PHP字符串word末字符大小写互换,字符串大小写
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.”
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。
参考算法
<?<span>php </span><span>function</span> convertLastChar(<span>$str</span><span>) { </span><span>$markArr</span> = <span>array</span>(", ", "' ", "\" ", ". ", "; "<span>); </span><span>$ret</span> = ""<span>; </span><span>for</span> (<span>$i</span> = 0, <span>$j</span> = <span>strlen</span>(<span>$str</span>); <span>$i</span> < <span>$j</span>; <span>$i</span>++<span>) { </span><span>if</span> (<span>$i</span> < <span>$j</span> - 2<span>) { </span><span>$afterStr</span> = <span>$str</span>{<span>$i</span> + 1} . <span>$str</span>{<span>$i</span> + 2<span>}; } </span><span>else</span> <span>if</span> (<span>$i</span> < <span>$j</span> - 1<span>) { </span><span>$afterStr</span> = <span>$str</span>{<span>$i</span> + 1} . " "<span>; } </span><span>if</span> (<span>in_array</span>(<span>$afterStr</span>, <span>$markArr</span><span>) </span>|| <span>$i</span> == <span>$j</span> - 1 || <span>$str</span>{<span>$i</span> + 1} == " "<span>) { </span><span>$ret</span> .= <span>strtoupper</span>(<span>$str</span>{<span>$i</span>}) === <span>$str</span>{<span>$i</span><span>} </span>? <span>strtolower</span>(<span>$str</span>{<span>$i</span><span>}) </span>: <span>strtoupper</span>(<span>$str</span>{<span>$i</span><span>}); } </span><span>else</span><span> { </span><span>$ret</span> .= <span>$str</span>{<span>$i</span><span>}; } } </span><span>return</span> <span>$ret</span><span>; } </span>?>
测试
<?<span>php </span><span>//</span><span>test</span> <span>$str1</span> = "A journey of, a thousand 'miles' must can't \"begin\" with a single step."<span>; </span><span>$str2</span> = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. "<span>; </span><span>$str3</span> = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a "<span>; </span><span>$str4</span> = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a B"<span>; </span><span>$str5</span> = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a b'"<span>; </span><span>$str6</span> = "A journey of, a thousand 'miles' must can't \"begin\" with a single step. a B\""<span>; </span><span>echo</span> "source:<br/>" . <span>$str1</span> . "<br/>result:<br/>" . convertLastChar(<span>$str1</span>) . "<br/><br/>"<span>; </span><span>echo</span> "source:<br/>" . <span>$str2</span> . "<br/>result:<br/>" . convertLastChar(<span>$str2</span>) . "<br/><br/>"<span>; </span><span>echo</span> "source:<br/>" . <span>$str3</span> . "<br/>result:<br/>" . convertLastChar(<span>$str3</span>) . "<br/><br/>"<span>; </span><span>echo</span> "source:<br/>" . <span>$str4</span> . "<br/>result:<br/>" . convertLastChar(<span>$str4</span>) . "<br/><br/>"<span>; </span><span>echo</span> "source:<br/>" . <span>$str5</span> . "<br/>result:<br/>" . convertLastChar(<span>$str5</span>) . "<br/><br/>"<span>; </span><span>echo</span> "source:<br/>" . <span>$str6</span> . "<br/>result:<br/>" . convertLastChar(<span>$str6</span>) . "<br/><br/>"<span>; </span>?>
结果:
source:<span> A journey of</span>, a thousand 'miles' must can'<span>t "begin" with a single step. result: a journeY oF, A thousanD </span>'mileS' musT can'T "begiN" witH A singlE steP.<span> source</span>:<span> A journey of</span>, a thousand 'miles' must can'<span>t "begin" with a single step. result: a journeY oF, A thousanD </span>'mileS' musT can'T "begiN" witH A singlE steP.<span> source</span>:<span> A journey of</span>, a thousand 'miles' must can'<span>t "begin" with a single step. a result: a journeY oF, A thousanD </span>'mileS' musT can'T "begiN" witH A singlE steP.<span> A source</span>:<span> A journey of</span>, a thousand 'miles' must can'<span>t "begin" with a single step. a B result: a journeY oF, A thousanD </span>'mileS' musT can'T "begiN" witH A singlE steP.<span> A b source</span>:<span> A journey of</span>, a thousand 'miles' must can't "begin" with a single step. a b'<span> result</span>:<span> a journeY oF</span>, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP. A B'<span> source</span>:<span> A journey of</span>, a thousand 'miles' must can'<span>t "begin" with a single step. a B" result: a journeY oF, A thousanD </span>'mileS' musT can'T "begiN" witH A singlE steP. A b"<span><br /></span>
我们可以看到,是符合预期的。
题目来源
http://blog.sijiaomao.com/?p=98,有改动(增加了can't这种),按改后的规则,原文答案全是错的。

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


熱AI工具

Undresser.AI Undress
人工智慧驅動的應用程序,用於創建逼真的裸體照片

AI Clothes Remover
用於從照片中去除衣服的線上人工智慧工具。

Undress AI Tool
免費脫衣圖片

Clothoff.io
AI脫衣器

AI Hentai Generator
免費產生 AI 無盡。

熱門文章

熱工具

記事本++7.3.1
好用且免費的程式碼編輯器

PhpStorm Mac 版本
最新(2018.2.1 )專業的PHP整合開發工具

SublimeText3 Mac版
神級程式碼編輯軟體(SublimeText3)

EditPlus 中文破解版
體積小,語法高亮,不支援程式碼提示功能

mPDF
mPDF是一個PHP庫,可以從UTF-8編碼的HTML產生PDF檔案。原作者Ian Back編寫mPDF以從他的網站上「即時」輸出PDF文件,並處理不同的語言。與原始腳本如HTML2FPDF相比,它的速度較慢,並且在使用Unicode字體時產生的檔案較大,但支援CSS樣式等,並進行了大量增強。支援幾乎所有語言,包括RTL(阿拉伯語和希伯來語)和CJK(中日韓)。支援嵌套的區塊級元素(如P、DIV),