PHP字符串word末字符实现大小写互换的方法

yipeiwu_com5年前PHP代码库

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

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.
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。

相关文章

详解PHP中foreach的用法和实例

详解PHP中foreach的用法和实例

在PHP中经常会用到foreach的使用,而要用到foreach,就必须用到数组。因此,在这篇文章中,我们一边讲数组,一边讲foreach。 foreach有两种语法: 第一种:遍历给...

php cout&amp;lt;&amp;lt;的一点看法

即整数与小数的位数之和不应该超过6位,如果小数部分过长,那么系统将按四舍五入法来近似成6位,如果整数部分过长,那么也近似成为6位例如: cout<<123.4567 结果是1...

PHP5 面向对象程序设计

PHP5有一个单重继承的,限制访问的,可以重载的对象模型. 本章稍后会详细讨论的”继承”,包含类间的父-子关系. 另外,PHP支持对属性和方法的限制性访问. ...

PHP 输出缓存详解

输出控制函数不对使用 header() 或 setcookie(), 发送的文件头信息产生影响,只对那些类似于 echo() 和 PHP 代码的数据块有作用。 我们先举一个简单的例子,让...

php使用simplexml_load_file加载XML文件并显示XML的方法

本文实例讲述了php使用simplexml_load_file加载XML文件并显示XML的方法。分享给大家供大家参考。具体实现方法如下: <?php $xml =...