Insert 0. OK depuis mysql. KO depuis php

INSERT INTO t ( a , b , c ) VALUES ( 98 , 'f' , 0 )

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

CREATE TABLE `t` (
  `id` int(6) NOT NULL,
  `a` int(6) NOT NULL,
  `b` varchar(20) NOT NULL,
  `c` int(2) DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;


ALTER TABLE ``
  ADD PRIMARY KEY (`id`),
  ADD KEY `id` (`id`);

ALTER TABLE `t`
  MODIFY `id` int(6) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=278;
COMMIT;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;