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PHP實戰：PHP字符串word末字符實現大小寫互換的方法

作者：VEPHP   時間 2018-03-05

《PHP實戰：PHP字符串word末字符實現大小寫互換的方法》要點：
本文介紹了PHP實戰：PHP字符串word末字符實現大小寫互換的方法，希望對您有用。如果有疑問，可以聯系我們。

PHP編程本文實例講述了PHP字符串word末字符實現大小寫互換的辦法.分享給大家供大家參考.具體實現辦法如下：

PHP編程一、要求：
給出一個字符串如 “A journey of, a thousand 'miles' must can't \"begin\" with a single step.” ,通過 PHP 程序處理變成 “a journeY oF, A thousanD 'mileS' musT can'T "begiN" witH A singlE steP.”

PHP編程這里需要注意：

PHP編程1、每個單詞最后的字符如果是大寫就變成小寫,如果是小寫就變成大寫.
2、需要考慮類似? can't 這種形式的轉換.
3、標點符號(只考慮 , ' " . ;)不用變化.

PHP編程二、參考算法如下：

代碼如下:
<?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;
??? }
?>

PHP編程測試代碼如下：

代碼如下:
<?php

PHP編程??? //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\"";

PHP編程??? 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/>";
?>

PHP編程運行結果如下：

代碼如下:
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.

PHP編程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.

PHP編程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

PHP編程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

PHP編程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'

PHP編程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"

PHP編程希望本文所述對大家的PHP程序設計有所贊助.

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