php字符串反轉函數

Given a string and we have to reverse it without using a library function.

給定一個字符串，我們必須不使用庫函數而將其反轉。

Example:

例：

Input: "Hello world!"Output: "!dlrow olleH"Input: "Welcome @ IncludeHelp.Com"Output: "moC.pleHedulcnI @ emocleW"

PHP代碼無需使用庫函數即可反轉字符串 (PHP code to reverse the string without using library function)

<?php //PHP code to reverse the string without //using library function//function definition //it accepts a string and returns the revrse string function reverse_string($text){$rev = ''; //variable to store reverse string$i = 0; //counting length//calculating the length of the string while(isset($text[$i])){$i++;}//accessing the element from the reverse//and, assigning them to the $rev variable for($j = $i - 1; $j >= 0; $j--){$rev .= $text[$j];} //returninig the reversed stringreturn $rev; }//main code i.e. function calling $str = "Hello world!"; $r_str = reverse_string($str); echo "string is: ". $str . "<br/>"; echo "reversed string is: ". $r_str . "<br/>";$str = "Welcome @ IncludeHelp.Com"; $r_str = reverse_string($str); echo "string is: ". $str . "<br/>"; echo "reversed string is: ". $r_str . "<br/>";?>

Output

輸出量

string is: Hello world! reversed string is: !dlrow olleH string is: Welcome @ IncludeHelp.Com reversed string is: moC.pleHedulcnI @ emocleW

Explanation:

說明：

Since we can't use the library function, In the function - we run a for loop to reverse the strings by storing the sequence in reverse order in the variable $rev. An additional while loop is set up to check if the variable $text contains a valid string (i.e. to calculate the length). This is an additional safety check to ensure that the program works even if numbers are put into the function.

由于無法使用庫函數，因此在函數中，我們運行一個for循環，以相反的順序將序列存儲在變量$ rev中，以反轉字符串。 設置了一個附加的while循環，以檢查變量$ text是否包含有效的字符串(即，計算長度)。 這是一項附加的安全檢查，以確保即使在功能中輸入了數字，程序也可以正常運行。

翻譯自: https://www.includehelp.com/php/reverse-a-given-string-without-using-the-library-function.aspx

php字符串反轉函數

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