How does php determine whether the data is json?

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Php method to determine whether the data is json: 1, create a PHP example file; 2, through the "function analyJson ($json_str) {...}" method to determine whether the data is json.

This article operating environment: windows7 system, PHP7.4 version, DELL G3 computer

How does php tell if the data is json?

The method of judging whether it is in json format by php

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How does php tell if the data is json?

The first thing to remember is that json_encode returns a string and json_decode returns an object

Determine that the data is not in JSON format:

The code is as follows:

Function is_not_json ($str) {return is_null (json_decode ($str));}

Determine that the data is legitimate json data: (PHP version is greater than 5.3)

The code is as follows:

Function is_json ($string) {json_decode ($string); return (json_last_error () = = JSON_ERROR_NONE);}

The json_last_error () function returns errors that occur during data encoding and decoding.

Note: the string operated by json codec must be UTF8.

Examples

The code is as follows:

Return false if it is not json

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