What should I do if the php json format cannot be displayed?

PHP is a widely used programming language, especially in web development. Processing JSON format data is also one of its essential functions. However, sometimes PHP has incorrect formatting problems when processing JSON data, resulting in incorrect display. Common causes and solutions are introduced below.

1. Encoding issues

Data in JSON format must be UTF-8 encoded to be correctly parsed and displayed. If the data itself uses other encoding formats, garbled characters will appear and cannot be formatted and displayed normally. Therefore, when processing JSON data, be sure to ensure that the encoding format of the original data is correct.

Solution: In PHP code, you can modify the encoding format by setting header information, for example:

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

2. Lack of JSON extension support

PHP has a built-in JSON extension for processing data in JSON format. However, in some PHP versions, this extension may not be enabled, and incorrect formatting may occur when processing JSON data.

Solution: In the php.ini file, search for the json extension and enable it:

extension=json.so

3. The JSON data format is not standardized

When processing JSON data, if the format of the data itself is not standardized, such as grammatical errors or missing names, attributes, etc., the data will not be displayed and formatted correctly.

Solution: You can use an online JSON formatting tool to format the data and correct errors, for example:

• https://jsonformatter.curiousconcept.com/
• https://www.json.cn/

At the same time, you can also use the json_last_error() function in PHP to detect error information during the JSON parsing process.

4. Space and newline character issues

When PHP processes JSON data, invisible characters such as spaces and newline characters will cause abnormal formatting, so when writing PHP code When using, care should be taken to avoid the appearance of these invisible characters.

Solution: You can use the trim() function in PHP to remove spaces and newlines at both ends of the text string:

json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
$json_str = trim($json_str);

In short, when processing JSON data, you need to pay special attention to the above common problems , and when writing code, the code should be standardized and readable to avoid these problems.

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