PHP字符串word末字符實現(xiàn)大小寫互換的方法

更新時間：2014年11月10日 09:56:07 投稿：shichen2014

這篇文章主要介紹了PHP字符串word末字符實現(xiàn)大小寫互換的方法,是涉及PHP字符串轉(zhuǎn)換非常實用的技巧,需要的朋友可以參考下

本文實例講述了PHP字符串word末字符實現(xiàn)大小寫互換的方法。分享給大家供大家參考。具體實現(xiàn)方法如下：

一、要求：
給出一個字符串如 “A journey of, a thousand 'miles' must can't \"begin\" with a single step.” ，通過 PHP 程序處理變成 “a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP.”

這里需要注意：

1、每個單詞最后的字符如果是大寫就變成小寫，如果是小寫就變成大寫。
2、需要考慮類似 can't 這種形式的轉(zhuǎn)換。
3、標(biāo)點符號（只考慮 , ' " . ;）不用變化。

二、參考算法如下：

復(fù)制代碼代碼如下:

<?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;

    }

?>

測試代碼如下：

復(fù)制代碼代碼如下:

<?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) . " ";
?>

運行結(jié)果如下：

復(fù)制代碼代碼如下:

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"

希望本文所述對大家的PHP程序設(shè)計有所幫助。

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