PHP字符串word末字符大小写互换
发布时间：2020-05-25 03:33:30 所属栏目：PHP 来源：互联网
导读：要求给出一个字符串如 “A journey of, a thousand miles must cant begin with a single step.” ，通过 PHP 程序处理变成 “a journeY oF, A thousanD mileS musT canT 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
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<h1 class="lead">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><span style="color: #0000ff;">function</span> convertLastChar(<span style="color: #800080;">$str</span><span style="color: #000000;">) { </span><span style="color: #800080;">$markArr</span> = <span style="color: #0000ff;">array</span>(",","' ","" ",". ","; "<span style="color: #000000;">); </span><span style="color: #800080;">$ret</span> = ""<span style="color: #000000;">; </span><span style="color: #0000ff;">for</span> (<span style="color: #800080;">$i</span> = 0,<span style="color: #800080;">$j</span> = <span style="color: #008080;">strlen</span>(<span style="color: #800080;">$str</span>); <span style="color: #800080;">$i</span> < <span style="color: #800080;">$j</span>; <span style="color: #800080;">$i</span>++<span style="color: #000000;">) { </span><span style="color: #0000ff;">if</span> (<span style="color: #800080;">$i</span> < <span style="color: #800080;">$j</span> - 2<span style="color: #000000;">) { </span><span style="color: #800080;">$afterStr</span> = <span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span> + 1} . <span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span> + 2<span style="color: #000000;">}; } </span><span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span> (<span style="color: #800080;">$i</span> < <span style="color: #800080;">$j</span> - 1<span style="color: #000000;">) { </span><span style="color: #800080;">$afterStr</span> = <span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span> + 1} . " "<span style="color: #000000;">; } </span><span style="color: #0000ff;">if</span> (<span style="color: #008080;">in_array</span>(<span style="color: #800080;">$afterStr</span>,<span style="color: #800080;">$markArr</span><span style="color: #000000;">) </span>|| <span style="color: #800080;">$i</span> == <span style="color: #800080;">$j</span> - 1 || <span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span> + 1} == " "<span style="color: #000000;">) { </span><span style="color: #800080;">$ret</span> .= <span style="color: #008080;">strtoupper</span>(<span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span>}) === <span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span><span style="color: #000000;">} </span>? <span style="color: #008080;">strtolower</span>(<span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span><span style="color: #000000;">}) </span>: <span style="color: #008080;">strtoupper</span>(<span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span><span style="color: #000000;">}); } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> { </span><span style="color: #800080;">$ret</span> .= <span style="color: #800080;">$str</span>{<span style="color: #800080;">$i</span><span style="color: #000000;">}; } } </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$ret</span><span style="color: #000000;">; }?> 测试</span><span style="color: #008000;">//</span><span style="color: #008000;">test</span> <span style="color: #800080;">$str1</span> = "A journey of,a thousand 'miles' must can't "begin" with a single step."<span style="color: #000000;">; </span><span style="color: #800080;">$str2</span> = "A journey of,a thousand 'miles' must can't "begin" with a single step. "<span style="color: #000000;">; </span><span style="color: #800080;">$str3</span> = "A journey of,a thousand 'miles' must can't "begin" with a single step. a "<span style="color: #000000;">; </span><span style="color: #800080;">$str4</span> = "A journey of,a thousand 'miles' must can't "begin" with a single step. a B"<span style="color: #000000;">; </span><span style="color: #800080;">$str5</span> = "A journey of,a thousand 'miles' must can't "begin" with a single step. a b'"<span style="color: #000000;">; </span><span style="color: #800080;">$str6</span> = "A journey of,a thousand 'miles' must can't "begin" with a single step. a B""<span style="color: #000000;">; </span><span style="color: #0000ff;">echo</span> "source:<br/>" . <span style="color: #800080;">$str1</span> . "<br/>result:<br/>" . convertLastChar(<span style="color: #800080;">$str1</span>) . "<br/><br/>"<span style="color: #000000;">; </span><span style="color: #0000ff;">echo</span> "source:<br/>" . <span style="color: #800080;">$str2</span> . "<br/>result:<br/>" . convertLastChar(<span style="color: #800080;">$str2</span>) . "<br/><br/>"<span style="color: #000000;">; </span><span style="color: #0000ff;">echo</span> "source:<br/>" . <span style="color: #800080;">$str3</span> . "<br/>result:<br/>" . convertLastChar(<span style="color: #800080;">$str3</span>) . "<br/><br/>"<span style="color: #000000;">; </span><span style="color: #0000ff;">echo</span> "source:<br/>" . <span style="color: #800080;">$str4</span> . "<br/>result:<br/>" . convertLastChar(<span style="color: #800080;">$str4</span>) . "<br/><br/>"<span style="color: #000000;">; </span><span style="color: #0000ff;">echo</span> "source:<br/>" . <span style="color: #800080;">$str5</span> . "<br/>result:<br/>" . convertLastChar(<span style="color: #800080;">$str5</span>) . "<br/><br/>"<span style="color: #000000;">; </span><span style="color: #0000ff;">echo</span> "source:<br/>" . <span style="color: #800080;">$str6</span> . "<br/>result:<br/>" . convertLastChar(<span style="color: #800080;">$str6</span>) . "<br/><br/>"<span style="color: #000000;">;?> 结果： source:,a thousand 'miles' must can''mileS' musT can'T "begiN" witH A singlE steP.source:<span style="color: #000000;">A journey of,a thousand 'miles' must can'<span style="color: #000000;">t "begin" with a single step. result: a journeY oF,A thousanD 'mileS' musT can'T "begiN" witH A singlE steP.<span style="color: #000000;"> （编辑：安卓应用网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |