What to do if php json fails to be converted to array

During the development process using PHP, we often use the two functions json_encode and json_decode to convert data. Among them, json_encode is used to convert arrays or objects into JSON format strings, while json_decode is used to convert JSON format strings into arrays or objects. But in actual development, sometimes we encounter situations where json conversion to array fails.

First of all, we need to understand the format of the json string. JSON strings are composed of a series of key-value pairs. Each key-value pair is separated by commas. The key-value pairs can be any type of data, such as strings, numbers, arrays, objects, etc. JSON strings generally start and end with braces {} or square brackets [].

So, what problems will occur when we use json_decode to convert a JSON string into an array?

1. JSON format error

If the format of the JSON string is incorrect, such as missing commas, mismatched quotes, missing braces, etc., it will cause json_decode to fail to correct it Parsed as an array. At this time, we can check whether the JSON format is correct by using the online JSON format validator to better locate the problem.

2. The conversion function parameters are incorrect

The json_decode function has two parameters: the first parameter is the JSON string we want to convert, and the second parameter is a Boolean Value, indicating whether we want to convert the JSON string to an array or an object. If you do not pass in the second parameter, json_decode will convert it to an object by default. Therefore, we need to ensure that the parameters passed in are correct when using the json_decode function.

3. The converted array exceeds PHP's maximum memory limit

If our JSON data is very large, the converted array may exceed PHP's maximum memory limit. At this time, we need to increase the memory limit of PHP or reduce the size of the JSON data so that the json_decode function can smoothly convert the JSON string into an array.

4. JSON data contains unsupported data types

Only string, number, Boolean, null, array and object types are supported in JSON string. If the JSON data contains other data types, such as resources, closures, object instances, etc., it will not be successfully converted to an array.

To sum up, when encountering a failure to convert json to an array, you need to carefully check whether the format of the JSON string is correct, and ensure that the parameters passed to the json_decode function are correct and do not exceed the maximum memory limit of PHP . In addition, you need to pay attention to whether the JSON data contains unsupported data types. Only after these issues are resolved can we successfully convert JSON string to array.

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