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在现代Web开发中仍然重要,尤其在内容管理和电子商务平台。1)PHP拥有丰富的生态系统和强大框架支持,如Laravel和Symfony。2)性能优化可通过OPcache和Nginx实现。3)PHP8.0引入JIT编译器,提升性能。4)云原生应用通过Docker和Kubernetes部署,提高灵活性和可扩展性。

PHP适合web开发,特别是在快速开发和处理动态内容方面表现出色,但不擅长数据科学和企业级应用。与Python相比,PHP在web开发中更具优势,但在数据科学领域不如Python;与Java相比,PHP在企业级应用中表现较差,但在web开发中更灵活;与JavaScript相比,PHP在后端开发中更简洁,但在前端开发中不如JavaScript。

PHP和Python各有优势,适合不同场景。1.PHP适用于web开发,提供内置web服务器和丰富函数库。2.Python适合数据科学和机器学习,语法简洁且有强大标准库。选择时应根据项目需求决定。

PHP是一种广泛应用于服务器端的脚本语言,特别适合web开发。1.PHP可以嵌入HTML,处理HTTP请求和响应,支持多种数据库。2.PHP用于生成动态网页内容,处理表单数据,访问数据库等,具有强大的社区支持和开源资源。3.PHP是解释型语言,执行过程包括词法分析、语法分析、编译和执行。4.PHP可以与MySQL结合用于用户注册系统等高级应用。5.调试PHP时,可使用error_reporting()和var_dump()等函数。6.优化PHP代码可通过缓存机制、优化数据库查询和使用内置函数。7

PHP成为许多网站首选技术栈的原因包括其易用性、强大社区支持和广泛应用。1)易于学习和使用,适合初学者。2)拥有庞大的开发者社区,资源丰富。3)广泛应用于WordPress、Drupal等平台。4)与Web服务器紧密集成,简化开发部署。

PHP在现代编程中仍然是一个强大且广泛使用的工具,尤其在web开发领域。1)PHP易用且与数据库集成无缝,是许多开发者的首选。2)它支持动态内容生成和面向对象编程,适合快速创建和维护网站。3)PHP的性能可以通过缓存和优化数据库查询来提升,其广泛的社区和丰富生态系统使其在当今技术栈中仍具重要地位。

在PHP中,弱引用是通过WeakReference类实现的,不会阻止垃圾回收器回收对象。弱引用适用于缓存系统和事件监听器等场景,需注意其不能保证对象存活,且垃圾回收可能延迟。

\_\_invoke方法允许对象像函数一样被调用。1.定义\_\_invoke方法使对象可被调用。2.使用$obj(...)语法时,PHP会执行\_\_invoke方法。3.适用于日志记录和计算器等场景,提高代码灵活性和可读性。


热AI工具

Undresser.AI Undress
人工智能驱动的应用程序,用于创建逼真的裸体照片

AI Clothes Remover
用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool
免费脱衣服图片

Clothoff.io
AI脱衣机

AI Hentai Generator
免费生成ai无尽的。

热门文章

热工具

安全考试浏览器
Safe Exam Browser是一个安全的浏览器环境,用于安全地进行在线考试。该软件将任何计算机变成一个安全的工作站。它控制对任何实用工具的访问,并防止学生使用未经授权的资源。

螳螂BT
Mantis是一个易于部署的基于Web的缺陷跟踪工具,用于帮助产品缺陷跟踪。它需要PHP、MySQL和一个Web服务器。请查看我们的演示和托管服务。

适用于 Eclipse 的 SAP NetWeaver 服务器适配器
将Eclipse与SAP NetWeaver应用服务器集成。

SublimeText3 英文版
推荐:为Win版本,支持代码提示!

SublimeText3 Mac版
神级代码编辑软件(SublimeText3)