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PHP字符串如何实现word末字符实现大小写互换

时间:2020-10-17 10:02:44 php语言 我要投稿

PHP字符串如何实现word末字符实现大小写互换

  PHP字符串如何实现word末字符实现大小写互换?希望下面的'内容对你有所帮助,更多详情请关注应届毕业生考试网。

  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:

  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:

  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:

  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"

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