All garbled codes in php get are solved

As a popular programming language, PHP is widely used in web development. In PHP development, GET request is a very common method, but sometimes the problem of garbled parsing of GET request parameters occurs, causing the program to fail to run normally. Today we will take a closer look at how to solve the problem of garbled parsing of GET request parameters in PHP.

1. GET request parameter encoding method

Before understanding the solution, let’s first understand the encoding method of GET request parameter. There are two encoding methods for GET request parameters: URL encoding and UTF-8 encoding.

1. URL encoding

URL encoding is a method of converting specific characters into %xx format, where xx is a hexadecimal number. The URL encoding table is as follows:

For example, if you want to URL-encode the string "haha", the result is "haha".

2. UTF-8 encoding

UTF-8 encoding is a variable-length character encoding method for Unicode characters. In UTF-8 encoding, all ASCII characters are 1 byte, while non-ASCII characters are multiple bytes. For example, the UTF-8 encoding of the character "haha" is "\xE5\x93\x88\xE5\x93\x88".

2. The problem of garbled characters in GET request parameter parsing

In PHP, when we pass Chinese characters in GET request parameters, garbled characters may occur. This is caused by PHP not correctly identifying the encoding method when parsing the GET request parameters. There are two common situations where GET parameter parsing is garbled:

1. The parameters sent by the client are encoded in URL encoding, but the server does not correctly parse the URL encoding, resulting in garbled characters.

For example, when the client request parameter is: ?name=haha, when $_GET['name'] is used to obtain the value in PHP, the result may be garbled.

2. The parameters sent by the client are encoded in UTF-8 encoding, but the server does not correctly parse the UTF-8 encoding, resulting in garbled characters.

For example, when the client request parameter is: ?name=haha, when $_GET['name'] is used to obtain the value in PHP, the result may be garbled. Because the client uses UTF-8 encoding to encode Chinese characters, and the server does not correctly parse the UTF-8 encoding method.

3. Solution

In response to the above two situations, we can use the following two methods to solve the problem of garbled parsing of GET request parameters in PHP.

1. URL decoding

When the parameters sent by the client are encoded in URL encoding, we can URL decode the parameters on the server side and then proceed. deal with. Use the PHP built-in function urldecode() method to decode the URL-encoded string and restore the special characters to their original appearance. For example:

$name = urldecode($_GET['name']);

2. Set encoding format

When the parameters sent by the client are encoded in UTF-8 encoding, we need to set the encoding format on the server side must be UTF-8 to correctly parse Chinese characters.

In PHP, you can use the header() function to set response header information, including encoding format. For example:

header('Content-type:text/html;charset=utf-8');

The above code sets the page encoding format to UTF-8, which can solve many garbled code problems caused by encoding problems.

When using the above method, we need to choose a reasonable solution based on the encoding method of the request parameters. This can ensure that there will be no garbled characters when parsing GET request parameters.

4. Summary

Parsing garbled characters in GET request parameters is a common problem in PHP development, but as long as you master the corresponding solutions, you can easily solve this problem. When using GET requests, you need to pay attention to the choice of request parameter encoding method, and decode or set the encoding format in time to avoid garbled characters.

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