(PHP 5 >= 5.5.0, PHP 7, PHP 8)
json_last_error_msg — Returns the error string of the last json_encode() or json_decode() call
Returns the error string of the last json_encode() or json_decode()
call, which did not specify JSON_THROW_ON_ERROR
.
此函数没有参数。
Returns the error message on success, or "No error"
if no
error has occurred.