Ok, so thanks to Pablo Jiménez, that was quick.
Pdo's buffer was indeed too small, by doing so i was able to retrieve my data.
$pdo = new PDO(
$dsn,
$username,
$password,
array(PDO::MYSQL_ATTR_MAX_BUFFER_SIZE => 2097152)
);
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…