How to solve the problem of garbled url request parameters received by PHP

With the development of the Internet, the difficulty of website development is also increasing, and PHP, as a very commonly used language, is used by more and more developers. However, in PHP development, sometimes we encounter some problems, such as garbled characters when receiving URL request parameters. So how to solve this problem? Next, let us analyze it step by step.

First of all, we need to understand some common URL encoding methods. Common encoding methods include URL encoding and base64 encoding. Among them, URL encoding mainly converts certain characters into the form of %xx to facilitate transmission in the http protocol. Base64 encoding is to encode the original text data and convert it into another form under certain rules, which can be used for the transmission of text, pictures and other data in the network.

So, why do garbled characters appear when receiving URL request parameters? In fact, this is because in the URL transmission, encoding methods such as Chinese are stored in a certain encoding form, and PHP's urldecode function can only decode the application/x-www-form-urlencoded encoding form. For other encoding forms It cannot be decoded, resulting in garbled characters.

To solve this problem, we need to use the two extensions mbstring and iconv in php. The mbstring extension is mainly used to process multi-byte characters and can support character encodings in multiple languages; while the iconv extension is mainly used for character set conversion. These two extensions can be used together to help us solve the problem of garbled URL request parameters.

Now, let’s look at a specific example for a better understanding.

Suppose we have the following url request: https://www.example.com/index.php?name=test&age=18

Among them, the value of name is "test", using The encoding method is utf-8 encoding. If $_GET[‘name’] is used directly to obtain the value of the name parameter, garbled characters will appear. At this time, we can use the following code to decode:

$name = $_GET['name'];
$name = urldecode($name);
$name = iconv(' utf-8', 'gbk', $name);
$name = mb_convert_encoding($name, 'utf-8', 'gbk');

The first line of code is to get name The value of the parameter. The second line of code is to url decode the value of the name parameter and decode the test into Chinese "test". The third line of code is to convert the encoding format from utf-8 to gbk format. The fourth line of code is Convert the encoding format from gbk to utf-8 format and you will end up with the correct Chinese "test".

It should be noted here that if other encoding methods are used, such as gb2312 encoding, then ‘gbk’ in the third line of code needs to be changed to ‘gb2312’, otherwise garbled characters will still appear.

In addition, we can also use a similar method to decode other parameters in the url request. The specific code is as follows:

$age = $_GET['age'];
$age = urldecode($age);
$age = iconv('utf-8', 'gbk' , $age);
$age = mb_convert_encoding($age, 'utf-8', 'gbk');

Similarly, if other encoding methods are used, you need to change the ' gbk' is changed to the corresponding encoding method.

In summary, if we encounter the problem of garbled URL request parameters, we can solve it through the two extensions mbstring and iconv. The specific operation process is: first decode the URL of the parameter value, then convert the encoding format from the request encoding method to the target encoding method, and finally convert the encoding format back to the request encoding method. Due to space limitations, the operation results explained here may not be comprehensive. It is recommended that you refer to more reference materials when using it to ensure correctness and effectiveness.

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