如何使用PHP编码字符串里面的序列号吗？

How to encode strings inside serial number using PHP?

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你决定亲自试一试：选择一个替换表并用它来编码字符串。

You decided to try it out: you chose some specific substitution table and used it to encrypt some strings.

youdao

行4编码字符串Doublesecretprobation并使用Base64将加密了的这个字符串转变为可打印的字符，以便于用电子邮件等程序传输。

Line 4 encodes the string Double secret probation and USES Base64 to turn the encrypted string into printable characters that can easily be transmitted over E-mail, say.

youdao

escape和unescape方法能够帮助你编码和解码字符串。

The escape and unescape functions let you encode and decode strings.

youdao

字符字符串的长度取决于用于编码字符的字符编码方式(ASCII、EBCDIC和Unicode)。

The length of the character string is dependent on the character encoding (ASCII, EBCDIC, and Unicode) that is used to encode the character.

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给定一个经过编码的字符串，返回其解码字符串。

Given an encoded string, return it's decoded string.

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问题中的所有字符串(编码与解码字符串都是)只包含大写英文字母('A '- 'Z ')。

All strings in this problem (both encrypted and decrypted ones) will consist of only uppercase English letters (' a '-' Z ').

youdao

问题中的所有字符串(编码与解码字符串都是)只包含大写英文字母('A '- 'Z ')。

All strings in this problem (both encrypted and decrypted ones) will consist of only uppercase English letters (' a '-' Z ').

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