The following functions will check for and return valid JSON. Generally, json_last_error is best used to return the last error 
(if any) occurred during the last JSON encoding/decoding. The json_last_error function returns an integer but should be checked by way of the following constants:
JSON Error Codes. Source: PHP Manual.
The following will decode JSON and return either the resulting array or false (if the JSON returned an error).
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function beliefmedia_check_json($json) { $result = json_decode($json, true); return (json_last_error() === JSON_ERROR_NONE) ? $result : false; } |
For debugging purposes, it’s handy to know the precise error causing grief.
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/* Check Valid JSON Data http://www.beliefmedia.com/code/php-snippets/check-valid-json */ function beliefmedia_json_validate($string) { /* Check is_string and not empty */ if ( (empty($string)) || (!is_string($string)) ) return false; /* Decode the JSON data */ $result = json_decode($string); /* Switch and check for possible JSON errors */ switch (json_last_error()) { case JSON_ERROR_NONE: $error = ''; // JSON is valid // No error has occurred break; case JSON_ERROR_DEPTH: $error = 'The maximum stack depth has been exceeded.'; break; case JSON_ERROR_STATE_MISMATCH: $error = 'Invalid or malformed JSON.'; break; case JSON_ERROR_CTRL_CHAR: $error = 'Control character error, possibly incorrectly encoded.'; break; case JSON_ERROR_SYNTAX: $error = 'Syntax error, malformed JSON.'; break; // PHP >= 5.3.3 case JSON_ERROR_UTF8: $error = 'Malformed UTF-8 characters, possibly incorrectly encoded.'; break; // PHP >= 5.5.0 case JSON_ERROR_RECURSION: $error = 'One or more recursive references in the value to be encoded.'; break; // PHP >= 5.5.0 case JSON_ERROR_INF_OR_NAN: $error = 'One or more NAN or INF values in the value to be encoded.'; break; case JSON_ERROR_UNSUPPORTED_TYPE: $error = 'A value of a type that cannot be encoded was given.'; break; default: $error = 'Unknown JSON error occured.'; break; } if ($error !== '') { // Throw the Exception or exit exit($error); } /* JSON OK */ return $result; } |
Source: Stackoverflow/Madan Sapkota.
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