What to do if php obtains garbled json data

With the development of Internet technology, the development of websites and mobile applications is booming year by year, and data interaction has become an important part of it. JSON (JavaScript Object Notation, JavaScript Object Notation) has become one of the more popular data formats in the front-end and back-end interaction process due to its advantages of readability, flexibility, and scalability. When obtaining JSON data in PHP, you may encounter garbled characters. This article will introduce the solution for obtaining garbled JSON data in PHP.

1. UTF-8 encoding

UTF-8 encoding is currently the most widely used character encoding scheme on the Internet, supporting text representation in most languages. There are also corresponding character encoding functions in PHP. For example, the mb_convert_encoding() function can convert a string to a specified encoding. If you want to obtain JSON data from the outside and convert it into a PHP object, you need to convert its content to UTF-8 encoding first.

The following is a sample code to obtain JSON data:

$json_data = file_get_contents('http://example.com/data.json');
$decoded_data = json_decode($json_data);

In this code, we use the file_get_contents() function to obtain the contents of the remote JSON file and store it in the variable $json_data middle. Subsequently, use the json_decode() function to convert the JSON data into a PHP object. However, if the JSON data contains non-UTF-8 encoded characters, garbled characters may occur during the conversion process. We can specify the encoding format before obtaining the data, for example:

$json_data = file_get_contents('http://example.com/data.json');
$json_data = mb_convert_encoding($json_data, 'UTF-8');
$decoded_data = json_decode($json_data);

In the second line of code, we call the mb_convert_encoding() function to convert the data to UTF-8 encoding. In this way, garbled characters caused by inconsistent encoding can be avoided when converting to PHP objects.

2. Set HTTP header

Another way to solve the problem of garbled JSON data obtained by PHP is to specify the character encoding format by setting the HTTP header content. Use the header() function to set HTTP header information, including Content-Type, Content-Disposition, etc. The Content-Type field is used to specify the type of the HTTP message body. Its value format is "primary type/secondary type". During the JSON data transmission process, it should be set to "application/json". At the same time, you must also add character encoding instructions in Content-Type, such as:

header('Content-Type: application/json; charset=utf-8');

In this way, when obtaining JSON data from the server, the encoding will be automatically converted based on the HTTP header information without appearing Garbled code problem.

3. Use the JSON_UNESCAPED_UNICODE option

The JSON_UNESCAPED_UNICODE option can be used in PHP 5.4.0 and above. It is used to convert JSON data without escaping Unicode characters. Processing options. Since in JSON, non-ASCII characters need to be encoded in Unicode, this will cause the data to become verbose and difficult to read. This problem can be avoided if you use the JSON_UNESCAPED_UNICODE option. The sample code is as follows:

$json_data = file_get_contents('http://example.com/data.json');
$decoded_data = json_decode($json_data, false, 512, JSON_UNESCAPED_UNICODE);

In the third line of code, we pass in the JSON_UNESCAPED_UNICODE option in the json_decode() function to indicate that Unicode characters will not be escaped during the conversion process.

Summary

JSON is a lightweight data exchange format. It has the advantages of strong readability and high flexibility. It is widely used in the data interaction process of websites and mobile applications. . However, you may encounter garbled characters when obtaining JSON data in PHP. This problem can be solved in many ways, such as converting character encodings, setting HTTP header information, and using the JSON_UNESCAPED_UNICODE option. The ultimate goal is to convert JSON data into PHP objects correctly and completely to ensure the accuracy and stability of front-end and back-end data interaction.

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