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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