How PHP determines whether it is in JSON format

This article mainly introduces PHP to determine whether the JSON format method, the need for friends can refer to the

The first thing to remember is that Json_encode returns a string, and Json_decode returns an object-judging data that is not in JSON format: The code is: function Is_not_json ($str) {return Is_null (Json_d Ecode ($STR));  To determine that the data is valid JSON data: (PHP version is greater than 5.3) the code is as follows: function Is_json ($string) {www.jb51.net json_decode ($string); Return (json_last_error () = = Json_error_none); The Json_last_error () function returns errors that occur during data codec Note: JSON codec operation string must be UTF8 example code as follows:/** * Parse the JSON string * @param type $json _STR * return type */function Analyjson ($json _str) {$json _str = str_replace (' \ \ ', ', $json _str); $out _arr = Array (); PREG_MATC H ('/{.*}/', $json _str, $out _arr); if (!empty ($out _arr)) {$result = Json_decode ($out _arr[0], TRUE);} else {return FALSE;} return $result; Returns False if it is not JSON