>$mb_str2</span>[<span>$i2</span> - 1<span>]) {  
</span><span>38</span>                     <span>$cost</span> = 0<span>;  
</span><span>39</span>                     <span>$count_same_letter</span>++<span>;  
</span><span>40</span>                 } <span>else</span><span> {  
</span><span>41</span>                     <span>$cost</span> = <span>$costReplace</span>; <span>//</span><span>替换  </span>
<span>42</span> <span>                }  
</span><span>43</span>       
<span>44</span>                 <span>$d</span>[<span>$i1</span>][<span>$i2</span>] = <span>min</span>(<span>$d</span>[<span>$i1</span> - 1][<span>$i2</span>] + 1, <span>//</span><span>插入  </span>
<span>45</span>                 <span>$d</span>[<span>$i1</span>][<span>$i2</span> - 1] + 1, <span>//</span><span>删除  </span>
<span>46</span>                 <span>$d</span>[<span>$i1</span> - 1][<span>$i2</span> - 1] + <span>$cost</span><span>);  
</span><span>47</span> <span>            }  
</span><span>48</span> <span>        }  
</span><span>49</span>       
<span>50</span>         <span>return</span> <span>$d</span>[<span>$mb_len1</span>][<span>$mb_len2</span><span>];  
</span><span>51</span>         <span>//</span><span>return array('distance' => $d[$mb_len1][$mb_len2], 'count_same_letter' => $count_same_letter);  </span>
<span>52</span>     }
Copy after login
​

Longest common subsequence LCS()

<span> 1</span>         <?<span>php  
</span><span> 2</span>         <span>//</span><span>最长公共子序列英文版  </span>
<span> 3</span>         <span>function</span> LCS_en(<span>$str_1</span>, <span>$str_2</span><span>) {  
</span><span> 4</span>           <span>$len_1</span> = <span>strlen</span>(<span>$str_1</span><span>);  
</span><span> 5</span>           <span>$len_2</span> = <span>strlen</span>(<span>$str_2</span><span>);  
</span><span> 6</span>           <span>$len</span> = <span>$len_1</span> > <span>$len_2</span> ? <span>$len_1</span> : <span>$len_2</span><span>;  
</span><span> 7</span>           
<span> 8</span>           <span>$dp</span> = <span>array</span><span>();  
</span><span> 9</span>           <span>for</span> (<span>$i</span> = 0; <span>$i</span> <= <span>$len</span>; <span>$i</span>++<span>) {  
</span><span>10</span>             <span>$dp</span>[<span>$i</span>] = <span>array</span><span>();  
</span><span>11</span>             <span>$dp</span>[<span>$i</span>][0] = 0<span>;  
</span><span>12</span>             <span>$dp</span>[0][<span>$i</span>] = 0<span>;  
</span><span>13</span> <span>          }  
</span><span>14</span>           
<span>15</span>           <span>for</span> (<span>$i</span> = 1; <span>$i</span> <= <span>$len_1</span>; <span>$i</span>++<span>) {  
</span><span>16</span>             <span>for</span> (<span>$j</span> = 1; <span>$j</span> <= <span>$len_2</span>; <span>$j</span>++<span>) {  
</span><span>17</span>               <span>if</span> (<span>$str_1</span>[<span>$i</span> - 1] == <span>$str_2</span>[<span>$j</span> - 1<span>]) {  
</span><span>18</span>                 <span>$dp</span>[<span>$i</span>][<span>$j</span>] = <span>$dp</span>[<span>$i</span> - 1][<span>$j</span> - 1] + 1<span>;  
</span><span>19</span>               } <span>else</span><span> {  
</span><span>20</span>                 <span>$dp</span>[<span>$i</span>][<span>$j</span>] = <span>$dp</span>[<span>$i</span> - 1][<span>$j</span>] > <span>$dp</span>[<span>$i</span>][<span>$j</span> - 1] ? <span>$dp</span>[<span>$i</span> - 1][<span>$j</span>] : <span>$dp</span>[<span>$i</span>][<span>$j</span> - 1<span>];  
</span><span>21</span> <span>              }  
</span><span>22</span> <span>            }  
</span><span>23</span> <span>          }  
</span><span>24</span>           
<span>25</span>           <span>return</span> <span>$dp</span>[<span>$len_1</span>][<span>$len_2</span><span>];  
</span><span>26</span> <span>        }  
</span><span>27</span>           
<span>28</span>         <span>//</span><span>拆分字符串  </span>
<span>29</span>         <span>function</span> mbStringToArray(<span>$string</span>, <span>$encoding</span> = 'UTF-8'<span>) {  
</span><span>30</span>           <span>$arrayResult</span> = <span>array</span><span>();  
</span><span>31</span>           
<span>32</span>           <span>while</span> (<span>$iLen</span> = mb_strlen(<span>$string</span>, <span>$encoding</span><span>)) {  
</span><span>33</span>             <span>array_push</span>(<span>$arrayResult</span>, mb_substr(<span>$string</span>, 0, 1, <span>$encoding</span><span>));  
</span><span>34</span>             <span>$string</span> = mb_substr(<span>$string</span>, 1, <span>$iLen</span>, <span>$encoding</span><span>);  
</span><span>35</span> <span>          }  
</span><span>36</span>           
<span>37</span>           <span>return</span> <span>$arrayResult</span><span>;  
</span><span>38</span> <span>        }  
</span><span>39</span>           
<span>40</span>         <span>//</span><span>最长公共子序列中文版  </span>
<span>41</span>         <span>function</span> LCS_cn(<span>$str1</span>, <span>$str2</span>, <span>$encoding</span> = 'UTF-8'<span>) {  
</span><span>42</span>           <span>$mb_len1</span> = mb_strlen(<span>$str1</span>, <span>$encoding</span><span>);  
</span><span>43</span>           <span>$mb_len2</span> = mb_strlen(<span>$str2</span>, <span>$encoding</span><span>);  
</span><span>44</span>           
<span>45</span>           <span>$mb_str1</span> = mbStringToArray(<span>$str1</span>, <span>$encoding</span><span>);  
</span><span>46</span>           <span>$mb_str2</span> = mbStringToArray(<span>$str2</span>, <span>$encoding</span><span>);  
</span><span>47</span>           
<span>48</span>           <span>$len</span> = <span>$mb_len1</span> > <span>$mb_len2</span> ? <span>$mb_len1</span> : <span>$mb_len2</span><span>;  
</span><span>49</span>           
<span>50</span>           <span>$dp</span> = <span>array</span><span>();  
</span><span>51</span>           <span>for</span> (<span>$i</span> = 0; <span>$i</span> <= <span>$len</span>; <span>$i</span>++<span>) {  
</span><span>52</span>             <span>$dp</span>[<span>$i</span>] = <span>array</span><span>();  
</span><span>53</span>             <span>$dp</span>[<span>$i</span>][0] = 0<span>;  
</span><span>54</span>             <span>$dp</span>[0][<span>$i</span>] = 0<span>;  
</span><span>55</span> <span>          }  
</span><span>56</span>           
<span>57</span>           <span>for</span> (<span>$i</span> = 1; <span>$i</span> <= <span>$mb_len1</span>; <span>$i</span>++<span>) {  
</span><span>58</span>             <span>for</span> (<span>$j</span> = 1; <span>$j</span> <= <span>$mb_len2</span>; <span>$j</span>++<span>) {  
</span><span>59</span>               <span>if</span> (<span>$mb_str1</span>[<span>$i</span> - 1] == <span>$mb_str2</span>[<span>$j</span> - 1<span>]) {  
</span><span>60</span>                 <span>$dp</span>[<span>$i</span>][<span>$j</span>] = <span>$dp</span>[<span>$i</span> - 1][<span>$j</span> - 1] + 1<span>;  
</span><span>61</span>               } <span>else</span><span> {  
</span><span>62</span>                 <span>$dp</span>[<span>$i</span>][<span>$j</span>] = <span>$dp</span>[<span>$i</span> - 1][<span>$j</span>] > <span>$dp</span>[<span>$i</span>][<span>$j</span> - 1] ? <span>$dp</span>[<span>$i</span> - 1][<span>$j</span>] : <span>$dp</span>[<span>$i</span>][<span>$j</span> - 1<span>];  
</span><span>63</span> <span>              }  
</span><span>64</span> <span>            }  
</span><span>65</span> <span>          }  
</span><span>66</span>           
<span>67</span>           <span>return</span> <span>$dp</span>[<span>$mb_len1</span>][<span>$mb_len2</span><span>];  
</span><span>68</span>         }
Copy after login

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/900268.htmlTechArticlePHP similar_text(), levenshtein(), lcs() support Chinese character version, PHP native similar_text() function , the levenshtein() function does not support Chinese characters well, I wrote a simila myself...
Related labels：
php text Chinese support Chinese character Version
source：php.cn
Previous article：Usage examples of soap in PHP, PHPsoap usage examples_PHP tutorial Next article：The array_column() function I wrote myself that is compatible with versions lower than PHP 5.5, 5.5array_column_PHP tutorial
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
PHP arrays obtained from URL parameters do not behave as expected I have a URL parameter that contains the category ID and I want to treat it as an array li...
From 2024-04-06 22:09:02
0
1
1428
Where should I place CustomLog directive in apache I'm using php:7.2-apachedocker. I need to disable health check url login access log. Based...
From 2024-04-06 22:03:59
0
1
990
What is the format of the variables in the return value? I am a new learner of php. I found a piece of code: if($x<time()){return[false,'error']...
From 2024-04-06 21:55:20
0
1
778
Problems encountered when using opentbs to generate odt files: values ​​of the same key are displayed in the same row instead of separate columns. I'm using a library called OpenTbs to create odt using PHP, I'm using it because columns a...
From 2024-04-06 20:18:18
0
1
483
Group MySQL results by ID for looping over I have a table with flight data in mysql. I'm writing a php code that will group and displ...
From 2024-04-06 17:27:56
0
1
406
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template