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：
[U]复制代码[/U] 代码如下:
测试代码如下：
[U]复制代码[/U] 代码如下:
    //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：
[U]复制代码[/U] 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.
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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