1+ <?php
2+ /*
3+ * 用字母表数字替换字符串的字母
4+ * In this kata you are required to, given a string, replace every letter with its position in the alphabet.
5+ * If anything in the text isn't a letter, ignore it and don't return it.
6+ * As an example:
7+ alphabet_position('The sunset sets at twelve o\' clock.');
8+ Should return "20 8 5 19 21 14 19 5 20 19 5 20 19 1 20 20 23 5 12 22 5 15 3 12 15 3 11" as a string.
9+ */
10+ function alphabet_position (string $ sstring
11+ {
12+ // 字母表数组
13+ $ letterArr1 => '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 ' ];
14+ // 将参数$s全部小写, 转换为目标数组
15+ $ targetArrstr_split (strtolower ($ s
16+ $ result'' ;
17+ // 循环目标数组
18+ foreach ($ targetArras $ value
19+ // 循环字母表数组
20+ foreach ($ letterArras $ k$ v
21+ // 比较两个数组中值,若相等, 取出字母表数组中键
22+ if ($ value$ v
23+ $ result$ k'' ;
24+ }
25+ }
26+ }
27+ // 去除右边空格.
28+ return rtrim ($ result
29+ }
30+ 31+ function alphabet_position_clever (string $ sstring
32+ {
33+ $ value'' ;
34+ // 根据正则表达式排除非字符的字符串, 转换为目标数组, 并循环
35+ foreach (str_split (preg_replace ('/[^a-z]/i ' , '' , $ sas $ letter
36+ // 求每个大写英文字符 ASCII 码值.
37+ // A在ASCII表是第65,依次排序25个字母,所以要减去64得到26个字母表正确数字
38+ // https://baike.baidu.com/pic/ASCII/309296/0/c2fdfc039245d688c56332adacc27d1ed21b2451?fr=lemma&ct=single#aid=0&pic=c2fdfc039245d688c56332adacc27d1ed21b2451
39+ $ letterToNumberord (strtoupper ($ letter64 ;
40+ // 拼接字符串
41+ $ value"{$ letterToNumber ;
42+ }
43+ return trim ($ value
44+ }
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