Searching for LONGLONG in php-src:
$datatypes = array(
MYSQLI_TYPE_TINY => "TINY",
MYSQLI_TYPE_SHORT => "SHORT",
MYSQLI_TYPE_LONG => "LONG",
MYSQLI_TYPE_FLOAT => "FLOAT",
MYSQLI_TYPE_DOUBLE => "DOUBLE",
MYSQLI_TYPE_TIMESTAMP => "TIMESTAMP",
MYSQLI_TYPE_LONGLONG => "LONGLONG",
MYSQLI_TYPE_INT24 => "INT24",
MYSQLI_TYPE_DATE => "DATE",
MYSQLI_TYPE_TIME => "TIME",
MYSQLI_TYPE_DATETIME => "DATETIME",
MYSQLI_TYPE_YEAR => "YEAR",
MYSQLI_TYPE_ENUM => "ENUM",
MYSQLI_TYPE_SET => "SET",
MYSQLI_TYPE_TINY_BLOB => "TINYBLOB",
MYSQLI_TYPE_MEDIUM_BLOB => "MEDIUMBLOB",
MYSQLI_TYPE_LONG_BLOB => "LONGBLOB",
MYSQLI_TYPE_BLOB => "BLOB",
MYSQLI_TYPE_VAR_STRING => "VAR_STRING",
MYSQLI_TYPE_STRING => "STRING",
MYSQLI_TYPE_NULL => "NULL",
MYSQLI_TYPE_NEWDATE => "NEWDATE",
MYSQLI_TYPE_INTERVAL => "INTERVAL",
MYSQLI_TYPE_GEOMETRY => "GEOMETRY",
);