PHP字符串word末字符实现大小写互换的方法

测试代码如下： 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： 代码如下: