原理：
1.先查詢表中的記錄總數
2.隨機獲取偏移量為0~總記錄數-1
3.查詢時skip偏移量，再獲取1條記錄
因本人測試環境PHP已升級到7.0以上，mongodb擴展使用支持php7.0以上的擴展，很多方法與php5.6不同。因此代碼必須在php7.0以上運行。如果是php5.6環境，需要修改代碼才能運行。
代碼如下：
function.php
<?php// 連接mongodbfunction conn($host, $user, $passwd){ $server = 'mongodb://'.$user.':'.$passwd.'@'.$host; try{ $conn = new MongoDB/Driver/Manager(); } catch (MongoDB/Driver/Exception/ConnectionException $e){ throw new ErrorException('Unable to connect to db server. Error:' . $e->getMessage(), 31); } return $conn;}// 插入數據function add($conn, $dbname, $collname, $data, $index){ // 創建索引 $cmd = array( 'createIndexes' => $collname, 'indexes' => array( array( 'name' => 'index', 'key' => $index, 'ns' => $dbname.'.'.$collname ) ) ); $command = new MongoDB/Driver/Command($cmd); $conn->executeCommand($dbname, $command); // 插入數據 $bulk = new MongoDB/Driver/BulkWrite(); $inserted = 0; if($data){ foreach($data as $k=>$v){ $bulk->insert($v); } $result = $conn->executeBulkWrite($dbname.'.'.$collname, $bulk); $inserted = $result->getInsertedCount(); } return $inserted;}// 獲取總記錄數function getCount($conn, $dbname, $collname){ $cmd = array( 'count' => $collname, 'query' => array() ); $command = new MongoDB/Driver/Command($cmd); $result = $conn->executeCommand($dbname, $command); $response = current($result->toArray()); if($response->ok==1){ return $response->n; } return 0;}// 隨機獲取一條記錄function randOne($conn, $dbname, $collname){ // 總記錄數 $total = getCount($conn, $dbname, $collname); // 隨機偏移 $skip = mt_rand(0, $total-1); $filter = array(); $options = array('skip'=>$skip, 'limit'=>1); $query = new MongoDB/Driver/Query($filter, $options); $cursor = $conn->executeQuery($dbname.'.'.$collname, $query); $result = array(); if($cursor){ foreach($cursor as $v){ $v = objectToArray($v); unset($v['_id']); $result[] = $v; } } return $result? $result[0] : $result;}// 對象轉為數組function objectToArray($obj){ $arr = is_object($obj) ? get_object_vars($obj) : $obj; if(is_array($arr)){ return array_map(__FUNCTION__, $arr); }else{ return $arr; }}?>demo.php
<?phprequire('function.php');// 連接mongodb$conn = conn('localhost','testdb','root','123456');// 插入50條數據記錄$data = array();// 索引$index = array('user'=>true);for($i=0; $i<50; $i++){ $data[] = array( 'user' => 'test_user_'.str_pad($i, 4, '0', STR_PAD_LEFT) );}$inserted = add($conn, 'testdb', 'user', $data, $index);echo '成功插入'.$inserted.'條測試記錄數<br><br>';// 隨機獲取一條記錄,抽5次echo '隨機獲取一條記錄，抽5次<br>';$result = array();for($i=0; $i<5; $i++){ $result[] = randOne($conn, 'testdb', 'user');}echo '<pre>';print_r($result);echo '</pre>';?>輸出：
成功插入50條測試記錄數隨機獲取一條記錄，抽5次Array( [0] => Array ( [user] => test_user_0017 ) [1] => Array ( [user] => test_user_0026 ) [2] => Array ( [user] => test_user_0004 ) [3] => Array ( [user] => test_user_0043 ) [4] => Array ( [user] => test_user_0023 ))
測試php代碼，首先需要在mongodb創建testdb及創建用戶和執行auth。方法如下：
use testdb
db.createUser( { "user":"root", "pwd":"123456", "roles":[{"role" : "readWrite", "db":"testdb"}] } ) db.auth( { "user":"root", "pwd":"123456" } ) 感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
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