PHP字符串如何实现word末字符实现大小写互换

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　　PHP字符串如何实现word末字符实现大小写互换?希望下面的内容对你有所帮助，更多详情请关注应届毕业生考试网。

　　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：

　　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：

　　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：

　　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"

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