Как реализовать многопоточность для запроса таблицы в цикле в php?

// запрос, чтобы получить всех пользователей из одной таблицы в одном процессе, и это не должно занять более 30 секунд. Я также использую запросы внутри цикла для получения дополнительных данных о пользователях из разных таблиц.

for($shard_id = $start_index; $shard_id <= $end_index; $shard_id++) {
list($db, $sharded_table) = DbConfig::getInstance()
->getConnectionByShardId($shard_id, $shard_table);
$query = "SELECT user_id,login_id,
first_name, middle_name, last_name, gender,
title,profile_image_url,
registered_user_type,properties
FROM $sharded_table WHERE $where_clause";
$st = $db->prepare($query);
$ret = $st->execute();
$data = $st->fetchAll(PDO::FETCH_ASSOC);
foreach($data as $d){
$rawData[] = $d;
}
}// now i want to iterate each user to get additional properties from different tables containing user Ids
foreach($dataSet as $user){
$temp = array();
$properties = json_decode($user['properties'], true);
$temp['first_name'] = CommonUtil::fetch($user,'first_name','');
$temp['middle_name'] = CommonUtil::fetch($user, 'middle_name', '');
$temp['last_name'] = CommonUtil::fetch($user, 'last_name', '');

$temp['login_id'] = CommonUtil::fetch($user,'login_id','');
$temp['user_id'] = $user['user_id'];
$temp['enroll_grade'] = isset($properties['enroll_grade']) && !empty($properties['enroll_grade']) ? $properties['enroll_grade'] : "-";
$temp['session'] = isset`enter code here`($properties['session']) && !empty($properties['session']) ? $properties['session'] : "2012-2013";
$temp['admission_session'] = isset($properties['admission_session']) && !empty($properties['admission_session']) ? $properties['admission_session'] : "2012-2013";
$userRelationShip =getUserRelationships($user['user_id']);
if(!empty($userRelationShip)){
$userRelationShips[]=$user['user_id'];
}
$temp['user_relationship']=json_encode($userRelationShip);
$userProperties=getUserProperties($user['user_id']);
$temp['user_relationship']=json_encode($userProperties);
$userTemp[]=$temp;
}

// весь процесс занимает много времени для подготовки целых данных. намеревается вставить его в mongoDb, чтобы ускорить выполнение

CREATE TABLE `user_profiles` (
`user_id` bigint(20) unsigned NOT NULL,
`first_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL COMMENT 'first name',
`middle_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL COMMENT 'middle name',
`last_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL COMMENT 'last name',
`login_id` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL COMMENT 'globally unique email address or name',
`password_hash` varchar(255) NOT NULL COMMENT 'encrypted password',
`gender` enum('male','female') DEFAULT NULL COMMENT 'gender of the user (male or female)',
`title` enum('mr','ms','mrs','dr') DEFAULT NULL COMMENT 'title of the user (mr, ms, mrs, dr etc)',
`dob` date DEFAULT NULL COMMENT 'Date of Birth',
`secret_code` varchar(6) NOT NULL COMMENT 'secret code used to connect users',
`default_calendar_id` bigint(20) unsigned DEFAULT NULL COMMENT 'default calendar id',
`default_folder_id` bigint(20) unsigned DEFAULT NULL COMMENT 'default folder id',
`default_album_id` bigint(20) unsigned DEFAULT NULL COMMENT 'default album id',
`profile_album_id` bigint(20) unsigned DEFAULT NULL COMMENT 'profile album id',
`profile_photo_id` bigint(20) unsigned DEFAULT NULL COMMENT 'profile photo id as stored in the profile album',
`profile_image_url` varchar(1024) DEFAULT NULL COMMENT 'user profile image url',
`registered_user_type` enum('teacher','parent','student') DEFAULT NULL COMMENT 'registered user type as',
`referrer_user_id` bigint(20) unsigned DEFAULT NULL COMMENT 'user who referred the current user to BY',
`notification_preference` varchar(2048) DEFAULT NULL COMMENT 'notification preference, JSON array of various notifications that the current user is configured to be notified',
`privacy_preference` varchar(2048) DEFAULT NULL COMMENT 'privacy preference, JSON array of various privacy preferences that the current user has configured',
`properties` varchar(8192) DEFAULT NULL COMMENT 'user specific properties, JSON name-value pairs used to manage user experience etc',
`app_properties` varchar(8192) DEFAULT NULL COMMENT 'application user properties',
`phone_info` varchar(2048) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL COMMENT 'phone information JSON array of (number, provider, activation_code, verified_ts). The first number is primary contact.',
`phone_info_updated_ts` timestamp NULL DEFAULT NULL COMMENT 'last phone info updated timestamp',
`notification_preference_updated_ts` timestamp NULL DEFAULT NULL COMMENT 'last notification preference updated timestamp',
`privacy_preference_updated_ts` timestamp NULL DEFAULT NULL COMMENT 'last privacy preference updated timestamp',
`password_updated_ts` timestamp NULL DEFAULT NULL COMMENT 'last password updated timestamp',
`profile_updated_ts` timestamp NULL DEFAULT NULL COMMENT 'last profile updated timestamp',
`secret_code_updated_ts` timestamp NULL DEFAULT NULL COMMENT 'last secret code updated timestamp',
`status` varchar(25) NOT NULL DEFAULT 'pending' COMMENT 'user status - ''pending'',''active'',''deleted''',
`created_ts` timestamp NULL DEFAULT NULL COMMENT 'created timestamp of the user',
`approved_ts` timestamp NULL DEFAULT NULL COMMENT 'approved timestamp of the user',
`updated_ts` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT 'row updated timestamp',
`school_id` bigint(20) unsigned DEFAULT NULL COMMENT 'School Id for the relavent user',
`organization_id` bigint(20) unsigned DEFAULT NULL COMMENT 'Organization Id for the relavent school',
PRIMARY KEY (`user_id`),
KEY `status_index` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='a BY user profile' |