将PHP变量序列化，函数原型：
function swoole_serialize::pack(mixed $data, int $flags = 0);$data为要进行序列化的变量，请注意function和resource类型的变量是不支持序列化的$flags是否启用快速模式，swoole_serialize默认会使用静态表保存关联数组的Key，设置此参数为SWOOLE_FAST_PACK后将不再保存数组key- 序列化成功后返回二进制字符串，失败返回
false
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