(PHP 5 >= 5.5.0, PHP 7)
json_last_error_msg — Returns the error string of the last json_encode() or json_decode() call
json_last_error_msg ( ) : string
Returns the error string of the last json_encode() or json_decode() call, which did not specify JSON_THROW_ON_ERROR.
This function has no parameters.
Returns the error message on success, or "No error" if no error has occurred.
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https://www.php.net/manual/en/function.json-last-error-msg.php