How to determine whether the data is json in php

php method to determine whether the data is json: 1. Create a PHP sample file; 2. Use the "function analyzeJson($json_str) {...}" method to determine whether the data is json.

The operating environment of this article: windows7 system, PHP version 7.4, DELL G3 computer

How does php determine whether the data is json?

php method to determine whether it is in json format

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How does PHP determine whether the data is json?

First of all, remember that json_encode returns a string, and json_decode returns an object.

Determine if the data is not in JSON format:

The code is as follows:

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

Judge that the data is legal 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 the error that occurred during the data encoding and decoding process

Note: The string operated by json encoding and decoding must be UTF8

Example

The code is as follows:

/** * 解析json串 * @param type $json_str * @return type */ function analyJson($json_str) { $json_str = str_replace('＼＼', '', $json_str); $out_arr = array(); preg_match('/{.*}/', $json_str, $out_arr); if (!empty($out_arr)) { $result = json_decode($out_arr[0], TRUE); } else { return FALSE; } return $result; }

If it is not json, return false

Recommended learning: "PHP Video Tutorial》

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