Use php string functions to encode and decode strings
In the previous article, we learned about the method of converting ASCII character strings and hexadecimal values. If you need it, please read " Get the conversion between ASCII characters and hexadecimal values in minutes. Mutual conversion》. This time we will introduce to you the method of encoding and decoding strings. You can refer to it if you need it.
What we are introducing today is how to use Uuencode to encode and decode strings, so first let’s take a look at what Uuencode is.
Uuencode is the process of converting binary files into text files. Converted files can be transferred via plain text email. The receiver decodes the file, i.e. converts it into an initial binary file.
Let’s first take a look at how to encode a string. After all, it cannot be decoded without encoding.
Let’s look at a small example.
<?php $str = "Hello world!"; echo convert_uuencode($str); ?>
The result is
,2&5L;&\@=V]R;&0A `
We can look at this example. After we use the convert_uuencode function, this string becomes a bunch of strings that we cannot interpret. This is The magic of coding. Let's take a look at the specific usage of this function.
Theconvert_uuencode() function uses the uuencode algorithm to encode a string.
It should be noted that:
This function encodes all strings (including binary) into printable characters to ensure the security of database storage and network transmission. At the same time, the encoded uuencoded data is approximately 35% larger than the original data.
When operating on data, we need to decode it.
Still the same, let’s look at a little chestnut.
The result is
Hello world!
This example is to re-decode the previously encoded "Hello world!". What he uses is the convert_uudecode function. So let's take a look at the convert_uudecode function in detail.
convert_uudecode() function decodes a uuencode-encoded string. After we know what this function does, let's take a look at how to use it.
convert_uudecode(要解码的使用uuencode编码的字符串)
That’s all. If you want to know anything else, you can click this. → →php video tutorial
The above is the detailed content of Use php string functions to encode and decode strings. For more information, please follow other related articles on the PHP Chinese website!
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