PHP字符串word末字符实现大小写互换的方法

本文实例讲述了PHP字符串word末字符实现大小写互换的方法。分享给大家供大家参考。具体实现方法如下：

一、要求：
给出一个字符串如 “A journey of, a thousand 'miles' must can't \"begin\" with a single step.” ，通过 PHP 程序处理变成 “a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP.”

这里需要注意：

1、每个单词最后的字符如果是大写就变成小写，如果是小写就变成大写。
2、需要考虑类似 can't 这种形式的转换。
3、标点符号（只考虑 , ' " . ;）不用变化。

二、参考算法如下：

复制代码代码如下:

 <?php
 
     function convertLastChar($str) {
 
         $markArr = array(", ", "' ", "\" ", ". ", "; ");
 
         $ret = "";
 
         for ($i = 0, $j = strlen($str); $i < $j; $i++) {
 
             if ($i < $j - 2) {
 
                 $afterStr = $str{$i + 1} . $str{$i + 2};
 
             } else if ($i < $j - 1) {
 
                 $afterStr = $str{$i + 1} . " ";
 
             }
 
             if (in_array($afterStr, $markArr) 
 
                 || $i == $j - 1 
 
                 || $str{$i + 1} == " ") {
 
                 $ret .= strtoupper($str{$i}) === $str{$i} 
 
                     ? strtolower($str{$i}) 
 
                     : strtoupper($str{$i});
 
             } else {
 
                 $ret .= $str{$i};
 
             }
 
         }
 
         return $ret;
 
     }
 
 ?>

测试代码如下：

复制代码代码如下:

<?php

    //test
    $str1 = "A journey of, a thousand 'miles' must can't \"begin\" with a single step.";
    $str2 = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. ";
    $str3 = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a ";
    $str4 = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a B";
    $str5 = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a b'";
    $str6 = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a B\"";

echo "source: " . $str1 . " result: " . convertLastChar($str1) . " ";
 echo "source: " . $str2 . " result: " . convertLastChar($str2) . " ";
 echo "source: " . $str3 . " result: " . convertLastChar($str3) . " ";
 echo "source: " . $str4 . " result: " . convertLastChar($str4) . " ";
 echo "source: " . $str5 . " result: " . convertLastChar($str5) . " ";
 echo "source: " . $str6 . " result: " . convertLastChar($str6) . " ";
?>

运行结果如下：

复制代码代码如下:

source:
A journey of, a thousand 'miles' must can't "begin" with a single step.
result:
a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP.

source:
A journey of, a thousand 'miles' must can't "begin" with a single step. a
result:
a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP. A

source:
A journey of, a thousand 'miles' must can't "begin" with a single step. a B
result:
a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP. A b

source:
A journey of, a thousand 'miles' must can't "begin" with a single step. a b'
result:
a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP. A B'

source:
A journey of, a thousand 'miles' must can't "begin" with a single step. a B"
result:
a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP. A b"

希望本文所述对大家的PHP程序设计有所帮助。

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PHP字符串word末字符实现大小写互换的方法

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